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A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014

A database of global marine commercial, small-scale, illegal and unreported fisheries catch... www.nature.com/scientificdata OPEN Data Descriptor: A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014 Received: 23 September 2016 Reg A. Watson Accepted: 31 January 2017 Published: 11 April 2017 Global fisheries landings data from a range of public sources was harmonised and mapped to 30-min spatial cells based on the distribution of the reported taxa and the fishing fleets involved. This data was extended to include the associated fishing gear used, as well as estimates of illegal, unregulated and unreported catch (IUU) and discards at sea. Expressed as catch rates, these results also separated small-scale fisheries from other fishing operations. The dataset covers 1950 to 2014 inclusive. Mapped catch allows study of the impacts of fisheries on habitats and fauna, on overlap with the diets of marine birds and mammals, and on the related use of fuels and release of greenhouse gases. The fine-scale spatial data can be aggregated to the exclusive economic zone claims of countries and will allow study of the value of landed marine products to their economies and food security, and to those of their trading partners. Design Type(s) data integration objective � observation design Measurement Type(s) biodiversity assessment objective Technology Type(s) digital curation Factor Type(s) geographic location Earth � ocean biome � North Atlantic Ocean � Northwest Atlantic Ocean Sample Characteristic(s) � Southeast Atlantic Ocean � Mediterranean Sea � Northeast Atlantic Ocean � Southern Ocean � Arctic Ocean Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, Tasmania 7001, Australia. Correspondence and requests for materials should be addressed to R.A.W. (email: rwatson@ecomarres.com). SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 1 | | www.nature.com/sdata/ Background & Summary Fishing operations span the globe and occur in all but the deepest and most remote places in global 1,2 oceans . Fishing remains central to the food security of many countries. It provides much needed protein and income to those with few alternatives . To wealthier nations it is associated with an extremely 4,5 valuable and a highly globalised seafood trade . The world’s oceans hold continued promise to provide a range of vital services, and fishing will remain important. Conflict for coastal land use, pollution and 7 8,9 other increasing population-based demands are compounded by ocean acidification, warming , spread of pests, deoxygenation and toxic algae blooms. Humans need to guard marine resources, and mapping global fisheries is an important element. Fishing effort continues to increase, putting pressure on marine 10,11 resources . Large ocean areas have been set aside from fishing as marine protected areas but placing these also requires knowledge of fishing patterns . Knowing the details of global fishing operations 13,14 remains an important part of ensuring that the ocean’s services and productivity are not misused . Examining the relationship between global fisheries and the marine environment, including its 15 16 wildlife and sensitive habitats is challenging but is necessary before the impact on biodiversity and its values can be estimated . Publically available fisheries records are vague, especially in locating where fishing occurs. Nevertheless, it is vital to map fishing and use all available information to do so. This information includes all public sources covering various spatial scales, and auxiliary data such as the distribution of the reported taxa, and information on the distribution of fishing fleets based on access rights and on their observed behaviour. Datasets have been compiled with increasing skill since 1999 and are renewed as more data become available. The approach here is to use a harmonised global dataset from the best public sources, interpolate missing taxonomic data, then map the records to a grid of 30-min spatial cells so as to remain consistent with all available auxiliary data and to make that dataset publically available (Data Citation 1). Data was sourced from a range of public sources (Fig. 1). These were harmonised into a single global dataset with common coding. For each location and year, the best coverage from the available sources was selected and overlapping data removed. This dataset was filtered to retain only marine animals but excludes amphibians, reptiles, birds and mammals. The records were mapped to candidate cells within a system of nearly 300 k global 30-min spatial cells using information on the reported fished taxon’s distribution, the behaviour and access of the reported fishing fleets and any area description provided. A portion of the reported landings represented by each record of the unmapped global dataset was mapped to each candidate cell following a gradient based on the reported taxon’s expected distribution based on depth, habitat and other requirements. Known quotas imposed on fishing fleets were applied. The result was a mapped dataset of catch rates (tonnes per square km of ocean) for each spatial cell separated by year, fishing nation and fished taxa. This data set was further extended to breakdown the FAO Capture 1950-2014 FishBase FAO SealifeBase ICES 1950-2014 Illegal, Unreported Taxon Taxonomic NAFO Distribution Verification 1960-2014 Discards SEAFO 1975-2014 Global Extrapolation Check Mapping 1950-2014 Apportioning GFCM 1970-2014 Commercial Quotas Taxonomic CECAF Disaggregation 1970-2014 Small-Scale Fleet Fleet Momentum Range Expansion Distribution CCAMLR 1970-2014 SAUP 1950-2010 FAO SAUP Various Reports Figure 1. Flow diagram of data collation and processing. SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 2 | | www.nature.com/sdata/ LSF SSF IUU Discards SAUP FAO ICES NAFO SEAFO GFCM CECAF CCAMLR SAUP 1950 1960 1970 1980 1990 2000 2010 1000 5000 100 2000 10 30 50 100 taxa records Figure 2. Breakdown of database contents. (a) Map of database source coverage used (see Table 1); (b) Total tonnage and breakdown from 1950 to 2014, LSF is large-scale fishing, SSF is small-scale fishing, IUU is illegal and unreported fishing, Discards are rates of discard at sea and SAUP provides a comparison with the global total for on-line country catch reconstructions by SAUP ;(c) Map of number of database records; (d) Number of reported taxa. reported landings by fishing gear type based on associations with year/country/taxa. Following this, the catch rate of illegal and unreported landings was estimated for each data record. An estimate of discards (not necessarily of the reported taxa) is also made. Though much of the input landings would be derived from large-scale fishing operations it was possible to estimate rates from small-scale fishing and adjust catch rates to minimise duplicate reporting. Non-overlapping data sources are selected as input (Fig. 2a). In general, the United Nation’s Food and Agriculture’s (FAO) dataset was the only source that provides global coverage but spatial resolution can be quite coarse. FAO’s various regional bodies provide finer spatial definition for several areas and those were used when available and possible. The breakdown of global tonnage represented by records (Fig. 2b) correlates generally to those developed by reconstructions of individual countries in another global dataset (SAUP) , which uses different methodology. The number of database records varies spatially (Fig. 2c) and was impacted by the diversity and intensity of fishing and the level of management control. The number of different taxa reported also varies and is greater in coastal areas (Fig. 2d). Methods Data sources Input data were collected via the Internet from a range of public sources (Table 1). Each covers a range of years, however, until recently, only capture landings data from FAO provided global coverage. Data sources used here are accessible via the Internet and allow use of their products with suitable requested acknowledgement. Typically the data is released under a create commons licence in which the user agrees to acknowledge the data sources. Governments, which have the obligation to collect and provide their fishery statistics to the international organizations responsible to manage these fishery resources, are required to maintain costly infrastructure to collect and analyse such data. It is common for government bodies with each country to gather statistics, which are provided directly to the agencies sourced here or SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 3 | | tonnes (Million) www.nature.com/sdata/ Data Source Description Link FAO Capture Production 1950–2014 (Release date: March 2016) www.fao.org ICES International Committee for the Exploration of the Sea 1950–2014 www.ices.dk NAFO Northwest Atlantic Fisheries Organisation Catch and Effort 1960–2014 www.nafo.int SEAFO Southeast Atlantic Capture Production 1975–2014 (Release date: June 2016) www.seafo.org GFCM General Fisheries Commission for the Mediterranean Capture production www.gfcm.org 1970–2014 (Release date: April 2016) CECAF Fishery Committee for the Eastern Central Atlantic Capture production