Abstract

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This study investigated the bioaccumulation of microcystin on muscle of O. niloticus of fish farms of Brazilian semiarid reservoirs and their potential depuration of MCYST on fish’s muscle during ontogenetic fish development. Only one sampling was conducted in January 2012 in the five reservoirs located at Braziliam semiarid region. MCYST were detected in the waters of the all reservoirs and in 60% of the fish muscle samples. Significant differences were observed in MCYST concentrations for fish ontogenetic stages (p<0,05). Most MCYST concentration were observe in early fish stages. For an adult human weighing 60 kg ingesting 300g of fish muscle this MYCST level at fish on early fish stage phase represents an estimated daily intake (EDI) of 0,02 μg/kg of body weight. In juvenile and adults the levels of MCYST represent a daily intake of 0,005 and 0,001 μg/kg respectively, and np represent risk for consumers. However should be avoided consumption of fish when it confirmed the presence of microcystin already in the water. Both the control of eutrophication and the proper management of fish farming activity can serve as preventive measures in controlling algal blooms and their consequent risks to public health.

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