Evaluation of silver perch (Bidyanus bidyanus, Mitchell) nutritional requirements during grow-out with high and low protein diets at two feeding levels |
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| Authors: | S Harpaz H Jiang & D Sklan |
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| Institution: | Department of Aquaculture, Agricultural Research Organization, The Volcani Center, PO Box 6, Bet Dagan 50250, Israel;Beijing Fisheries Corporation, Technical Division, Jiao Men Road number 18, Fengtai District, Beijing, 100075, China;Department of Animal Sciences, Faculty of Agricultural, Food &Environmental Quality Sciences, The Hebrew University of Jerusalem, PO Box 12, Rehovot 71200, Israel |
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| Abstract: | Silver perch (Bidyanus bidyanus, Mitchell) of 65 g average weight were reared at high density under controlled conditions on diets containing 24.8% and 40.6% protein. Diets were fed at 2% or 4% of the fish biomass day?1. Both protein concentrations and feeding level of the diet influenced growth and proximate composition of the fish at the end of the 50‐day growth trial. Energy requirement for maintenance for these fish was found to be 77 cal BW?0.8 and for each unit of energy retained 3.78 cal BW?0.8 needed to be supplied, and for each gram of protein retained per metabolic body weight 5.04 g were required. The results indicate that it is possible to obtain the same weight increment when feeding a 24.8% protein diet at a level of 4% body weight day?1 as compared with only 2% body weight day?1 of a 40.6% protein diet. This study indicates that the nutritional requirements for early grow‐out are similar to those found in a previous study with juvenile silver perch and adds information concerning the required relationships between dietary amino acids. The results provide information required for further refinement of nutrition for this species. |
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| Keywords: | nutritional requirements silver perch (Bidyanus bidyanus Mitchell) |
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