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Article Title: Correlation of Toxicity with Bilge Water Exposure in African Catfish [Clarias gariepinus (Burchell, 1822)] Juveniles


Untreated bilge water is one of the causes of marine pollution. When discharged into the sea, aquatic organisms may ingest the chemical components of the wastewater and transmit them up the food chain which may ultimately be consumed by a variety of wildlife or humans. In this study, Clarias gariepinus juveniles were exposed to different concentrations (10, 20, 30, 40 and 50%) of bilge water for 96 hrs under laboratory conditions using a renewable static bioassay with continuous aeration to determine its acute toxicity. The LC50 of exposed juveniles was found to be 35.97 ml/L with lower and upper confidence limits of 18.98 ml/L and 30.28 ml/L respectively. Respiratory disturbance, erratic swimming, loss of equilibrium, lethargies and sudden death were observed in the exposed fish and these varied greatly with increase in concentration of the wastewater. The differences observed in the mortalities of C. gariepinus at varying concentrations were significant