| Resumo: | Organochlorine pesticides (OCPs) are classified as persistent organic pollutants. The presence of OCPs in the environment is of global concern as they are persistent, ubiquitous and highly toxic. The purpose of this study was to evaluate the presence of organochlorine pesticides (aldrin, endrin, chlordane, mirex, heptachlor, DDT, DDE and DDD) in the muscle of four fish species from Vicente Guerrero Dam in Tamaulipas (Mexico): catfish (Ictalurus punctatus), carp (Ciprynus carpio), largemouth bass (Micropterus salmoides) and tilapia (Oreochromis niloticus). Solid phase extraction and gas chromatography with electron capture detector was used to detect the pesticides. The highest concentration found was for DDE in largemouth bass, carp and catfish (239.90, 165.98 and 212.31 ng/g, respectively) and for chlordane in catfish and largemouth bass (44.66 and 64.22 ng/g). There is a risk of carcinogenic effects if carp and largemouth bass are regularly consumed by the population in the region as the concentration of p-p′-DDE is higher than the recommendations of the US Environmental Protection Agency
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