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Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas

Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific... Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alien species, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa, how effectively these are removed by conventional cleansing techniques, and whether those that remain after cleansing survive intra-regional translocation. Over 40 invertebrate species belonging to 11 major taxa were found living on farmed oysters. Both mean abundance (A) and biomass (B) of invertebrate taxa associated with uncleansed oysters (A: 79.48, SD 233.10; B: 0.034 g, SD 0.314) were greatly reduced following cleansing (A: 2.30, SD 7.65; B: 0.0003 g, SD 0.002), but small numbers survived even after translocation (A: 1.87, SD 7.43; B: 0.006 g, SD 0.020). We examined the effectiveness of exposing oysters to either fresh water or heated seawater as a more thorough cleansing regimen to prevent the translocation of such taxa. Oysters survived soaking in fresh water (0% mortality after 18 h) better than immersion in heated seawater (26.7% mortality after 40 s), but associated organisms were more effectively eliminated by the latter treatment. However, as some taxa survived both types of treatment, translocation of oysters would still pose some bio-security risks, even following such treatments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Journal of Marine Science Taylor & Francis

Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas

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Intra-regional translocations of epifaunal and infaunal species associated with cultured Pacific oysters Crassostrea gigas

Abstract

Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alien species, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa, how effectively these are removed by conventional cleansing techniques, and whether those that remain after cleansing survive intra-regional translocation. Over 40 invertebrate species...
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Publisher
Taylor & Francis
Copyright
Copyright NISC (Pty) Ltd
ISSN
1814-2338
eISSN
1814-232X
DOI
10.2989/1814232X.2012.673293
Publisher site
See Article on Publisher Site

Abstract

Farmed oysters host a diverse community of epifaunal and infaunal fouling taxa, including alien species, and these are easily translocated in the course of commercial oyster trade. We document the diversity and densities of fouling taxa associated with farmed oysters Crassostrea gigas in South Africa, how effectively these are removed by conventional cleansing techniques, and whether those that remain after cleansing survive intra-regional translocation. Over 40 invertebrate species belonging to 11 major taxa were found living on farmed oysters. Both mean abundance (A) and biomass (B) of invertebrate taxa associated with uncleansed oysters (A: 79.48, SD 233.10; B: 0.034 g, SD 0.314) were greatly reduced following cleansing (A: 2.30, SD 7.65; B: 0.0003 g, SD 0.002), but small numbers survived even after translocation (A: 1.87, SD 7.43; B: 0.006 g, SD 0.020). We examined the effectiveness of exposing oysters to either fresh water or heated seawater as a more thorough cleansing regimen to prevent the translocation of such taxa. Oysters survived soaking in fresh water (0% mortality after 18 h) better than immersion in heated seawater (26.7% mortality after 40 s), but associated organisms were more effectively eliminated by the latter treatment. However, as some taxa survived both types of treatment, translocation of oysters would still pose some bio-security risks, even following such treatments.

Journal

African Journal of Marine Science – Taylor & Francis

Published: Aug 1, 2012

Keywords: alien species; biosecurity; cleansing procedures; epifauna; infauna; oyster; South Africa

References

  • Growth of the Pacific oyster Crassostrea gigas (Mollusca: Bivalvia) in the Blue Hole (Swartkops Estuary), Port Elizabeth, South Africa