http://www.fao.org/fishery/statistics/cecaf-capture-production/2/en 1970–2014 (Release date: May 2016) CCAMLR Commission for the Conservation of Antarctic Marine Living www.ccamlr.org Resources Statistical Bulletin 2016 Vol. 28 1970–2014 SAUP Sea Around Us project—records for FAO area 18 (Arctic) v1 1950 TO 2010 www.seaaroundus.org (extrapolated to 2014) Table 1. Data sources. through in-country expert consultants. Ultimately the provision of the data and the support of international and regional bodies is taxpayer funded but essential. Acknowledgement of original data sources is suggested, however, even these sources are compilations of national and regional datasets with many unnamed, dedicated experts. These national bodies have in turn received much of their information from other groups within their respective jurisdictions including fishing companies and their respective organisations. In many cases the initial reporting may have originated on a compulsory and voluntary basis from individual fishers and their respective logbooks. Thus every year global fisheries statistics are produced there may conservatively be thousands of people involved most of which will receive no recognition. For many aspects of fishing, for any jurisdiction, there is often a choice of data sources. Some like the FAO’s dataset are global landing compilations from national contributions; others like the Regional Fisheries Management Organizations (RFMO) can be more detailed including catch and effort distribution focused on one particular area and vary in their coverage of fished taxa (e.g., ICES, NAFO and some tuna RFMOs). There is, however, no harmonization between many of these more detailed statistics, and thus when not available or not possible due to time or confidentiality constraints, FAO statistics were used for these areas or species as this source typically includes all the landings that RFMOs’ provide. In the case of tuna RFMO data, a decision was taken to use FAO’s tuna statistics, to which tuna RFMOs contribute, but to use the information available from the Atlas of Tuna and Billfish which display tuna and billfishes global catches by gear by 5 × 5 degree resolution (http://www.fao.org/figis/geoserver/ tunaatlas/) to provide information on annual fishing patterns for tuna and billfish. This decision was taken because the tuna RFMO data did not cover all landings by non-industrial means, and typically had missing years in their time series. There were often considerable lags until all bodies provided annual information. This decision will be reviewed before each new data version is produced and efforts to include the more detailed tuna RFMO publically available data will be attempted in future updates. All of these sourced data sets had to be converted to flat files from a variety of formats, and provided with common coding for fishing country, fished taxa and reporting areas. Each global area was represented in any year by the best-input data, and selection was based on the completeness of reporting (details of fished taxa) and the spatial precision provided in the statistical areas used. For example, the ICES source for the northeast Atlantic had better spatial definition with its small statistical areas than did the FAO data for the same ocean area so the former was used. Typically regional bodies provided a finer breakdown than sources covering global fishing. As Fig. 2a indicates, much of the world’s oceans are covered by FAO official reporting only, but it was possible to replace whole ocean areas by more informative data sources in several cases. The harmonized global dataset subsequently mapped used the sources identified in Table 1. Taxa excluded Only taxa with a marine origin were used—though some species occur in marine, estuarine and freshwater environments. Aquaculture production was not used from the sources, only wild capture was included and mapped. Records of shells, coral and similar were not used. Reports of amphibian, reptile, bird or mammal captures were also not used. Correction to reported taxa In situations where the reported taxon was highly aggregated and described in ways like ‘marine fishes’, the record was disaggregated to the compatible breakdown of neighbouring countries with better detail (taxonomic disaggregation). The range of animals reported was checked with known distribution limits and obvious misidentifications were corrected (taxonomic verification). Corrections sometimes required adjusting the taxonomic description to a more general level, for example, from the species to the family level. SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 4 | | www.nature.com/sdata/ Correction to fishing country Unfortunately there is, as yet, little information to guide attempts to reverse the reflagging of fishing vessels. Sometimes when a country that reflags many vessels reports catch which originated in areas that their fleets do not fish and in fact do not have access rights to, it was possible to consult a list of the likely original flag nation and attempt to map the catch record with that nationality. Thus far this can only be attempted with reflagged European vessel based on a single reference . This is still a relatively crude and unsatisfactory process while records of reflagging are kept confidential and appropriate databases to guide the process are very limited. Where possible reflagged fleets are corrected to their likely true identity as this relates to access rights assumed in the mapping process. As most marine resources are in the shallower inshore areas now claimed by coastal countries as their Exclusive Economic Zones (EEZ), the fishing access of fleets is an important part of mapping global fishing and is a major part of the resource management . Auxiliary data Auxiliary data is a term used to describe other factors known about the landings other than the actual weights reported. These include the taxonomic identity of the reported catch. This is usually provided by data sources as the common English name for one or more species. This in turn provides information about the distribution of the taxon and its preferred and required habits. This is essential information for the subsequent mapping process. Distributions of most landed taxa are known and described in a number 19,22 of useful sources including Fishbase http://www.fishbase.org. These distributions are usually associated with marine habitats that can be described by such factors as the presence of macroalgae, coral reefs, seagrasses, seamounts, distance from shore and many others. There are published associations between the catch of marine taxa by countries by year and the fishing 16,23 gears used . The literature and internet were used to create a database that associates up to 5 different types of fishing gear with the capture of each taxon by country and year. Extrapolations were made to 16,23 provide associations with all catch database records and these were used to prorate the mapped landings into catches by each gear type. Fishing fleets also have known behaviours . Some do not leave their national waters, others travel to the waters of other countries to fish, while some fish on the high seas. Databases of fishing arrangements , researched through trade papers and journals, can suggest where fleets access specific taxa in the EEZ claims of other countries. Corrections for fishing fleet range It was important to correct for the offshore limits to fishing fleet operations when assigning catch to spatial cells. It is accepted that the range of fishing fleets have evolved over time based on changes to technology and also the general depletion of stocks closes to harbours and shores. A documented expansion for fishing has been observed and operates in a ratchet-like way generally related to the development of the fishery as characterised by the annual trajectory of reporting landings . This correction was applied independently to each taxa/country combination within each of FAO’s large ocean-scale statistical reporting areas. Typically the assumption used is that when a fishery for a taxon reaches its historical peak in an ocean area, the fleet’s fishing range eclipses the entire distributional range of that taxon. That is the fleet’s fishing range and the taxon’s distributional range overlap. No subsequent contraction of fishing range is used. Mapping The harmonised and verified global dataset of reported landings (1950–2014) prepared as described above was mapped. The spatial disaggregation process chose spatial cells that hosted the reported taxa within the nominated reporting area but were also accessible by fishing fleets of the reporting nation for those taxa in that year. The latter condition is based on known fishing arrangements or derived fishing fleet behaviour (historical observations). Within this collection of candidate spatial fished cells, the reported tonnes were distributed using the gradient of the reported taxa’s habitat requirements and the area of ocean in each cell . Note that 30-min spatial cells are largest at the equator and decrease to the poles, and might lie only partially on ocean areas. The results were catch rates (tonnes per square km of ocean) for each spatial cell for each fishing nation and fished taxa available annually from 1950 to 