Vol. 3, Issue 7, Part S (2017)

Abstract
Background: Pollutants such as insecticides may affect significantly certain physiological and biochemical processes that different kinds of insecticides can cause serious impairment to health status of fishes. Fishes are very sensitive to a wide variety of toxicants in water; various species of fish show uptake and accumulation of many contaminants or toxicants such as pesticides. Toxicity studies have played an important role in man’s efforts to monitor and modify the effects of his activities on the biota. Aim and Objective: To study the Phosalone (35%EC) an organophosphate Induced toxicity and behavioural changes of fresh water fish Ctenopharyngodon idella Results: In the present study, we observed percent mortality along with exposure concentrations of freshwater fish Ctenopharyngodon idella (Grass carp), to Phosalone (35 % EC) formulation, for 24,48,72,96 hrs in static system along with percent mortality and probit mortality were presented. The LC₅₀ values of Phosalone (35% EC) for the fish Ctenopharyngodon idella (Grass carp), after 24,48,72,96 hrs, in static system were 2.8, 2.4, 2.0 and 1.6 ppm respectively. The LC₅₀ value was high for 24 hrs i.,e 2.8, the LC₅₀ value was low for 96 hrs i.,e 1.6 ppm but for 48 hrs the LC₅₀ value 2.4 ppm and for 72 hrs 2.0 ppm only. The low value for 96 hrs may be due to accumulated toxicant accumulates effect on the fish. The LC₅₀ value regression value (R²) of Phosalone (35%EC) for exposed fish Ctenopharyngodon idella (Grass carp), after 24,48,72,96 hrs, in static system were observed. Conclusion: The present study LC₅₀ value of Phosalone (35% EC) exposed to the fish, C. idella is agreed with the earlier reports and it is evidence from the above started LC₅₀ values that organochlorines, organophosphates, carbamate and synthetic pyrethroids are more toxic to fish based on LC₅₀ values. Due to their persistence and high toxicity on fish and mammals, a restricted on their use is imposed, based on the above results the selected test compound was rated in toxicity.