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Title: Quality of Effluents from Discharge ends of African Catfish Ponds during Fish Harvest
Authors: OKONJI, V. A.
Keywords: African catfish
water quality
fish culture
fish farming
Issue Date: 2012
Publisher: University of Benin Journal of Science and Technology
Series/Report no.: 1;1
Abstract: Effluents samples from eight African catfish (Clarias gariepinus) ponds at the Department of Fisheries experimental farms, University of Benin, Benin City, collected during fish harvest were analyzed for BOD, COD, settleable matter, soluble orthophosphate, total phosphorus, total ammonia, and nitrate. Settleable matter concentrations, for which 3.5 ml/litre has been suggested as the instantaneous maximum for effluents from fish ponds, ranged from 0 to 1.2ml/litre during the draining phase when 95% of water was discharged. Water discharged during seining for fish removal usually contained about 3.4ml/litre settleable matter (range 0.5 to 100 ml/litre). Concentrations of other potential pollutants, except nitrate, also increased during the seining phase. However, effluents discharged during the draining phase had higher levels of most measured parameters than first-order streams draining forested or agricultural water-sheds in the vicinity.
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