2014. Association with fishing gears The mapped catch rates were then associated with fishing gears based on reports in the literature and on- 16,23 line. Associations depend on the fished taxon, the fishing country and the year it was fished . This process increases the number of database records as it prorates each record into a number of records for each associated gear. Illegal, unreported, and unreported catch and discard estimates It is important to recognise that not all catch that is landed is reported and would appear in the pubic record, and that many marine animals are collected and subsequently discarded (not landed) and may also not be documented. The reported landings dataset was extended to produce a breakdown of illegal, unreported and discard catch rates by fishing gear type based on ranked associations with year/country/ SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 5 | | www.nature.com/sdata/ 23 26 taxa . Following this, for each record, an estimate of the catch rate of associated IUU was calculated as well as an estimate of discards . IUU were retained catches which for whatever reason were not included in the public record. Discards are those catches which are not retained or landed. Discard catch rates that were estimated were not expected to be the same taxon as the reported landed taxon for each record, but rather would be comprised of a variety of taxa, targeted and non-targeted, many of which would not be represented in the original landings source data. Small-scale fisheries In addition, for each record, there was an estimate of small-scale fishing provided , with the original landing estimate adjusted when reporting may overlap. The portion that was not deemed small-scale is referred to as large-scale (commercial) catch rates. Small-scale fisheries were deemed to occur only in spatial cells that were both within 200 km of shore and with depths of 50 m or less. The reported small-scale catch rates for each country, based on its development status were prorated amongst candidate mapped records. An assumption was made that the degree to which small-scale fishing was fully represented in the original data sources was proportional to the national corruption index, that is, countries with high levels of corruption are unlikely to forward full and complete records to the agencies compiling fisheries statistics and small-scale fisheries would be under-reported. When some or all of the small-scale fishing was deemed as already represented in the landings provided by data sources then the ‘large-scale’ catch rate was prorated accordingly to avoid overlap. Overview The process overall is one where public sources of reported fisheries landings are harmonised to present the best global dataset which is then mapped to spatial cells based on taxonomic and fisheries logistic considerations. This is associated with fishing gears. Following this, IUU and discards are added. Small- scale operations are added and adjustments made for overlaps. Code availability The programmed procedures used to process data were written in Microsoft’s VB.net and employed Microsoft Access and SQL server databases. The distributions of taxa and other supporting auxiliary data are available from a range of sources collated originally by the Sea Around Us project at the University of British Columbia and they can be contacted about availability. Relevant scripts/code used for data assembly and mapping are available as Supplementary Information. Future updates Every year the organisations providing the source data provide updates. Most have a lag of a year or more from current fishing. The current plan is to update the data annually after the release of source updates and to include the best sources of data. Unfortunately it is not possible to know if an agency has altered any of its previous data from it last update. That means that the entire dataset is currently prepared annually though changes to years more than 5-years back or more are unlikely. Data Records Each data record is comprised of 12 descriptive fields, which collectively describe the fishing process associated with the output catch rates (Table 2). These describe the year of fishing, the location by 30-min spatial cell, the fishing country, the reported taxon and the associated fishing gear. For each there is an − 2 estimate in catch rate (tonnes per km ) of catch associated with large-scale, small scale, illegal and unreported, and discards. Text fields within each record describe all codes used. The spatial cells have their central latitude, longitude and enclosed ocean area provided. Countries have their UN English name provided. Each reported taxon has both an accepted scientific and common name provided. Fishing − 2 − 1 gears have descriptive name included. Each record has an estimated catch rate in tonnes km yr for large-scale fishing, small-scale fishing, illegal (and otherwise unreported) fishing and discards at sea. Technical Validation The dataset and its unpublished earlier versions continue to provide a valuable resource for a range of researchers. They are commonly are used to report levels of fishing activity within defined areas such as national EEZ claims or the widely used large marine ecosystems. Some examples are presented here. Figure 3a shows the estimated catch for 2010 to 2014. More productive areas are clearly visible. Similarly it is possible to examine where most discarding at sea is occurring such as for 2000–2004 shown in Fig. 3b. Knowing where fishing is occurring and how the patterns are changing is important to examining possible impacts on vulnerable habitats (coral, seagrass etc.) or on resources used by wildlife like seabirds or marine mammals. The data can help explore where potentially vulnerable groups like sharks and rays (Fig. 3c), or important fisheries like tunas (Fig. 3d) are being taken globally or in any management region. The data was validated and mapped according to rules that dictate that reported taxa must be available at the location and accessible by the fleets of the reporting country in the year fished by the associated fishing gear. As such the mapping is constrained by many supporting databases that are encyclopaedic in scale (for example FishBase http://www.fishbase.org). Though unlikely to capture details available from tracing ship movements by satellite or even logbooks kept by vessels, it was necessary to use a broad, SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 6 | | www.nature.com/sdata/ Name Long name Units of Measurement Description Year Year (Calendar) None Year of fishing (reported) Seq Spatial cell code None Unique spatial 'half-degree' spatial cell in a gird of 259,200 (360 rows × 720 columns) each 0.5 degrees of latitude by 0.5 degrees of longitude. Cell 1 is centered at 90 North and 179.75 West. Numbering is first by row then by column so cell 2 is at 90 N and 179.25 W. Cells numbered from North to South, and within each latitude, from West to East. Centre of each spatial cell is identified by the Lon (Longitude) and Lat (Latitude) fields and the OceanArea field estimates the surface area of ocean within the spatial cell. Lat Latitude of centre of Angular degrees in geographical Centre is.25 degrees from any cell country as these are half degree spatial cell global coordinate system (or 30 min) spatial cells Lon Longitude of centre of Angular degrees in geographical Centre is.25 degrees from any cell border as these are half degree (or 30 min) spatial cells spatial cell global coordinate system OceanArea Area (estimated) of ocean Square kilometres Used to translate catch rates in tonnes per square kilometre of ocean surface in the spatial cell into absolute weights (tonnes) CNumber Country Code None Code for each country/fishing entity—relates to FAO name, relates to CountryName field CountryName Country Name None UN’s English name for reporting/fishing country coded by CNumber field Taxonkey Taxon Code None Code for the reported taxon based on Froese, R., Pauly, D. E., (2006) FishBase. World Wide Web electronic publication.and other sources—relates to TaxonName and CommonName fields TaxonName Scientific Taxonomic None Developed from FishBase and other on-line sources—coded by Taxonkey field Name CommonName Common English None Adopted from FishBase and other on-line sources—coded by Taxonkey field Name for taxon Gear Fishing gear code None Code for the fishing gear used (after von Brandt) see Watson, et al. GearName Fishing gear name None Coded by gear code. LSF_CR Large-scale fishing Tonnes per sq km of Catch rate of reported landings not attributed to small-scale (SSF_CR) fishing catch rate ocean in year SSF_CR Small-scale fisheries Tonnes per sq km of Catch rate of small-scale marine fisheries catches based on reported landings catch rate ocean in year and on estimates in Chuenpagdee et al. , depending on the reporting accuracy assumed for the country some SSF catch rates might have been reported originally combined with large-scale catch rates and the LLS_CR was adjusted accordingly IUU_CR Rate of illegal and otherwise Tonnes per sq km of Catch rate of illegal catch estimated based on Agnew et al. unreported catch ocean in year Discards_CR Rate of associated Tonnes per sq km of Catch rate of discarded marine life estimated