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https://www.arca.fiocruz.br/handle/icict/723
MICROCYSTINS (CYANOBACTERIA HEPATOTOXINS) BIOACCUMULATION IN FISH AND CRUSTACEANS FROM SEPETIBA BAY (BRASIL, RJ)
Author
Affilliation
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Centro de Informação Científica e Tecnológica. DIS, Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Laboratório de Ecofisiologia e Toxicologia de Cianobactérias. Instituto de Biofísica Carlos Chagas Filho. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Centro de Informação Científica e Tecnológica. DIS, Rio de Janeiro, RJ, Brasil.
Abstract in Portuguese
Blooms of cyanobacteria in water bodies cause serious environmental problems and the occurrence of toxic strains are also related with the human health. Aquatic animals could bioaccumulate microcystins (cyanobacteria hepatotoxins) and so, beyond water, the ingestion of contaminated food represents a human health risk. Recently, WHO recommended a maximum concentration of microcystins (MCYSTs) in drinking water and established the tolerable daily intake (TDI) for consumption of cyanobacteria products contends MCYSTs (0.04 mg21 kg21 day21). Sepetiba Bay is located in the municipal districts of Rio de Janeiro, Mangaratiba and Itaguaı´ being an important place of fishing activity. Due to the industrial development in the area, this bay is submitted to different environmental impacts, increasing the organic and industrial pollution. A strain of the nanoplanktonic cyanobacteria Synechocystis aquatilis f. aquatilis that produce MCYSTs was already isolated. In this study, we verified MCYSTs presence in muscle tissue of fish and crustaceans, which were harvested monthly in Sepetiba Bay during 11
months, in order to evaluate the potential risk of their ingestion. MCYSTs were analyzed by immunoassay techniques using the
ELISA Microcystin Plate Kit (ENVIROLOGIX INCw) and the concentration were expressed as microcystin-LR equivalent.
The analyses of seston samples, water, muscle tissues showed the presence of this cyanotoxin in all samples and it was verified
that 19% of the animals’ samples were above the limit recommended by WHO for human consumption. The maximum value found was of 103.3 mg kg21 (TDI 0.52 mg kg21 day21) and the minimum, was 0.25 mg kg21 in crabs muscle tissue (TDI of 0.001 mg kg21 day21). Such data demonstrate that, although in low concentrations, there is already a contamination of fish and crustaceans from Sepetiba Bay. We highlight that the recommended limit refers to healthy adult.
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