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In the present study species of tilapia sold in the Centro de Abastecimento on the city of Feira de Santana (Bahia/Brazil) were used to assess the contamination of the rivers in the Paraguacu basin. For that fish micronucleus test were carried out. Samples were collected at seven different times in the months of May to August 2008, and 22 specimens of tilapia were acquired. Three models of different protocols were used. In the first, the three steps were made on the same day, drying of the smear, fixing with methanol 100% and staining with Giemsa10%. In the second, only the drying was held on the day of collection, the other steps were taken 24 hours later. In the third and last, only the staining was done in subsequent days. In a total of 20,000 cells, 119 micronuclei were found, which indicates the action of genotoxic agents in the cells of the fish. Their consumption in large-scale may establish genotoxic agents contamination chains of the population of Feira de Santana. Additional studies are suggested to identify the agent and contamination chain therefore to implement the required measures for the restoration of health and the quality of life

pesticidas

TILÁPIAS (Actinopterygii: Cichlidae) COMERCIALIZADAS EM FEIRA DE SANTANA (BAHIA) COMO BIOINDICADORES DE POLUIÇÃO AMBIENTAL EM RIOS DA BACIA DO PARAGUAÇU