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African Journal of Biomedical Research
Ibadan Biomedical Communications Group
ISSN: 1119-5096
Vol. 7, No. 2, 2004, pp. 65-70
Bioline Code: md04015
Full paper language: English
Document type: Research Article
Document available free of charge

African Journal of Biomedical Research, Vol. 7, No. 2, 2004, pp. 65-70

 en LETHAL AND SUB-LETHAL EFFECTS OF COPPER TO THE AFRICAN CATFISH (CLARIAS GARIEPINUS) JUVENILES
OLAIFA, F.E. OLAIFA A.K, AND ONWUDE, T.E.

Abstract

Lethal and sub-lethal effects of copper on Clarias gariepinus check for this species in other resources were studied using a 96-hour static bioassay. Copper (as copper chloride, CuCl2. H2O) was used to prepare the stock solution from which five standard concentrations 0.0, 1.8, 3.2, 5.6, and 10.0 mg/L were prepared (coded A - E). 15 juvenile C. gariepinus fish having a mean weight and length 5.8g and 18 cm respectively were used. The 96-hour LC50 estimated using the logarithm method were 0.6, 0.71 and 0.7 mg/l for replicates 1, 2 and 3 respectively with mean as 0.67mg/l. Haematological changes were generally not significant (P> 0.05). Copper concentrations in bone and muscle-tissues were also determined. The mean copper concentration in bone ranged from 1.86 (treatment A) to 17.04 ppm (Treatment E) and muscle 1.29 (treatment A) to 55.5 ppm (treatment E). There were significant differences (p<0.05) in mortality among treatments.

Keywords
Lethal, Copper, Catfish juvenile

 
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