Toxicity of the Herbicide 2, 4-D Dimethyl Amine Salt on Behavioral, Growth and Hematology of Clarias gariepinus (Burchell, 1822) Fingerlings
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Keywords

2 4-D Dimethyl Amine Salt
Clarias gariepinus
Growth
Hematology
Toxicity

Abstract

The study aimed to determine the toxicological impacts of the herbicide 2, 4-D Dimethyl amine salt on Clarias gariepinus fingerlings. After a series of range finding tests, the fishes were exposed to lethal concentrations of 0.00, 1.34, 1.42, 14.8, 1.54, and 1.60ml/L for 96 hours as well as sub-lethal concentrations of 0.00, 0.069, 0.138 and 0.276ml/L of 2, 4-D Dimethyl amine salt for 8 weeks in a renewal bioassay. The value of 96 hours LC50 was 1.385ml/L.  Respiratory disturbance, erratic swimming, loss of equilibrium, lethargy, and sudden fish death were observed in 96hrs of exposed fish, and these varied greatly with differences in concentration of the toxicant, with a trend of significant (p<0.05) increase in mortality with increasing concentrations. The physicochemical parameters obtained before and after the experiment were within tolerable limits. The growth rates were significantly (p<0.05) reduced in fish exposed to sub-lethal concentrations of the herbicide 2, 4-D Dimethyl amine salt. The toxicant led to significant changes (p<0.05) in hematological parameters. Mean red blood cells and packed cell volume reduced with an increase in the concentration of the toxicant, while other parameters, such as white blood cells increased proportionally to the toxicant concentration. The lethal and sub-lethal exposure of Clarias gariepinus fingerlings to 2, 4 D dimethyl amine salt with values of 1.6 ml/L, 0.138ml/L 0.276 ml/L indicate significant changes in hematological parameters of acute, sublethal respectively.

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