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Microcystin-LR equivalent concentrations in fish tissue during a postbloom Microcystis exposure in Loskop Dam, South Africa

Microcystin-LR equivalent concentrations in fish tissue during a postbloom Microcystis exposure... The effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used to confirm the presence of microcystin-LR equivalent in the water and to determine the microcystin (MCYST) concentration in the liver and muscle of fish. The lowest concentration of extracellular MCYST-LR equivalent was recorded in the lacustrine zone, where no cyanobacterial cells were observed, while the highest concentration (3.25 µg l−1), 3.25 higher than World Health Organization standard, was observed in the riverine zone. Extremely high MCYST-LR equivalent concentrations of 1.72 µg MCYST-LReq kg−1 in the liver and 0.19 µg kg−1 in muscles of Labeo rosae, and 2.14 µg MCYST-LReq kg−1 in the liver and 0.17 µg kg−1 in muscles of Oreochromis mossambicus, indicate that the consumption of sufficient fish biomass might cause severe adverse effects in humans. Microscopic analyses of the stomach content of both fish species revealed low numbers of cyanobacterial Microcystis aeruginosa cells in comparison to other phytoplankton. The extracellular MCYST-LR equivalent of the decomposing bloom may have played a major role in the high levels observed in the livers of the two fish species. These findings are important for all downstream water users. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Journal of Aquatic Science Taylor & Francis

Microcystin-LR equivalent concentrations in fish tissue during a postbloom Microcystis exposure in Loskop Dam, South Africa

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Publisher
Taylor & Francis
Copyright
Copyright © NISC (Pty) Ltd
ISSN
1727-9364
eISSN
1608-5914
DOI
10.2989/16085914.2014.973830
Publisher site
See Article on Publisher Site

Abstract

The effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used to confirm the presence of microcystin-LR equivalent in the water and to determine the microcystin (MCYST) concentration in the liver and muscle of fish. The lowest concentration of extracellular MCYST-LR equivalent was recorded in the lacustrine zone, where no cyanobacterial cells were observed, while the highest concentration (3.25 µg l−1), 3.25 higher than World Health Organization standard, was observed in the riverine zone. Extremely high MCYST-LR equivalent concentrations of 1.72 µg MCYST-LReq kg−1 in the liver and 0.19 µg kg−1 in muscles of Labeo rosae, and 2.14 µg MCYST-LReq kg−1 in the liver and 0.17 µg kg−1 in muscles of Oreochromis mossambicus, indicate that the consumption of sufficient fish biomass might cause severe adverse effects in humans. Microscopic analyses of the stomach content of both fish species revealed low numbers of cyanobacterial Microcystis aeruginosa cells in comparison to other phytoplankton. The extracellular MCYST-LR equivalent of the decomposing bloom may have played a major role in the high levels observed in the livers of the two fish species. These findings are important for all downstream water users.

Journal

African Journal of Aquatic Science – Taylor & Francis

Published: Oct 2, 2014

Keywords: cyanobacteria; indigenous fish species; Labeo rosae; liver; muscle tissue; Oreochromis mossambicus

References

  • Bloom dynamics of toxic Alexandrium species in the north-eastern United States
  • Dreissenid mussels increase exposure of benthic and pelagic organisms to toxic microcystins
  • Diversity of planktonic foraminifera in deep sea sediments
  • First identification of the hepatotoxic microcystins in the serum of a chronically exposed human population, together with indication of hepatocellular damage
  • Foraging strategies and growth inhibition in five daphnids feeding on mixtures of a toxic cyanobacterium and green alga
  • Olifants Water Management Area: internal strategic perspective
  • Toxicity of the blue-green algae (cyanobacterium) Microcystis aeruginosa in drinking water to growing pigs, as an animal model for human injury and risk assessment
  • Tumour promotion by cyanobacterial toxins
  • Health risk assessment of cyanobacterial (blue-green algal) toxins in drinking water
  • Eutrophication. Parameters and trophic state indices in 30 Swedish waste water receiving lakes
  • Long-term phytoplankton changes in acid and limed lakes in SW Sweden
  • Distribution of microcystins in a lake foodweb: no evidence for biomagnification
  • Hepatic and renal pathology of intraperitoneally administered microcystin-LR in rainbow trout (Oncorhynchus mykiss)
  • Cyanobacterial microcystin-LR equivalent is a potent and specific inhibitor of protein phosphatases 1 and 2A from both mammals and higher plants
  • Microcystins (cyanobacteria hepatotoxins) bioaccumulation in fish and crustaceans from Sepetiba Bay (Brasil, RJ)
  • Microcystin contamination in fish from the Jacarepagua Lagoon (Rio de Janeiro, Brazil): ecological implication and human health risk
  • Effects of microcystins on fish
  • The presence of microsystins in fish Cyprinus carpo tissue: a histopathological study
  • Impact on ecotourism by water pollution in the Olifants river catchment, South Africa
  • Dynamics of phytoplankton and phytobenthos in Lake Loskop (South Africa) and downstream irrigation canals
  • An overview of toxic freshwater cyanobacteria in South Africa, with special reference to risk, impact and detection by molecular marker tools
  • Microcystis aeruginosa: source of toxic microcystins in drinking water
  • Responses of phytoplankton upon exposure to a mixture of acid mine drainage and high levels of nutrient pollution in Lake Loskop, South Africa
  • Bioaccumulation of aluminium and iron in the food chain of Lake Loskop, South Africa
  • Identification of toxigenic Microcystis strains after incidents of wild animal mortalities in the Kruger National Park, South Africa
  • Determination of accurate extinction coefficients and simultaneous equations for assaying chlorophylls a and b extracted with four different solvents: verification of the concentration of chlorophyll standards by atomic absorption spectrometry
  • Effects of cell-bound microcystins on survival and feeding of Daphnia spp
  • Variations in the microcystin content of different fish species collected from a eutrophic lake
  • Accumulation and depuration of microcystins (cyanobacteria hepatotoxins) in Tilapia rendalli (Cichlidae) under laboratory conditions
  • Foodweb transfer, accumulation, and depuration of microcystins, a cyanobacterial toxin, in pumpkinseed sunfish (Lepomis gibbosus)
  • Accumulation of microcystin in Daphnia magna feeding on toxic Microcystis
  • A national survey of the incidence of cyanobacterial blooms and toxin production in major impoundments
  • Eutrophication, toxic cyanobacteria and cyanotoxins: when ecosystems cry for help
  • Effects of temperature on the stability of microcystins in muscle of fish and its consequences for food safety
  • Transfer, distribution and bioaccumulation of microcystins in the aquatic food web in Lake Taihu, China, with potential risks to human health
  • Relationship between microcystin in drinking water and colorectal cancer