Abstract— Effect of cypermethrin (25%EC) on total protein and nucleic acid content in different tissues of Cirrhinus mrigala was assessed by static renewal bioassay, using different sub-lethal concentrations (5, 10, 15 and 20% of 96h LC50) for 5, 10 and 15 days duration. There was a gradual decrease in protein content in all the tissues under sub-lethal concentrations at all exposure periods with maximum percentage of depletion (45.26%) in muscle and minimum (35.12%) in kidney at 15 days and at 20% 96hLC50. DNA and RNA contents were not altered much by cypermethrin at 5th day which later gradually decreased with increased exposure period. Decrement in DNA content is less in muscle when compared to the other tissues. Maximum percentage of depletion in DNA was (17.17%) in liver and minimum (13.94%) in muscle at 15 days and at 20% 96hLC50. RNA content decreased significantly in liver (29.90%), muscle (25.53%), brain (23.38%), kidney (21.82%) and gill (20.34%). This decrease was comparatively higher at 15 days and at 20% 96hLC50. Influence of cypermethrin was found to be time and exposure dependent for both the nucleic acids in the aquaculture practices used edible fish.
Keywords— Cypermethrin, DNA, Protein, RNA, Synthetic pyrethroids, Toxicity.
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