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The effect of mild concentrations of diesel (10.40,15.60,21.00 and 26.00 mg/l) on some biochemical parameters such as Aspartate transaminase (AST), Alanine transaminase (ALT), and Alkaline phosphatase (ALP), in the tissue of periwinkle ( tympanotonus fuscatus ) were examined using a renewal static bioassay for six days. The activities of the enzymes were measured on 120 specimens of periwinkle of size between 4.5-5.5cm lengths. The result of AST activity in the muscle showed either an increased or decreased activity against the control. The activity of ALT showed significant (p=0.05) decrease in all the test concentrations. ALT also showed significant difference (p=0.05) which were either higher or lower than the control value. In the viscera, activity of AST significantly increased (p=0.05) than that of the control. ALT activity was significantly increased (p=0.05) above the control except at 10.40ml/L where a significant decrease (p=0.05) was observed. Significant increase (p=0.05) was observed in the activity of ALP above the control value except at 10.40ml/L. The result of the tissue enzyme activities indicated alteration in the biochemistry of tympanotonus fuscatus and therefore could be used as a biomarker of aquatic pollution and toxicities. KEYWORDS : Diesel, Tympanotonus fuscatus , Enzyme, Toxicity, pollution

Diesel exposure of <i>Tympanotonus fuscatus</i> and its effects on enzyme activity