Effects of Cypermethrin on Condition Factor and Organosomatic Indices of Clarias Gariepinus

Abstract

The effect of sublethal exposure of Clarias gariepinus (mean length 29.47±1.88cm; mean weight 276.44±81.91g) to cypermethrin (0.00 – control, 0.05, 0.10, 0.20, and 0.25mlL^-1) for 10 days on the condition factor (k) and organosomatic indices such as Renatosomatic index (RSL), Hepatosomatic Index (HIS), Spleenosomatic Index (SSI) and Cardiosomotic (CSI). The results obtained from the study indicated no significant differences (P > 0.05) between the initial (K1) and final (K2) condition factor. In all the organosomatic indices used to assess response to stress in fish exposed to cypermethrin, significant increase (P<0.05) was observed in RSI, while the values of HIS decreased significantly when compared to the control after 10days. The values of SSI and CSI obtained during the trial were within the same range, as no significant changes was observed. Hence, in monitoring pollution of aquatic environment when administering cypermethrin, HIS and RSI will be a good biomarker of pollution effect on Clarias gariepinus.