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Report on nitrite and freshwater fish

Water quality criteria for European freshwater fish

Year of publication 1984

Pages 19

Author Fisheries and Aquaculture Management Division

Product type Book (stand-alone)

ISBN 9251021775

Series title EIFAC Technical Paper

Series number 0532-940X - 46

Edition 1

Statutory body / Meeting title European Inland Fisheries and Aquaculture Advisory Commission (EIFAAC)

Cite this content as:

European Inland Fisheries Advisory 1984 Commission Working Party on Water Quality Criteria for European Freshwater Fish, Water quality criteria for European freshwater fish. Report on nitrite and freshwater fish. EIFAC Tech.Pap.,(46):19 p.

Language English

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    The toxicity of petroleum refinery effluent from Alesa-Eleme (Port Harcourt) Refinery, to two tilapia species, Oreochromis niloticus and Sarotherodon melanotheron, fresh and brackish water species respectively were investigated at an average temperature of 27°C ± 2.5°C under laboratory conditions. LT50 values increased from 29' minutes at 100% effluent concentration to 645 minutes at 10% effluent concentration (Vol/Vol) for O. niloticus and from 48 minutes at 100% to 1,917 minutes at 10% for S. melanotheron. Toxicity of effluent to fish decreased as the effluent aged. LT50 for 2-day and 6-day old effluent for O. niloticus at 63.1% effluent concentration were 30 and 70 minutes respectively. Median lethal concentrations (LC50) obtained from regressions of effluent concentrations and median lethal times (LT50) for 6-day old effluent at 24, 48 and 96 hours were 5.6, 3.29 and 1.93 percent respectively for O. niloticus, while the corresponding values for S. melanotheron were 9.48, 5.83 and 3.6% respectively. The safe concentrations of 6 and 15-day old effluents were estimated as 0.19 and 0.29% respectively for O. niloticus, while the corresponding values were 0.36 and 0.35 for S. melanotheron. The 24 and 48 hours LC50 values show that S. melanotheron is more resistant to oil refinery effluent than O. niloticus.
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