Bioaccumulation and transformation of methylmercury and selenite using zebrafish (Danio Rerio) larvae as a model

► Zebrafish larvae as a model to test bioaccumulation. ► High bioaccumulation values of methylmercury and low bioaccumulation values of inorganic selenium. ► Rapid and simple determination methodologies to determine mercury and selenium in complex samples. ► Speciation studies (HPLC-ICPMS) does not show any substantial metabolic process of the analytes. ► Cost of the bioaccumulation test performed is at least 10 times lower than other alternative tests.