CYHALOTHRIN INDUCED BIO-CHEMICAL ALTERATIONS IN THE GRASS CARP CTENOPHARYNGODON IDELLUS (VALENCIENNES)
Prasada Rao G. D. V., Veeraiah K.* Krishna Ch., Rajeswari A. and Sindhoori E.
ABSTRACT
The fresh water fish Ctenopharyngodon idella (Valenciennes) was exposed to Cyhalothrin a synthetic pyrethroid insecticide commercial grade 2.5% EC, which was used extensively in this region and the acute toxic effects were studied. The static and continuous flow-through LC50 values obtained for 24, 48, 72 and 96 h were 0.0589, 0.0574, 0.0556 and 0.0540 ppm respectively for commercial grade cyhalothrin whereas for continuous flow-through the acute LC50 values for commercial cyhalothrin were 0.0548, 0.0519, 0.0519 and 0.0493 respectively. Among the obtained above LC50 values, the 96 h LC50 values were taken as lethal and 1/10th of 96 h LC50 Value was taken as sub-lethal concentration. The test fish Ctenopharyngodon idella was exposed to lethal and sub-lethal concentrations of commercial (EC) grade for 24 and 96 h and the bio-chemical changes such as glycogen, proteins and nucleic acids in the vital organs viz; Gill, brain, liver, muscle and kidney were estimated. The LC50 values indicate that the insecticide cyhalothrin commercial grade is highly toxic to the fish. The changes in bio-chemical constituents were also significant. The data obtained in all were discussed with the available literature.
Keywords: Cyhalothrin, grass carp, Sub-lethal, Bio-chemical, and Continuous-flow.
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