TOXIC EFFECT OF MERCURY AND CADMIUM TO THE CADMIUM PRETREATED LIFE STAGES OF COMMON CARPI CYPRINUS CARPI° (LINN.)A.M. RAMESHA, T.RC. GUPTA AND CHANDRAKANT LINGADHALAbstract Toxic effect of mercury and cadmium to the cadmium stressed fry, advanced fry and fingerlings of common carp were studied by static bioassay tests. The 69h LC50 of mercury to cadmium stressed fry, advanced fry and fingerlings workcd out to be 0.313, 0.316 and 0.221 mg/1 respectively. For unstressed fry, advanced fry and fingerlings the 96h 1.C50 of mercury worked out to be 0.242, 0327 and 0.380 mg/1 respectively. The 96h LC50 for cadmium stressed fry, advanced fry and fingerlings exposed to cadmium were 4.280, 4.444 and 5.095 mg/1 respectively. Whereas, 96h LC50 of cadmium for unstressed fry, advanced fry and fingerlings worked out to be 2.840, 2.913 and 4.559 mg/1 respectively. The results show that the cadmium stressed life stages were more resistant to toxicity of mercury and cadmium than the unstressed group. Behavioural changes observed during the exposure period are given.
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