Effect of dietary protein, lipid and carbohydrate contents on the liver composition and enzyme activity of Cyprinus carpio communis fingerlings

Abstract

This study aimed to determine a feed formulation with best protein to energy ratio which would result in better liver
composition and enzyme activity of Cyprinus carpio communis. Fingerlings having average weight 1.64 g ± 0.13 and
length 5.26 ± 0.10 cm were fed on four different formulated feeds and a control feed (each in a triplicate set), 6% of
their body weight, three times a day, during 90 days. Feeds were formulated using ground nut oil cake, mustard oil
cake, rice bran, wheat bran, fish meal and soybean meal in order to suffice the balanced need of protein and energy
of the common carp. Liver composition and acid and alkaline phosphatase activity of fingerlings were measured.
There was a significant increase in liver lipid content with the increase in dietary carbohydrate level. The ACP and
ALP activity was the maximum in the fingerlings fed on the diet having optimum protein to energy ratio of 20.54 mg
protein/Kj. This work concluded that a diet containing 40% protein, 9.31% lipid and 10.08% carbohydrate is the best
one for a more profitable and successful culture of the common carp.