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ThesisItem Open Access Studies on the toxic effect of some pesticides on enzymological parameters in Indian major carps(CCSHAU, 2015) Manju Rani; Gupta, R.K.In the present study,the toxic effect of the pesticides malathion, dimethoate and chlorpyrifos on the enzymological parameters in Indian major carps Cirrhinus mrigala and Labeo rohita were investigated. Certain effects possibly due to pesticide toxicity like fin erosion, fin blackening, pigmentation/ depigmentation, body hemorrhage, bleeding eyes; descaling and skeleton deformaties were also observed. Growth performance in terms of live weight gain, growth percent gain in body weight and specific growth rate was found to be decreased in both the fish species in treatment groups as compared to control. However, an increased Food Conversion Ratio was observed in pesticide treated fishes. In C. mrigala and L. rohita blood serum lactate dehydrogenase activity was found maximum (26.6 % and 25.6% respectively) subjected to malathion treatment at 0.001ppm. The maximum increase in Lactate dehydrogenase activity was observed to be 50.3% and 44.8 %, respectively when C. mrigala and L. rohita were exposed to a combination of dimethoate and chlorpyrifos at 0.001 ppm. Likewise, the maximum increase in activity of alkaline phosphatase in blood serum was 45.0% and 44.2%, respectivelyin C. mrigala and L. rohita exposed to the same treatment. Maximum increase in the cholinesterase activity (18.4% and 19.2 %, respectively) and lipase activity (18.4% and 19.2 %, respectively) was found subjected to malathion treatment at 0.001ppm. However, C. mrigala and L. rohita depicted maximum increase of 23.0% and 33.1%, respectively in activity of lipase and 24.1% and 24.7%, respectively in cholinesterase in blood serum when exposed to dimethoate and chlorpyrifos in combination at 0.001 ppm concentration. In C. mrigala and L. rohita, potassium, chloride and calcium ions activity was induced to a maximum of 44.3 % and 47.0%; 8.8% and 8.6 % and 13.2 % and 12.8%, respectively when treated with malathion at 0.001ppm. The maximum increase of activity of potassium in blood serum was 54.1% and 48.8% when the fish C. mrigala and labeo rohita exposed to in combination with dimethoate and chlorpyrifos at 0.001 ppm concentration respectively. After 60 days of treatment, residue found in C. mrigala and L. rohita was 0.0093 ppm and 0.0089ppm subjected tomalathion at 0.001 ppm. When L. rohita and C. mrigalawere exposed to malathionin combination with dimethoate and chlorpyrifos (0.001ppm) the residue was 0.109 ppm and 0.0111 ppm, respectively. In C. mrigala and L. rohita maximum reduction in protease activity was observed as14.5 % and 17.0% in malathion treatment at 0.001ppm and 17.5% and 15.4% in malathion treatment combined with dimethoate and chlorpyrifos at 0.001 ppm, respectively. Likewise, C. mrigala and L. rohita showed maximum reduction of 8.5% and 7.1% in amylase activity subjected to malathion treatment at 0.001ppm and 14.1% and 13.4% in malathion treatment combined with dimethoate and chlorpyrifos at 0.001 ppm, respectively.