International Journal of Ecology and Environmental Sciences

authors
Archana Durgude, Dabir Pathan, Nikhil S. Sawant, Pankaj Patil, Gauri Shelar

abstract
In the study, P. sphenops fry with initial length in the range from 1.0 to 1.1 cm and initial weight ranging from 0.0575 to 0.0590 g were reared at four different stocking densities of 0.33 fry L^-1, 0.5 fry L^-1, 1.0 fry L^-1 and 2.0 fry L^-1 for a period of 60 days. For this experiment, the circular plastic tubs (40 L) were used and volume in each tub was maintained up to 36 L. The fry were fed semi-purified flake feed containing 39.48% crude protein at the rate of 10% body weight day^-1. The maximum values of length gain (191.46%), weight gain (935.96%), specific growth rate (3.8965%) and survival (100%) were recorded for the fry reared at density of 0.33 fry L^-1. The fry reared at densities of 0.33 and 0.5 fry L^-1 showed significantly (P<0.05) better length gain and survival than that of fry reared at densities of 1.0 and 2.0 fry L^-1. The fry reared at density of 0.33 fry L^-1 showed significantly higher weight gain and specific growth rate than those of fry reared at other densities. In the study, growth and survival were decreased with increase in stocking density