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Evaluation of juvenile silver perch Bidyanus bidyanus (Mitchell) nutritional needs using high‐ and low‐protein diets at two feeding levels
Author(s) -
Harpaz S.,
Sklan D.,
Karplus I.,
Barki A.,
Noy Y.
Publication year - 1999
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1046/j.1365-2109.1999.00376.x
Subject(s) - biology , perch , juvenile , zoology , body weight , protein requirement , aquaculture , nutrient , fish <actinopterygii> , fishery , ecology , endocrinology
Juvenile silver perch Bidyanus bidyanus (Mitchell) of 3.2 g average weight were reared under controlled conditions on diets containing 23.4% and 40.6% protein. Diets were administered at 3% or 6% of the fish biomass per day. Both the protein concentrations and the feeding level of the diet influenced growth and proximate composition of the fish at the end of the 100‐day growth trial. The energy requirement for these fish for maintenance was found to be 81.9 kcal × BW –0.8 and, for each unit of energy retained per metabolic body weight, 7.05 needed to be supplied, whereas for each gram of protein retained per metabolic body weight, 5.79 g were required. The results indicate that it is possible to obtain the same weight increment when feeding a 23.4% protein diet at a level of 6% body mass day –1 compared with only 3% body mass day –1 of a 40.6% protein diet. This study provides the first estimation of nutrient requirements for juvenile silver perch, and these estimations require further refinement.