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Evaluation of the optimum dietary protein level for the maximum growth of juvenile beluga ( Huso huso L.1758)
Author(s) -
Mohseni Mahmoud,
Pourali Hamid Reza,
Kazemi Rezvan,
Bai Sungchul C
Publication year - 2014
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 - 10.1111/are.12134
Subject(s) - huso , beluga , biology , juvenile , zoology , fish meal , fish <actinopterygii> , menhaden , weight gain , fishery , dietary protein , sturgeon , body weight , endocrinology , ecology
A 10‐week feeding trial was carried out to evaluate the optimum dietary protein level for the maximum growth of juvenile beluga, Huso huso . Fish averaging 1.34 ± 0.07 g (mean ± SD) was randomly distributed into 18 circular fibreglass tanks of 500 L capacity (20 fish per tank). Six iso‐caloric diets were formulated to contain 30 ( CP 30 ), 35 ( CP 35 ), 40 ( CP 40 ), 45 ( CP 45 ), 50 ( CP 50 ) and 55% ( CP 55 ) crude protein ( CP ). Fish were fed each of the six experimental diets in triplicate groups. At the end of feeding trial, weight gain ( WG ) and specific growth rate ( SGR ) in fish fed CP 40 and CP 45 diets were significantly higher than those of fish fed CP 30 , CP 35 , CP 50 and CP 55 diets ( P < 0.05). Lipid retention increased significantly from 24.7% to 31.6%, but protein retention decreased from 54.6% to 35.6% with increasing protein levels from 30% to 50%. Muscle total essential and non‐essential amino acid ( EAA & NEAA ) concentrations increased with the dietary protein level up to CP 45 diets. Muscle total EAA concentrations (%) of fish fed CP 45 were significantly higher than those of fish fed CP 30 , CP 35 , CP 50 and CP 55 , but there was no significantly different between those of fish fed CP 40 and CP 45 . Muscle total NEAA concentration (%) of fish fed CP 45 were significantly higher than those of fish fed CP 30 and CP 35 diets. Broken‐line analysis of WG suggested that the optimum dietary protein level could be 38.9% for maximum growth performance in juvenile beluga (1.3–77 g).