author(s)
Khushwinderjit Singh, Ajeet Singh, SN Datta and Sarbjeet Kaur

abstract
The present study was conducted to evaluate the changes in biochemical composition of flesh of the common carp fingerlings fed with diets replacing protein of plant origin i.e. soybean with animal protein in the form of fish silage at different levels. Five experimental diets (D₁ – D₅) were prepared to replace soybean meal with fish silage @ 15% (D₂), 30% (D₃), 45% (D₄) and 60% (D₅) against control (D₁) diet. No significant difference in water quality recorded w.r.t incorporation of fish silage in the diets and all basic water quality parameters were within suitable range. In present study, protein assimilation recorded maximum at 34.98% (D₄). Among biochemical parameters of fish flesh, moisture content ranged between 78.20 – 81.43%, crude protein 13.90 – 16.50%, fat1.60 – 2.50%, NFE 1.10 – 1.50%, crude fibre 0.30 – 0.36% and ash 1.06 – 1.60%. In fish flesh, accumulation of protein content was significantly improved when fishes were fed with diets replacing soybean meal with fish silage protein @ 45% (T₄).