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The studyAcute effects of vestaline (pendimethalin) herbicide exposed to juveniles of African catfish (Clarias gariepinus) was carried out to determine the toxicity of the herbicide using static bioassay. The study was designed with emphasis on the effects of Vestaline (Pendimethalin) on the behavioural and mortality rate of Clarias gariepinus juveniles. Also to study the effects of Vestaline (Pendimethalin) herbicideonphysico-chemical parameters of exposed water. The acute toxicity was carried out using 180 healthy fish of mean weight 27.97±0.03g which were divided into six treatments with each treatment having ten fish and the setup was in triplicate. The fish were exposed to 33,82.5,115.5,148.5,181.5mg/l concentrations of Vestaline (Pendimethalin) for 96 hours with control (0mg/l) also setup. The behavioural responses observed during the acute toxicity were; aggression, mucus secretion, erratic swimming, air gulping and discoloration. Data obtained were subjected to analysis of variance (ANOVA) and Regression at p< 0.05using Minitab 17.The results showed that all the behavioural responses were dose dependant. Also there was no mortality in the control (0.00mg/l) setup while mortality increased with increased the control (0.00) setup, while mortality increased with increase in concentration. The LC50 value of Vestaline was determined to be 113.56mg/l. Results of the physico-chemical parameters of water exposed to acute concentrations decreased significantly (p0.05 ). Vestaline (Pendimethalin) herbicide from this study is toxic on Clarias gariepinus juveniles and should be used with care. |
