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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. 15, No. 2, 2011, pp. 341-345
Bioline Code: ja11059
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 15, No. 2, 2011, pp. 341-345

 en Simulation of heavy metal contamination of fresh water bodies: toxic effects in the catfish and its amelioration with co-contamination with glyphosate
OKONKWO, F O & EJIKE, C E C C

Abstract

The toxic implications of fresh water contamination with zinc in the catfish, Clarias albopunctatus check for this species in other resources (Lamonte and Nicole, 1927), and the effect of a co-contamination with a sub-lethal dose of glyphosate (Roundup) was studied using the static bioassay model. Thirty six fish were divided into 3 equal groups. Fish in Group 1 were placed in normal tap water, and served as the control group, while fish in Groups 2 and 3 were placed in water contaminated with ZnSO4 and ZnSO4 + glyphosate, respectively. The study lasted for 96 hours (though sampling was done at the 48th hour). Biochemical markers of toxicity were measured and the fish liver and gill histology were studied using standard protocols. The results show that ZnSO4 was significantly toxic to the fish only after 96 hours. Co-contamination of the water with both toxicants was found to ameliorate the toxic effects of ZnSO4 significantly. The metal chelating property of glyphosate may be responsible for the observed attenuation of toxicity in the fish in Group 3.

Keywords
Clarias albopunctatus, glyphosate, metal contamination, toxicity, ZnSO4

 
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