Abstract:
Laboratory tests were conducted to determine the acute toxicity of chromium (Cr) in terms of 96 h LC50 and lethal concentrations, to three age groups viz. 60, 120 and 240 day of Catla catla, Labeo rohita and Cirrhina mrigala at constant water temperature (30oC), pH (7.50) and total hardness (300 mg L-1). At termination of each trial, the fish were dissected and their organs viz. bones, gills, gut, intestine, kidney, liver, scales, skin, muscle and fats were isolated for the determination of metal concentrations. Sixty days old fish species showed significantly higher sensitivity to Cr in terms of both LC50 and lethal concentrations of 74.35 and 122.19 mg L-1, respectively, while 240 days old fish were significantly least sensitive. However, among three fish species L. rohita was significantly greater sensitive to Cr, followed by C. mrigala and C. catla. Significant variations in the sensitivity of C. catla, L. rohita and C. mrigala to Cr appeared to be species specific depending upon metal exposure concentration, water temperature, dissolved oxygen and pH. Fish organs showed greater variations in ability to concentrate Cr during acute exposures. However, liver and kidney exhibited significantly higher tendencies as 47.94 and 40.48 µg g-1 to accumulate Cr.
Page(s):
961-965
DOI:
DOI not available
Published:
Journal: International Journal of Agriculture and Biology, Volume: 13, Issue: 6, Year: 2011