Effect of various doses of Cr (VI) on survival and growth of Cyprinus carpio

This study assessed the impact of different doses of hexavalent chromium [(cr (vi)] on survival and growth of cyprinus carpio. it was investigated that cr (vi) adversely affected the survival and growth of cyprinus carpio in temporal dose pattern through ambient water. fish refused to accept the feed immediately after the exposure but after 6 to 7 hours it began to take feed. in this study it was revealed that cr (vi) exposure significantly altered several physicochemical variables of the water: cr (vi) increased bod,cod,co2,alkalinity,calcium,hardness,chlorides,tds and turbidity whereas,ph and do were decreased on cr (vi) exposure. growth decreased significantly with the increase in cr (vi) concentration and the rate of decline in length (24%) was less than weight (51%). mortality was 40% in exposed fish. actual chromium concentration in tanks varied from 36 to 118μg/ml exposed with 25 to 150mg/l of cr (vi). exposure of fish to different chromium concentrations in water significantly (p<0.05) reduced their feed consumption and specific growth rate as compared to control. this decrease was linearly correlated with the increase in chromium concentration. copyright 2015 zoological society of pakistan.