based on Kelleher, K. discards at sea ocean in year NOTE: the discards are often not the same taxon as that reported/targeted through fishing so this is only a general estimate with no specific taxonomic identity Table 2. Data field definitions. top-down approach because otherwise a global treatment would not be achievable. Where possible the access of fishing fleets and their fishing behaviour was updated annually (for example with tuna fishing) but often their arrangements are approximated by more static fishing agreements. The distributions of the fished taxa will change with ocean warming and other factors though at broader scales fishing patterns may be slow to change except where thawing icecaps allows new access. Some of the challenges 14,24 have been discussed elsewhere . Usage Notes Most users will find that the complete dataset of nearly 868 million records is quite large to work with. The dataset is available in 5-year blocks starting from 1950. Work with the data has involved either reading flat files or bulk-importing data into a robust database program and ensuring that relevant fields are well indexed. The various descriptive fields will allow useful sub-setting of the data. Spatial resolution is poorest when the source data had vast statistical reporting areas, when fleets roam globally or when the reported fished taxa are widely distributed. In practice these are not a large problem if the results are used in larger spatial aggregations such as large marine ecosystem but use of data from only a small selection of cells (o100) is discouraged. As described, the estimate of discarded catch is unlikely to be the taxon reported in that record. That is, if a record describes the catch rate of a shrimp with associated discards then those discards should not be assumed to be that target species but rather a rather large range of poorly valued marine animals best identified by surveys of the area. The online datasets provided by the Sea Around Us project are prepared in a different manner but historically had some commonality in basic methodology and supporting databases (such as the ranges of fished taxa). Data here is not reconstructed on a national basis, assigned to national or high seas water areas but rather is leveraged from sources provided directly by reporting agencies (Table 1). Both approaches have their merits. Given the large role that public agency data (such as the UN’s FAO capture fishery dataset) play in providing the ‘backbone’ over which datasets with a more restricted but focused approach are added, it is not surprising that the general patterns of landings in time and space are similar. The RAM legacy database provides global insights on global fisheries from the perspective of those fisheries with stock assessments. Assessments tend to be common in developed countries but rare SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 7 | | www.nature.com/sdata/ -2 -1 kg km yr 0.1 1 2 10 50 200 − 2 − 1 Figure 3. Examples of database use with mapped catch rates (kg km yr ). (a) Average annual reported catch rates (including IUU) for 2010–2014; (b) Average annual catch rate of discarded marine products 2000–2004; (c) Average catch rate of sharks and rays 2010–2014; (d) Average catch rate of tunas and billfish 2010–2014. elsewhere. Importantly such databases are essential to make predictions about how exploited stocks are likely to react with future changes, whether due to the environment and through change to the marine environment. References 1. Watson, R. A. et al. Marine foods sourced from farther as their use of global ocean primary production increases. Nature communications 6, 7365 (2015). 2. Watson, R. A. & Morato, T. Fishing down the deep: accounting for within-species changes in depth of fishing. Fisheries Research 140, 63–65 (2013). 3. Srinivasan, U. T. et al. The debt of nations and the distribution of ecological impacts from human activities. Proceedings of the National Academy of Sciences 105, 1768–1773 (2008). 4. Watson, R. A., Green, B. S., Tracey, S., Farmery, A. & Pitcher, T. J. Provenance of global seafood. Fish and Fisheries 17, 585–595 (2016). 5. Gephart, J. A., Rovenskaya, E., Dieckmann, U., Pace, M. L. & Brannstom, A. Vulnerability to shocks in the global seafood trade network. Environmental Research Letters 11, 035008; doi:10.1088/1748-9326/11/3/035008 (2016). 6. Sumaila, U. R. et al. Impact of the Deepwater Horizon well blowout on the Economics of U.S. Gulf fisheries. Canadian Journal Fisheries and Aquatic Sciences 69, 499–510 (2012). 7. Halpern, B. S. et al. A global map of human impact on marine ecosystems. Science 319, 948–952 (2008). 8. Cheung, W. W. L., Watson, R. & Pauly, D. Signature of ocean warming in global fisheries catch. Nature 497, 365–368 (2013). 9. Cheung, W. W. L. et al. Projecting global marine biodiversity impacts under climate change scenarios. Fish and Fisheries 10, 235–251 (2009). 10. Bell, J. D., Watson, R. A. & Ye, Y. Global fishing capacity and fishing effort from 1950–2012. Fish and Fisheries; doi: 10.1111/ faf.12187 (19 September 2016). 11. Watson, R. A. et al. Global marine yield halved as fishing intensity redoubles. Fish and Fisheries 14, 493–503 (2013). 12. Devillers, R. et al. Reinventing residual reserves in the sea: are we favouring ease of establishment over need for protection? Aquatic Conservation 25, 480–504 (2015). 13. Sumaila, U. R. et al. Winners and losers in a world where the high seas is closed to fishing. Nature Scientific Reports 5: 8481; doi: 10.1038/srep08481 (2015). 14. Watson, R., Alder, J., Kitchingman, A. & Pauly, D. Catching some needed attention. Marine Policy 29, 281–284 (2005). SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 8 | | www.nature.com/sdata/ 15. Paleczny, M. et al. in 2nd International Marine Conservation Congress, IMCC2 14-18 May, 2011. Victoria, B.C., Canada. 16. Watson, R., Revenga, C. & Kura, Y. Fishing gear associated with global marine catches. II. Trends in trawling and dredging. Fisheries Research 79, 103–111 (2006). 17. Worm, B. et al. Impacts of biodiversity loss on ocean ecosystem services. Science 314, 787–790 (2006). 18. Pauly, D. & Zeller, D. Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining. Nature communications 7, 10244 (2016). 19. Close, C. et al. Distribution ranges of commercial fishes and invertebrates, Report No. 1198-6727, 27–37 (Fisheries Centre, University of British Columbia, 2006). 20. Parliament, E. Revised Working Document 3 on the Role of Flags of Convenience in the Fisheries Sector 5 (Committee on Fisheries, European Parliament, EU, 2001). 21. Nichols, R., Yamazaki, S., Jennings, S. & Watson, R. A. Fishing access agreements and harvesting decisions of host and distant water fishing nations. Marine Policy 54, 77–85 (2015). 22. Pauly, D. et al. Asymmetry in latitudinal, longitudinal and bathymetric distribution of marine fishes and invertebrates, Report No. 1198-6727, 63–72 (Fisheries Centre, University of British Columbia, 2008). 23. Watson, R., Revenga, C. & Kura, Y. Fishing gear associated with global marine catches: I Database development. Fisheries Research 79, 97–102 (2006). 24. Watson, R., Kitchingman, A., Gelchu, A. & Pauly, D. Mapping global fisheries: sharpening our focus. Fish and Fisheries 5, 168–177 (2004). 25. FAO. FAO’s fisheries agreements register (FARISIS). Committee on Fisheries, 23rd session, Rome, Italy, 15–19 February 1999, (COFI/99/Inf.9E) 4 (Rome, Italy (1998). 26. Agnew, D. J. et al. Estimating the worldwide extent of illegal fishing. PLoS ONE 4, e4570 (2009). 27. Kelleher, K. Discards in the world’s marine fisheries. An update. 131 (FAO, 2005). 28. Chuenpagdee, R., Liguori, L., Palomares, M. L. D. & Pauly, D. Bottom up, global estimates of small-scale marine fisheries catches 105 (University of British Columbia, 2006). 29. Kaufmann, D., Kraay, A. & Mastruzzi, M. The Worldwide Governance Indicators: Methodology and Analytical Issues (World Bank, 2010). 30. Ricard, D., Minto, C., Jensen, O. P. & Baum, J. K. Evaluating the knowledge base and status of commercially exploited marine species with the RAM Legacy Stock Assessment Database. Fish and Fisheries 13, 380–398 (2013). Data Citation 1. Watson, R. A. Institute for Marine and Antarctic Studies, University of Tasmania http://dx.doi.org/10.4226/77/58293083b0515 (2016). Acknowledgements The author acknowledges support from the Australian Research Council (Discovery project DP140101377). Author Contributions R.A.W. compiled the data, created the database version, and wrote the paper. Additional Information Supplementary Information accompanies this paper at http://www.nature.com/sdata Competing interests: The authors declare no competing financial interests. How to cite this article: Watson, R. A. A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014. Sci. Data 4:170039 doi: 10.1038/sdata.2017.39 (2017). Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0 Metadata associated with this Data Descriptor is available at http://www.nature.com/sdata/ and is released under the CC0 waiver to maximize reuse. © The Author(s) 2017 SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 9 | | http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Scientific Data Springer Journals

A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014

