An investigation on the effect of paraquat on
organosomatic indices and condition factor of Clarias
gariepinus sub-adult was carried out. Thirty six C.
gariepinus (weight, 362.64 ± 95.88g; length, 37.65 ±
2.85cm) sub adult were exposed in a static renewal,
triplicate design to control (no added paraquat) or
552mg/l paraquat in intermittent (two days exposed and
two days in clean water alternately) and continuous
exposures for 14 days. The result showed a transient
significant (ANOVA, p>0.05) increase in the continuous
exposure compared to the intermittent exposure and
control for Hepatosomatic index (HSI) on day 7.
However, at the end of the experiment there were no
significant treatment effects in the gills-somatic index
(GSI), Hepatosomatic index (HSI) and renasomatic index
(RSI). On day 7, there was no significant treatment effect
in the condition factor (Fulton’s K) however, on day 14
the intermittent and continuous exposures showed
significant decreases compared to the control, values
(mean ± STD) were 0.60 ± 0.05, 0.51± 0.07, 0.49 ± 0.08. In
conclusion, exposure of commercial paraquat to C.
gariepinus did not affect the organosomatic index but
resulted in poor condition factor especially during
Keywords : Hepatosomatic Index (HSI), Renatosomatic Index (RSI), Gills-Somatic Index (GSI), Pesticides, Continuous Exposure.