TOXICITY OF CASSAVA WASTEWATER EFFLUENTS TO AFRICAN CATFISH: CLARIAS GARIEPINUS (BURCHELL, 1822)

Sinet, Ethiopian Journal of Science Pub Date : 2006-04-12 DOI:10.4314/SINET.V28I2.18254

S. Adewoye, O. Fawole, O. Owolabi, J. Omotosho

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引用次数: 38

Abstract

The relative lethal and sublethal toxicity of cassava wastewater effluents from a local food factory were investigated on Clarias gariepinus fingerlings using a renewable static bioassay. The physico-chemical characteristics of the cassava wastewater effluents showed a number of deviations from the standards of the Federal Environmental Protection Agency (FEPA) on the guidelines for effluent discharges. Considering the pollutants of the effluent, cyanide (CN) is suspected to be primarily responsible for the toxicity, although synergistic effect of other pollutants cannot be ruled out. At each exposure, in the two tests, the test-organisms showed signs of serious stress, swimming pattern changed and mortality increased over relatively small increase in concentration. The LC 50 for lethal and sublethal tests were 0.024 mg1 -1 and 0.0064 mg1 -1 , respectively. The differences observed in the mortalities and bioconcentration of metals in fish muscles of varying concentrations were significant (p Keywords : bioconcentration, Clarias gariepinus , effluent, toxicity, wastewater SINET: Ethiopian Journal of Science Vol. 28(2) 2005: 189-194

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木薯废水对非洲鲶鱼的毒性研究:clarias gariepinus (burchell, 1822)

采用可再生静态生物测定法研究了当地某食品厂木薯废水对克拉丽亚斯鱼种的相对致死和亚致死毒性。木薯废水的物理化学特性与联邦环境保护局关于废水排放准则的标准有若干偏差。考虑到废水的污染物，虽然不能排除其他污染物的协同作用，但怀疑氰化物(CN)是毒性的主要原因。在两次测试中，每次暴露时，测试生物都表现出严重压力的迹象，游泳模式发生了变化，死亡率因浓度的相对较小增加而增加。致死和亚致死试验的lc50分别为0.024 mg g1 -1和0.0064 mg g1 -1。不同浓度的鱼类肌肉中金属的死亡率和生物浓度的差异是显著的(p关键词:生物浓度，Clarias gariepinus，出水，毒性，废水)[j] .埃塞俄比亚科学杂志Vol. 28(2) 2005: 189-194

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Sinet, Ethiopian Journal of Science

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