Scientific Data , Volume 4 (1) – Apr 11, 2017

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Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
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www.nature.com/scientificdata OPEN Data Descriptor: A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014 Received: 23 September 2016 Reg A. Watson Accepted: 31 January 2017 Published: 11 April 2017 Global fisheries landings data from a range of public sources was harmonised and mapped to 30-min spatial cells based on the distribution of the reported taxa and the fishing fleets involved. This data was extended to include the associated fishing gear used, as well as estimates of illegal, unregulated and unreported catch (IUU) and discards at sea. Expressed as catch rates, these results also separated small-scale fisheries from other fishing operations. The dataset covers 1950 to 2014 inclusive. Mapped catch allows study of the impacts of fisheries on habitats and fauna, on overlap with the diets of marine birds and mammals, and on the related use of fuels and release of greenhouse gases. The fine-scale spatial data can be aggregated to the exclusive economic zone claims of countries and will allow study of the value of landed marine products to their economies and food security, and to those of their trading partners. Design Type(s) data integration objective � observation design Measurement Type(s) biodiversity assessment objective Technology Type(s) digital curation Factor Type(s) geographic location Earth � ocean biome � North Atlantic Ocean � Northwest Atlantic Ocean Sample Characteristic(s) � Southeast Atlantic Ocean � Mediterranean Sea � Northeast Atlantic Ocean � Southern Ocean � Arctic Ocean Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 49, Hobart, Tasmania 7001, Australia. Correspondence and requests for materials should be addressed to R.A.W. (email: rwatson@ecomarres.com). SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 1 | | www.nature.com/sdata/ Background & Summary Fishing operations span the globe and occur in all but the deepest and most remote places in global 1,2 oceans . Fishing remains central to the food security of many countries. It provides much needed protein and income to those with few alternatives . To wealthier nations it is associated with an extremely 4,5 valuable and a highly globalised seafood trade . The world’s oceans hold continued promise to provide a range of vital services, and fishing will remain important. Conflict for coastal land use, pollution and 7 8,9 other increasing population-based demands are compounded by ocean acidification, warming , spread of pests, deoxygenation and toxic algae blooms. Humans need to guard marine resources, and mapping global fisheries is an important element. Fishing effort continues to increase, putting pressure on marine 10,11 resources . Large ocean areas have been set aside from fishing as marine protected areas but placing these also requires knowledge of fishing patterns . Knowing the details of global fishing operations 13,14 remains an important part of ensuring that the ocean’s services and productivity are not misused . Examining the relationship between global fisheries and the marine environment, including its 15 16 wildlife and sensitive habitats is challenging but is necessary before the impact on biodiversity and its values can be estimated . Publically available fisheries records are vague, especially in locating where fishing occurs. Nevertheless, it is vital to map fishing and use all available information to do so. This information includes all public sources covering various spatial scales, and auxiliary data such as the distribution of the reported taxa, and information on the distribution of fishing fleets based on access rights and on their observed behaviour. Datasets have been compiled with increasing skill since 1999 and are renewed as more data become available. The approach here is to use a harmonised global dataset from the best public sources, interpolate missing taxonomic data, then map the records to a grid of 30-min spatial cells so as to remain consistent with all available auxiliary data and to make that dataset publically available (Data Citation 1). Data was sourced from a range of public sources (Fig. 1). These were harmonised into a single global dataset with common coding. For each location and year, the best coverage from the available sources was selected and overlapping data removed. This dataset was filtered to retain only marine animals but excludes amphibians, reptiles, birds and mammals. The records were mapped to candidate cells within a system of nearly 300 k global 30-min spatial cells using information on the reported fished taxon’s distribution, the behaviour and access of the reported fishing fleets and any area description provided. A portion of the reported landings represented by each record of the unmapped global dataset was mapped to each candidate cell following a gradient based on the reported taxon’s expected distribution based on depth, habitat and other requirements. Known quotas imposed on fishing fleets were applied. The result was a mapped dataset of catch rates (tonnes per square km of ocean) for each spatial cell separated by year, fishing nation and fished taxa. This data set was further extended to breakdown the FAO Capture 1950-2014 FishBase FAO SealifeBase ICES 1950-2014 Illegal, Unreported Taxon Taxonomic NAFO Distribution Verification 1960-2014 Discards SEAFO 1975-2014 Global Extrapolation Check Mapping 1950-2014 Apportioning GFCM 1970-2014 Commercial Quotas Taxonomic CECAF Disaggregation 1970-2014 Small-Scale Fleet Fleet Momentum Range Expansion Distribution CCAMLR 1970-2014 SAUP 1950-2010 FAO SAUP Various Reports Figure 1. Flow diagram of data collation and processing. SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 2 | | www.nature.com/sdata/ LSF SSF IUU Discards SAUP FAO ICES NAFO SEAFO GFCM CECAF CCAMLR SAUP 1950 1960 1970 1980 1990 2000 2010 1000 5000 100 2000 10 30 50 100 taxa records Figure 2. Breakdown of database contents. (a) Map of database source coverage used (see Table 1); (b) Total tonnage and breakdown from 1950 to 2014, LSF is large-scale fishing, SSF is small-scale fishing, IUU is illegal and unreported fishing, Discards are rates of discard at sea and SAUP provides a comparison with the global total for on-line country catch reconstructions by SAUP ;(c) Map of number of database records; (d) Number of reported taxa. reported landings by fishing gear type based on associations with year/country/taxa. Following this, the catch rate of illegal and unreported landings was estimated for each data record. An estimate of discards (not necessarily of the reported taxa) is also made. Though much of the input landings would be derived from large-scale fishing operations it was possible to estimate rates from small-scale fishing and adjust catch rates to minimise duplicate reporting. Non-overlapping data sources are selected as input (Fig. 2a). In general, the United Nation’s Food and Agriculture’s (FAO) dataset was the only source that provides global coverage but spatial resolution can be quite coarse. FAO’s various regional bodies provide finer spatial definition for several areas and those were used when available and possible. The breakdown of global tonnage represented by records (Fig. 2b) correlates generally to those developed by reconstructions of individual countries in another global dataset (SAUP) , which uses different methodology. The number of database records varies spatially (Fig. 2c) and was impacted by the diversity and intensity of fishing and the level of management control. The number of different taxa reported also varies and is greater in coastal areas (Fig. 2d). Methods Data sources Input data were collected via the Internet from a range of public sources (Table 1). Each covers a range of years, however, until recently, only capture landings data from FAO provided global coverage. Data sources used here are accessible via the Internet and allow use of their products with suitable requested acknowledgement. Typically the data is released under a create commons licence in which the user agrees to acknowledge the data sources. Governments, which have the obligation to collect and provide their fishery statistics to the international organizations responsible to manage these fishery resources, are required to maintain costly infrastructure to collect and analyse such data. It is common for government bodies with each country to gather statistics, which are provided directly to the agencies sourced here or SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 3 | | tonnes (Million) www.nature.com/sdata/ Data Source Description Link FAO Capture Production 1950–2014 (Release date: March 2016) www.fao.org ICES International Committee for the Exploration of the Sea 1950–2014 www.ices.dk NAFO Northwest Atlantic Fisheries Organisation Catch and Effort 1960–2014 www.nafo.int SEAFO Southeast Atlantic Capture Production 1975–2014 (Release date: June 2016) www.seafo.org GFCM General Fisheries Commission for the Mediterranean Capture production www.gfcm.org 1970–2014 (Release date: April 2016) CECAF Fishery Committee for the Eastern Central Atlantic Capture production