Some managerial nutritional factors affecting fish production

The present study was conducted out at the Wet. Lab. of the Department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, Egypt. The experimental period lasted 90 days which started from July, to October, 2005.A factorial design (2x3x2) was conducted for studying the effect of dietary energy levels, supplementation levels of vitamin B5 and stocking density on growth performance traits, chemical body composition, blood components of Nile tilapia (Oreochromis niloticus) and water quality parameters. All fish were of an average initial weight of 14 g/fish after an acclamyzation period for three weeks. Experimental fish were divided into two main groups