Abstract
Laboratory evaluations were made to assess the toxicological and biochemical effect of cypermethrin on fingerlings of common edible freshwater culture carp (Labeo rohita). There was a significant negative (P < 0.05) correlation observed between effective doses of cypermethrin and exposure periods; that is, LC50 values decreased from 0.323 μg/L (6 h) to > 0.278 μg/L (12 h), > 0.240 μg/L (18 h) and >0.205 μg/L (24 h). Exposure to sublethal doses of cypermethrin for 24 h and 96 h exposure period caused significant (P < 0.05) time- and dose-dependent alterations in total protein, total free amino acids, nucleic acids, glycogen, pyruvate, and lactate level and in the activity of enzyme protease, alanine aminotransferase, aspartate aminotransferase, acid phosphatases, alkaline phosphatases, acetylcholinesterase, and cytochrome oxidase in liver and muscle tissues of fish. Thus, cypermethrin has potent piscicidal activity against fingerlings of fish Labeo rohita and adversely affects their behavioural patterns, shifting aerobic pathway of fish respiration towards anaerobic pathway and also inhibiting energy production by suppressing ATP synthesis.
Highlights
Synthetic pyrethroids are more effective than other insecticides like carbamate and organophosphatase against several pests [1]
The present work was designed to assess the toxic effect of cypermethrin on fingerlings of Labeo rohita and its sublethal effects on its metabolism
Fishes of control group are free from such behavioural changes, which indicates cypermethrin was responsible for above altered behaviour and fish mortality
Summary
Synthetic pyrethroids are more effective than other insecticides like carbamate and organophosphatase against several pests [1]. Besides controlling hazardous insect pest population synthetic pyrethroids affect several nontarget organisms [2]. Cypermethrin, a synthetic pyrethroid is a broad-spectrum insecticide, used extensively in households and industrial and agriculture fields [3] for control of several insect pests [4]. Cypermethrin is highly toxic against freshwater snail L. accuminata and affects both their metabolism and reproduction [9, 10]. The present work was designed to assess the toxic effect of cypermethrin on fingerlings of Labeo rohita and its sublethal effects on its metabolism. Freshwater, edible fish of capture fishery in India and elsewhere, due to their high nutritive food value
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