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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 12, No. 1, 2008, pp. 63-66
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Bioline Code: ja08010
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 12, No. 1, 2008, pp. 63-66
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Lethal Limits and Respiration in the Cichlid Fishes, Tilapia zillii , Sarotherodon galilaeus , S. melanotheron and Oreochromis niloticus Exposed to Effluent from Chemistry Department Laboratories.
Fafioye, O.O.; Adeogun, A.O. & Omoniyi, I.T.
Abstract
In this study, the lower and upper lethal limits, LC50 and respiration of the freshwater cichlid
fishes, Tilapia zillii, Sarotherodon galilaeus, S. melanotheron and Oreochromis niloticus exposed to effluents from
Chemistry Department Laboratories were investigated. The mixing of the effluents produced a reduction in pH and
dissolved oxygen and a fairly constant temperature and salinity of the media, while the toxicity of the effluents
increased. The LC50 values after 24 and 48-h exposure in the effluent media were 0.24% and 0.21% for T. zillii;
0.26% and 0.24% for O. niloticus; 0.25% and 0.23% for S. galilaeus; 0.27% and 0.26% for S. melanotheron,
respectively. The effect of chemical effluent on the rate of respiration of the treated cichlids produced lower rates of
oxygen consumption in the order of S. galilaeus>O. niloticus>S. melanotheron>T. zilili in the highest concentration
of the effluent. The results obtained from this study have shown that the effluents from Chemistry Department
Laboratories are not treated as they produced respiratory impairment and physiological dysfunction in the exposed
fish. It is suggested that proper treatment of these effluents be carried out before being discharged into the
surrounding stream.
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© Copyright 2008 - Journal of Applied Sciences & Environmental Management
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