Abstract
This study deals with the effect of sublethal exposure of brick kiln effluent on lipid and protein peroxides, Aspartate Transferase (AST), Alanine Transferase (ALT) and Alkaline Phosphatase (ALP) activities and mobilization of thyroid-stimulating and thyroid hormones in gill and hepatopancreas of Channa punctata Bloch., with supporting histochemical investigations in these tissues. Acclimatized adult fishes of either sexes of three groups were reared separately in three aquaria. Aquarium-I comprised the normal control group, and the other two aquariums, i.e. Aquarium-II and Aquarium-III, comprised experimental groups of fishes exposed to 20ppm/L and 30ppm/L of brick kiln effluents, respectively. Before these, the LC50 value of the Fish for brick kiln effluent was evaluated as 55±0.50 ppm/L for 28 days. Increased lipid and protein peroxides, decreased transaminase activities with hypothyroidic conditions were observed both in gills and hepatopancreas on treatment. Significant alternations of these biochemical parameters were recorded, with some drastic changes in the histo-architecture regarding treatment issues. Gills showed hypertrophy with fusion and curving of gill lamellae. Spiked secondary gill lamellae were also observed to have several degenerative features. Decreasing hepatocytes and vacuolation at several places were recorded in hepatopancreas with necrosis of the tissues and patchy degeneration.
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