Analysis of effluents and histology of skin, liver and kidney the of pacus (Piaractus mesopotamicus) supplemented with trivalent chromium
Keywords:
supplement of chromium, effluents, histopathology, fishAbstract
O objetivo do trabalho foi caracterizar histologicamente a pele, o fígado e o rim de pacus jovens submetidos í alimentação suplementada com cromo trivalente e avaliar a presença de resíduo de cromo na água efluente. Para tanto, foram utilizados pacus com peso médio de 100 g distribuídos num delineamento inteiramente casualizado (DIC), em esquema fatorial 4x2, sendo quatro níveis de cromo (0, 6, 12, 18 mg/kg) e duas densidades de estocagem (4 e 20 kg/m3), com quatro repetições, durante 90 dias. Histologicamente ocorreu aumento do número de células caliciformes e células clava na epiderme dos pacus suplementados com 18 mg de cromo/kg, em qualquer densidade de estocagem. No fígado observou-se o mesmo efeito da alta densidade que ocorreu na epiderme, sendo que na densidade mais alta (20 kg/m3) as alterações já ocorreram no nível de 6 mg/kg de inclusão de cromo, inicialmente com congestão do sinusoide e agravando no nível de 18 mg/kg com necrose. O rim não apresentou alterações morfológicas visíveis quando suplementados e submetidos í s densidades de estocagem, porém a concentração de cromo no efluente produzido estava abaixo do recomendado como tolerável pelas normas brasileiras. Assim, pode-se concluir que o nível de 18 mg/kg de suplementação não se mostrou benéfico e que a densidade de estocagem, devido ao possível estresse provocado, acelera o processo de alteração histológica dos tecidos.
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