Jyoti Prakash Srivastavaa, S.N. Khatria, Ashok Kumar*b
Poonam Srivastavaa & Sudhir Mehrac
aDepartment of Zoology, DBS Colloege, Kanpur
bDepartment of Zoology, DAV College, Kanpur
cDepartment of Zoology, Saffia Science College, Bhopal
Received 18th January 2007; Revised 6th July 2007
Abstract : Present study showed that survival, development and growth of early lifestage of H.fossilis from eyed stages to swim-up stages were not observed to be adversely affected by exposure to hexavalent chromium from 14 to 265 μg/L. Survival of fishes were not affected in different levels of treatment except 265 μg/L and control. Survival was exceeding 98% from hatch stage to swim up stage. No difference in the length and weight of fish was observed in all the treated groups of the experiment. Exposure to Cr+6did not affect hatching period and required time. The number of deformed individuals (Spinal curvatures etc.) that survived after hatching was low in treated groups and control. There was no observable difference in behaviour of exposed fish. Average length of exposed fishes were consistent at the termination of the experiment. 51, 118 and 265 μg/L treatment groups showed slightly lower average in body length than the controls. The average weight of fishes were not affected by exposure of hexavalent chromium, only 51, 118 and 265 μg/L exposed groups showed slightly lower average weight than the control group.
The concentration of hexavalent chromium in the whole body of fishes was observed to be highly significant in all the four stages (hatching, half way between hatching, swim up and termination)