http://www.fao.org/fishery/statistics/cecaf-capture-production/2/en 1970–2014 (Release date: May 2016) CCAMLR Commission for the Conservation of Antarctic Marine Living www.ccamlr.org Resources Statistical Bulletin 2016 Vol. 28 1970–2014 SAUP Sea Around Us project—records for FAO area 18 (Arctic) v1 1950 TO 2010 www.seaaroundus.org (extrapolated to 2014) Table 1. Data sources. through in-country expert consultants. Ultimately the provision of the data and the support of international and regional bodies is taxpayer funded but essential. Acknowledgement of original data sources is suggested, however, even these sources are compilations of national and regional datasets with many unnamed, dedicated experts. These national bodies have in turn received much of their information from other groups within their respective jurisdictions including fishing companies and their respective organisations. In many cases the initial reporting may have originated on a compulsory and voluntary basis from individual fishers and their respective logbooks. Thus every year global fisheries statistics are produced there may conservatively be thousands of people involved most of which will receive no recognition. For many aspects of fishing, for any jurisdiction, there is often a choice of data sources. Some like the FAO’s dataset are global landing compilations from national contributions; others like the Regional Fisheries Management Organizations (RFMO) can be more detailed including catch and effort distribution focused on one particular area and vary in their coverage of fished taxa (e.g., ICES, NAFO and some tuna RFMOs). There is, however, no harmonization between many of these more detailed statistics, and thus when not available or not possible due to time or confidentiality constraints, FAO statistics were used for these areas or species as this source typically includes all the landings that RFMOs’ provide. In the case of tuna RFMO data, a decision was taken to use FAO’s tuna statistics, to which tuna RFMOs contribute, but to use the information available from the Atlas of Tuna and Billfish which display tuna and billfishes global catches by gear by 5 × 5 degree resolution (http://www.fao.org/figis/geoserver/ tunaatlas/) to provide information on annual fishing patterns for tuna and billfish. This decision was taken because the tuna RFMO data did not cover all landings by non-industrial means, and typically had missing years in their time series. There were often considerable lags until all bodies provided annual information. This decision will be reviewed before each new data version is produced and efforts to include the more detailed tuna RFMO publically available data will be attempted in future updates. All of these sourced data sets had to be converted to flat files from a variety of formats, and provided with common coding for fishing country, fished taxa and reporting areas. Each global area was represented in any year by the best-input data, and selection was based on the completeness of reporting (details of fished taxa) and the spatial precision provided in the statistical areas used. For example, the ICES source for the northeast Atlantic had better spatial definition with its small statistical areas than did the FAO data for the same ocean area so the former was used. Typically regional bodies provided a finer breakdown than sources covering global fishing. As Fig. 2a indicates, much of the world’s oceans are covered by FAO official reporting only, but it was possible to replace whole ocean areas by more informative data sources in several cases. The harmonized global dataset subsequently mapped used the sources identified in Table 1. Taxa excluded Only taxa with a marine origin were used—though some species occur in marine, estuarine and freshwater environments. Aquaculture production was not used from the sources, only wild capture was included and mapped. Records of shells, coral and similar were not used. Reports of amphibian, reptile, bird or mammal captures were also not used. Correction to reported taxa In situations where the reported taxon was highly aggregated and described in ways like ‘marine fishes’, the record was disaggregated to the compatible breakdown of neighbouring countries with better detail (taxonomic disaggregation). The range of animals reported was checked with known distribution limits and obvious misidentifications were corrected (taxonomic verification). Corrections sometimes required adjusting the taxonomic description to a more general level, for example, from the species to the family level. SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 4 | | www.nature.com/sdata/ Correction to fishing country Unfortunately there is, as yet, little information to guide attempts to reverse the reflagging of fishing vessels. Sometimes when a country that reflags many vessels reports catch which originated in areas that their fleets do not fish and in fact do not have access rights to, it was possible to consult a list of the likely original flag nation and attempt to map the catch record with that nationality. Thus far this can only be attempted with reflagged European vessel based on a single reference . This is still a relatively crude and unsatisfactory process while records of reflagging are kept confidential and appropriate databases to guide the process are very limited. Where possible reflagged fleets are corrected to their likely true identity as this relates to access rights assumed in the mapping process. As most marine resources are in the shallower inshore areas now claimed by coastal countries as their Exclusive Economic Zones (EEZ), the fishing access of fleets is an important part of mapping global fishing and is a major part of the resource management . Auxiliary data Auxiliary data is a term used to describe other factors known about the landings other than the actual weights reported. These include the taxonomic identity of the reported catch. This is usually provided by data sources as the common English name for one or more species. This in turn provides information about the distribution of the taxon and its preferred and required habits. This is essential information for the subsequent mapping process. Distributions of most landed taxa are known and described in a number 19,22 of useful sources including Fishbase http://www.fishbase.org. These distributions are usually associated with marine habitats that can be described by such factors as the presence of macroalgae, coral reefs, seagrasses, seamounts, distance from shore and many others. There are published associations between the catch of marine taxa by countries by year and the fishing 16,23 gears used . The literature and internet were used to create a database that associates up to 5 different types of fishing gear with the capture of each taxon by country and year. Extrapolations were made to 16,23 provide associations with all catch database records and these were used to prorate the mapped landings into catches by each gear type. Fishing fleets also have known behaviours . Some do not leave their national waters, others travel to the waters of other countries to fish, while some fish on the high seas. Databases of fishing arrangements , researched through trade papers and journals, can suggest where fleets access specific taxa in the EEZ claims of other countries. Corrections for fishing fleet range It was important to correct for the offshore limits to fishing fleet operations when assigning catch to spatial cells. It is accepted that the range of fishing fleets have evolved over time based on changes to technology and also the general depletion of stocks closes to harbours and shores. A documented expansion for fishing has been observed and operates in a ratchet-like way generally related to the development of the fishery as characterised by the annual trajectory of reporting landings . This correction was applied independently to each taxa/country combination within each of FAO’s large ocean-scale statistical reporting areas. Typically the assumption used is that when a fishery for a taxon reaches its historical peak in an ocean area, the fleet’s fishing range eclipses the entire distributional range of that taxon. That is the fleet’s fishing range and the taxon’s distributional range overlap. No subsequent contraction of fishing range is used. Mapping The harmonised and verified global dataset of reported landings (1950–2014) prepared as described above was mapped. The spatial disaggregation process chose spatial cells that hosted the reported taxa within the nominated reporting area but were also accessible by fishing fleets of the reporting nation for those taxa in that year. The latter condition is based on known fishing arrangements or derived fishing fleet behaviour (historical observations). Within this collection of candidate spatial fished cells, the reported tonnes were distributed using the gradient of the reported taxa’s habitat requirements and the area of ocean in each cell . Note that 30-min spatial cells are largest at the equator and decrease to the poles, and might lie only partially on ocean areas. The results were catch rates (tonnes per square km of ocean) for each spatial cell for each fishing nation and fished taxa available annually from 