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Acute Toxicity of Lindane (Gamma Hexachloro-Cyclohexane) to African Catfish (Clarias gariepinus, Burchell, 1822)

Author(s): E.O. Lawson | P.E. Ndimele, A.A. Jimoh and O.O. Whenu

Journal: International Journal of Animal and Veterinary Advances
ISSN 2041-2894

Volume: 3;
Issue: 2;
Start page: 63;
Date: 2011;
Original page

Keywords: Clarias gariepinus | LC50 | LT50 | Lindane | minimum lethal concentration | minimum lethal time

The acute toxicity of Lindane to African Catfish (Clarias gariepinus) juveniles was assessed in a static renewal bioassay for 96 h to examine the effects of Lindane on C. gariepinus, ascertain their level of tolerance and their suitability as bio-indicator in freshwater ecosystems. Eight graded concentrations of lindane were prepared as 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 ppm and a control experiment (0.0 ppm). The 96 h median lethal concentration (LC50) value computed using probit method was 1.29 ppm. The median lethal time (LT50) of 0.9, 1.0 and 1.1 ppm was zero while the LT50 of 1.2, 1.3 and 1.4 ppm are 4365 min (~73 h), 3548 min (~59 h) and 2884 min (~48 h), respectively. The minimum lethal concentration was 1.40 ppm while the minimum lethal time was 4365 min (~73 h). At various concentrations of lindane, fish showed uncoordinated behaviour such as incessant gulping of air and increase in opercular ventilation. The number of survivors in each concentration differ significantly (p
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