Accumulation and toxic effects of microcystin in tilapia (Oreochromis niloticus) from an eutrophic Brazilian lagoon

作者：Hauser Davis Rachel Ann^*; Lavradas Raquel Teixeira; Lavandier Ricardo Cavalcanti; Azero Rojas Edwin Gonzalo; Serpa Guarino Alcides Wagner; Ziolli Roberta Lourenco

来源：Ecotoxicology and Environmental Safety, 2015, 112: 132-136.

DOI：10.1016/j.ecoenv.2014.10.036

• Bioaccumulation
• Microcystin
• Tilapia, Gonads
• Bile

Microcystin (MC) accumulation and depuration in environmentally exposed tilapia (Oreochromis niloticus) at a chronically contaminated eutrophic lagoon was studied. This is one of the scarce reports on microcystin accumulation in bile of environmentally exposed fish, and gonad MC accumulation in the field, in contrast to laboratory exposure experiments. Results show that preferential MC accumulation in the environment occurred in tilapia fish muscle, followed by gonads, liver and, finally, bile. Biliary MC excretion in in situ conditions indicates elimination from the body to a certain degree. High gonad MC bioaccumulation is of concern, since this could indicate potential reproductive problems in this species. This study also demonstrated that tilapia shows similar oxidative stress responses (in the form of reduced glutathione, GSH) in the environment as those observed in laboratory exposed fish. MC dietary intake values for tilapia muscle and liver were above the limits imposed by international legislations, indicating that the local human population should exercise care when ingesting this species as a part of their diet and that human ingestion of MC-contaminated samples should be carefully monitored.

• 出版日期2015-2