1950 to 2014. Association with fishing gears The mapped catch rates were then associated with fishing gears based on reports in the literature and on- 16,23 line. Associations depend on the fished taxon, the fishing country and the year it was fished . This process increases the number of database records as it prorates each record into a number of records for each associated gear. Illegal, unreported, and unreported catch and discard estimates It is important to recognise that not all catch that is landed is reported and would appear in the pubic record, and that many marine animals are collected and subsequently discarded (not landed) and may also not be documented. The reported landings dataset was extended to produce a breakdown of illegal, unreported and discard catch rates by fishing gear type based on ranked associations with year/country/ SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 5 | | www.nature.com/sdata/ 23 26 taxa . Following this, for each record, an estimate of the catch rate of associated IUU was calculated as well as an estimate of discards . IUU were retained catches which for whatever reason were not included in the public record. Discards are those catches which are not retained or landed. Discard catch rates that were estimated were not expected to be the same taxon as the reported landed taxon for each record, but rather would be comprised of a variety of taxa, targeted and non-targeted, many of which would not be represented in the original landings source data. Small-scale fisheries In addition, for each record, there was an estimate of small-scale fishing provided , with the original landing estimate adjusted when reporting may overlap. The portion that was not deemed small-scale is referred to as large-scale (commercial) catch rates. Small-scale fisheries were deemed to occur only in spatial cells that were both within 200 km of shore and with depths of 50 m or less. The reported small-scale catch rates for each country, based on its development status were prorated amongst candidate mapped records. An assumption was made that the degree to which small-scale fishing was fully represented in the original data sources was proportional to the national corruption index, that is, countries with high levels of corruption are unlikely to forward full and complete records to the agencies compiling fisheries statistics and small-scale fisheries would be under-reported. When some or all of the small-scale fishing was deemed as already represented in the landings provided by data sources then the ‘large-scale’ catch rate was prorated accordingly to avoid overlap. Overview The process overall is one where public sources of reported fisheries landings are harmonised to present the best global dataset which is then mapped to spatial cells based on taxonomic and fisheries logistic considerations. This is associated with fishing gears. Following this, IUU and discards are added. Small- scale operations are added and adjustments made for overlaps. Code availability The programmed procedures used to process data were written in Microsoft’s VB.net and employed Microsoft Access and SQL server databases. The distributions of taxa and other supporting auxiliary data are available from a range of sources collated originally by the Sea Around Us project at the University of British Columbia and they can be contacted about availability. Relevant scripts/code used for data assembly and mapping are available as Supplementary Information. Future updates Every year the organisations providing the source data provide updates. Most have a lag of a year or more from current fishing. The current plan is to update the data annually after the release of source updates and to include the best sources of data. Unfortunately it is not possible to know if an agency has altered any of its previous data from it last update. That means that the entire dataset is currently prepared annually though changes to years more than 5-years back or more are unlikely. Data Records Each data record is comprised of 12 descriptive fields, which collectively describe the fishing process associated with the output catch rates (Table 2). These describe the year of fishing, the location by 30-min spatial cell, the fishing country, the reported taxon and the associated fishing gear. For each there is an − 2 estimate in catch rate (tonnes per km ) of catch associated with large-scale, small scale, illegal and unreported, and discards. Text fields within each record describe all codes used. The spatial cells have their central latitude, longitude and enclosed ocean area provided. Countries have their UN English name provided. Each reported taxon has both an accepted scientific and common name provided. Fishing − 2 − 1 gears have descriptive name included. Each record has an estimated catch rate in tonnes km yr for large-scale fishing, small-scale fishing, illegal (and otherwise unreported) fishing and discards at sea. Technical Validation The dataset and its unpublished earlier versions continue to provide a valuable resource for a range of researchers. They are commonly are used to report levels of fishing activity within defined areas such as national EEZ claims or the widely used large marine ecosystems. Some examples are presented here. Figure 3a shows the estimated catch for 2010 to 2014. More productive areas are clearly visible. Similarly it is possible to examine where most discarding at sea is occurring such as for 2000–2004 shown in Fig. 3b. Knowing where fishing is occurring and how the patterns are changing is important to examining possible impacts on vulnerable habitats (coral, seagrass etc.) or on resources used by wildlife like seabirds or marine mammals. The data can help explore where potentially vulnerable groups like sharks and rays (Fig. 3c), or important fisheries like tunas (Fig. 3d) are being taken globally or in any management region. The data was validated and mapped according to rules that dictate that reported taxa must be available at the location and accessible by the fleets of the reporting country in the year fished by the associated fishing gear. As such the mapping is constrained by many supporting databases that are encyclopaedic in scale (for example FishBase http://www.fishbase.org). Though unlikely to capture details available from tracing ship movements by satellite or even logbooks kept by vessels, it was necessary to use a broad, SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 6 | | www.nature.com/sdata/ Name Long name Units of Measurement Description Year Year (Calendar) None Year of fishing (reported) Seq Spatial cell code None Unique spatial 'half-degree' spatial cell in a gird of 259,200 (360 rows × 720 columns) each 0.5 degrees of latitude by 0.5 degrees of longitude. Cell 1 is centered at 90 North and 179.75 West. Numbering is first by row then by column so cell 2 is at 90 N and 179.25 W. Cells numbered from North to South, and within each latitude, from West to East. Centre of each spatial cell is identified by the Lon (Longitude) and Lat (Latitude) fields and the OceanArea field estimates the surface area of ocean within the spatial cell. Lat Latitude of centre of Angular degrees in geographical Centre is.25 degrees from any cell country as these are half degree spatial cell global coordinate system (or 30 min) spatial cells Lon Longitude of centre of Angular degrees in geographical Centre is.25 degrees from any cell border as these are half degree (or 30 min) spatial cells spatial cell global coordinate system OceanArea Area (estimated) of ocean Square kilometres Used to translate catch rates in tonnes per square kilometre of ocean surface in the spatial cell into absolute weights (tonnes) CNumber Country Code None Code for each country/fishing entity—relates to FAO name, relates to CountryName field CountryName Country Name None UN’s English name for reporting/fishing country coded by CNumber field Taxonkey Taxon Code None Code for the reported taxon based on Froese, R., Pauly, D. E., (2006) FishBase. World Wide Web electronic publication.and other sources—relates to TaxonName and CommonName fields TaxonName Scientific Taxonomic None Developed from FishBase and other on-line sources—coded by Taxonkey field Name CommonName Common English None Adopted from FishBase and other on-line sources—coded by Taxonkey field Name for taxon Gear Fishing gear code None Code for the fishing gear used (after von Brandt) see Watson, et al. GearName Fishing gear name None Coded by gear code. LSF_CR Large-scale fishing Tonnes per sq km of Catch rate of reported landings not attributed to small-scale (SSF_CR) fishing catch rate ocean in year SSF_CR Small-scale fisheries Tonnes per sq km of Catch rate of small-scale marine fisheries catches based on reported landings catch rate ocean in year and on estimates in Chuenpagdee et al. , depending on the reporting accuracy assumed for the country some SSF catch rates might have been reported originally combined with large-scale catch rates and the LLS_CR was adjusted accordingly IUU_CR Rate of illegal and otherwise Tonnes per sq km of Catch rate of illegal catch estimated based on Agnew et al. unreported catch ocean in year Discards_CR Rate of associated Tonnes per sq km of Catch rate of discarded marine life