Abstract
This study investigated the acute toxicity of lead acetate on Clarias gariepinus under laboratory conditions. Two hundred (200) Clarias gariepinus (185 ± 5 g weight and 27-36 cm length) were purchased from a commercial fish farm in Zaria. The fish were transported to the laboratory in a well-aerated 50-liter Jerrican half-cut with water. The fish were allowed to acclimatize for 14 days, during which they were fed commercial feed (42.0% crude protein) twice daily. A preliminary toxicity range-finding test was carried out using 20 fish. The outcome obtained from the range-finding test provided a guide for the acute toxicity study. The acute toxicity test was carried out using six of 10 fish per group in triplicate via static no-renewable bioassay procedure in 40-liter aquariums (76 cm × 38 cm × 38 cm) per group. The various concentrations of lead acetate used were G1 (0 mg/L), G2 (140 mg/l), G3 (145 mg/l), G4 (150 mg/l), G5 (155 mg/l) and G6 (160 mg/l) for 96-hour period. The fish samples exhibited varying behavioral and physical changes which range from erratic swimming, off-feeding, frequent gasping for air at the surface of the aquarium, skin discoloration, and eventual death. The vigor and severity of these features were time and concentration-dependent. The result showed that 96hours LC50 of Clarias gariepinus was 150.7mg/L. This indicates that a larger quantity of lead acetate is needed to cause mortality in the fish and is less harmful at lower concentrations.
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