Acute toxicity of chromium for Ctenopharyngodon idella, Cyprinus carpio and Tilapia nilotica
2013
Shaukat, T. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries) | Javed, M. (University of Agriculture, Faisalabad (Pakistan). Dept. of Zoology and Fisheries)
Acute toxicity of chromium (Cr) for three fish species viz. Ctenopharyngodon idella, C. carpio and Tilapia nilotica of 60-, 90- and 120-days age groups was determined in terms of 96-h LC50 and lethal concentrations. Among three age groups, 60-day fish showed significantly higher sensitivity to Cr with mean LC50 and lethal values of 87.01 mg L-1 and 129.77 mg L-1, respectively. While 120-days fish groups were significantly least sensitive to Cr with 96-h LC50 and lethal values of 129.77 and 210.20 mg L-1, respectively. All the three fish species showed significantly variable sensitivity against Cr. C. idella were significantly more sensitive to Cr, followed by that of C. carpio and T. nilotica. Significant variations in the sensitivity of three fish species appeared to be age and species specific. Among the three fish species T. nilotica exhibited significantly higher ability to accumulate Cr, followed by that of C. carpio and C. idella with the average concentrations of 66.28, 46.78 and 31.90 mug g-1, respectively. However, 120-days fish groups showed significantly higher tendency to amass Cr, followed by 90- and 60-days age groups. Fish organs exhibited greater variations in their capability to accumulate Cr during 96-h LC50 and lethal concentration exposures. 96-h LC50 exposure caused significantly higher accumulation of Cr, followed by that in kidney, gills, fins, scales, skin, bones and muscles, while at lethal concentrations, Cr accumulation followed the order: kidney greater than liver greater than gills greater than fins greater than scales greater than skin greater than bones greater than muscles.
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