estimated based on Kelleher, K. discards at sea ocean in year NOTE: the discards are often not the same taxon as that reported/targeted through fishing so this is only a general estimate with no specific taxonomic identity Table 2. Data field definitions. top-down approach because otherwise a global treatment would not be achievable. Where possible the access of fishing fleets and their fishing behaviour was updated annually (for example with tuna fishing) but often their arrangements are approximated by more static fishing agreements. The distributions of the fished taxa will change with ocean warming and other factors though at broader scales fishing patterns may be slow to change except where thawing icecaps allows new access. Some of the challenges 14,24 have been discussed elsewhere . Usage Notes Most users will find that the complete dataset of nearly 868 million records is quite large to work with. The dataset is available in 5-year blocks starting from 1950. Work with the data has involved either reading flat files or bulk-importing data into a robust database program and ensuring that relevant fields are well indexed. The various descriptive fields will allow useful sub-setting of the data. Spatial resolution is poorest when the source data had vast statistical reporting areas, when fleets roam globally or when the reported fished taxa are widely distributed. In practice these are not a large problem if the results are used in larger spatial aggregations such as large marine ecosystem but use of data from only a small selection of cells (o100) is discouraged. As described, the estimate of discarded catch is unlikely to be the taxon reported in that record. That is, if a record describes the catch rate of a shrimp with associated discards then those discards should not be assumed to be that target species but rather a rather large range of poorly valued marine animals best identified by surveys of the area. The online datasets provided by the Sea Around Us project are prepared in a different manner but historically had some commonality in basic methodology and supporting databases (such as the ranges of fished taxa). Data here is not reconstructed on a national basis, assigned to national or high seas water areas but rather is leveraged from sources provided directly by reporting agencies (Table 1). Both approaches have their merits. Given the large role that public agency data (such as the UN’s FAO capture fishery dataset) play in providing the ‘backbone’ over which datasets with a more restricted but focused approach are added, it is not surprising that the general patterns of landings in time and space are similar. The RAM legacy database provides global insights on global fisheries from the perspective of those fisheries with stock assessments. Assessments tend to be common in developed countries but rare SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 7 | | www.nature.com/sdata/ -2 -1 kg km yr 0.1 1 2 10 50 200 − 2 − 1 Figure 3. Examples of database use with mapped catch rates (kg km yr ). (a) Average annual reported catch rates (including IUU) for 2010–2014; (b) Average annual catch rate of discarded marine products 2000–2004; (c) Average catch rate of sharks and rays 2010–2014; (d) Average catch rate of tunas and billfish 2010–2014. elsewhere. Importantly such databases are essential to make predictions about how exploited stocks are likely to react with future changes, whether due to the environment and through change to the marine environment. References 1. Watson, R. A. et al. Marine foods sourced from farther as their use of global ocean primary production increases. Nature communications 6, 7365 (2015). 2. Watson, R. A. & Morato, T. Fishing down the deep: accounting for within-species changes in depth of fishing. Fisheries Research 140, 63–65 (2013). 3. Srinivasan, U. T. et al. The debt of nations and the distribution of ecological impacts from human activities. Proceedings of the National Academy of Sciences 105, 1768–1773 (2008). 4. Watson, R. A., Green, B. S., Tracey, S., Farmery, A. & Pitcher, T. J. Provenance of global seafood. Fish and Fisheries 17, 585–595 (2016). 5. Gephart, J. A., Rovenskaya, E., Dieckmann, U., Pace, M. L. & Brannstom, A. Vulnerability to shocks in the global seafood trade network. Environmental Research Letters 11, 035008; doi:10.1088/1748-9326/11/3/035008 (2016). 6. Sumaila, U. R. et al. Impact of the Deepwater Horizon well blowout on the Economics of U.S. Gulf fisheries. Canadian Journal Fisheries and Aquatic Sciences 69, 499–510 (2012). 7. Halpern, B. S. et al. A global map of human impact on marine ecosystems. Science 319, 948–952 (2008). 8. Cheung, W. W. L., Watson, R. & Pauly, D. Signature of ocean warming in global fisheries catch. Nature 497, 365–368 (2013). 9. Cheung, W. W. L. et al. Projecting global marine biodiversity impacts under climate change scenarios. Fish and Fisheries 10, 235–251 (2009). 10. Bell, J. D., Watson, R. A. & Ye, Y. Global fishing capacity and fishing effort from 1950–2012. Fish and Fisheries; doi: 10.1111/ faf.12187 (19 September 2016). 11. Watson, R. A. et al. Global marine yield halved as fishing intensity redoubles. Fish and Fisheries 14, 493–503 (2013). 12. Devillers, R. et al. Reinventing residual reserves in the sea: are we favouring ease of establishment over need for protection? Aquatic Conservation 25, 480–504 (2015). 13. Sumaila, U. R. et al. Winners and losers in a world where the high seas is closed to fishing. Nature Scientific Reports 5: 8481; doi: 10.1038/srep08481 (2015). 14. Watson, R., Alder, J., Kitchingman, A. & Pauly, D. Catching some needed attention. Marine Policy 29, 281–284 (2005). SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 8 | | www.nature.com/sdata/ 15. Paleczny, M. et al. in 2nd International Marine Conservation Congress, IMCC2 14-18 May, 2011. Victoria, B.C., Canada. 16. Watson, R., Revenga, C. & Kura, Y. Fishing gear associated with global marine catches. II. Trends in trawling and dredging. Fisheries Research 79, 103–111 (2006). 17. Worm, B. et al. Impacts of biodiversity loss on ocean ecosystem services. Science 314, 787–790 (2006). 18. Pauly, D. & Zeller, D. Catch reconstructions reveal that global marine fisheries catches are higher than reported and declining. Nature communications 7, 10244 (2016). 19. Close, C. et al. Distribution ranges of commercial fishes and invertebrates, Report No. 1198-6727, 27–37 (Fisheries Centre, University of British Columbia, 2006). 20. Parliament, E. Revised Working Document 3 on the Role of Flags of Convenience in the Fisheries Sector 5 (Committee on Fisheries, European Parliament, EU, 2001). 21. Nichols, R., Yamazaki, S., Jennings, S. & Watson, R. A. Fishing access agreements and harvesting decisions of host and distant water fishing nations. Marine Policy 54, 77–85 (2015). 22. Pauly, D. et al. Asymmetry in latitudinal, longitudinal and bathymetric distribution of marine fishes and invertebrates, Report No. 1198-6727, 63–72 (Fisheries Centre, University of British Columbia, 2008). 23. Watson, R., Revenga, C. & Kura, Y. Fishing gear associated with global marine catches: I Database development. Fisheries Research 79, 97–102 (2006). 24. Watson, R., Kitchingman, A., Gelchu, A. & Pauly, D. Mapping global fisheries: sharpening our focus. Fish and Fisheries 5, 168–177 (2004). 25. FAO. FAO’s fisheries agreements register (FARISIS). Committee on Fisheries, 23rd session, Rome, Italy, 15–19 February 1999, (COFI/99/Inf.9E) 4 (Rome, Italy (1998). 26. Agnew, D. J. et al. Estimating the worldwide extent of illegal fishing. PLoS ONE 4, e4570 (2009). 27. Kelleher, K. Discards in the world’s marine fisheries. An update. 131 (FAO, 2005). 28. Chuenpagdee, R., Liguori, L., Palomares, M. L. D. & Pauly, D. Bottom up, global estimates of small-scale marine fisheries catches 105 (University of British Columbia, 2006). 29. Kaufmann, D., Kraay, A. & Mastruzzi, M. The Worldwide Governance Indicators: Methodology and Analytical Issues (World Bank, 2010). 30. Ricard, D., Minto, C., Jensen, O. P. & Baum, J. K. Evaluating the knowledge base and status of commercially exploited marine species with the RAM Legacy Stock Assessment Database. Fish and Fisheries 13, 380–398 (2013). Data Citation 1. Watson, R. A. Institute for Marine and Antarctic Studies, University of Tasmania http://dx.doi.org/10.4226/77/58293083b0515 (2016). Acknowledgements The author acknowledges support from the Australian Research Council (Discovery project DP140101377). Author Contributions R.A.W. compiled the data, created the database version, and wrote the paper. Additional Information Supplementary Information accompanies this paper at http://www.nature.com/sdata Competing interests: The authors declare no competing financial interests. How to cite this article: Watson, R. A. A database of global marine commercial, small-scale, illegal and unreported fisheries catch 1950–2014. Sci. Data 4:170039 doi: 10.1038/sdata.2017.39 (2017). Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0 Metadata associated with this Data Descriptor is available at http://www.nature.com/sdata/ and is released under the CC0 waiver to maximize reuse. © The Author(s) 2017 SCIENTIFIC DATA 4:170039 DOI: 10.1038/sdata.2017.39 9 | |

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