Author(s): Ezike C

Abstract: Three hundred and sixty (360) juveniles of African Freshwater catfish Clarias gariepinus were collected from Luis Fish Farm Warri, Delta State and then were brought to the Departmental Laboratory of Fisheries and Aquaculture, Ebonyi State University Abakaliki (latitude 6⁰, 20’ 49’’N, longitude 8⁰ 06’ 11’’E), Nigeria. Experimental fish were exposed to 6 treatment concentrations (20, 10, 5, 2.5, 1.25 and 0.00) ml/L of water soluble fraaction of Bonny light crude oil in triplicate replications of 60 fish per treatment for 10 weeks. Lower levels of toxicant led to reduced carbohydrate food reserves in which liver and muscle glycogen were decreased significantly (P<0.05) while plasma glucose reduced significantly at 1.25 ml/L of water soluble fraction of Bonny light crude oil and resulted to hypoglycaemia but the same increased significantly (P<0.05) from 5 ml/L and resulted to hyperglycaemic condition in exposed fish. WSF of Bonny light crude oil led to dose dependent liver and muscle glycogens and may cause hypoglycaemic or hyperglycaemic conditions at different exposure levels and should be prevented from entry into the aquatic environment.

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