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Optimizing dietary protein sources for Japanese sea bass ( L ateolabrax japonicus ) with an emphasis on using poultry by‐product meal to substitute fish meal
Author(s) -
Wang Yan,
Wang Fei,
Ji WenXiu,
Han Hua,
Li Peng
Publication year - 2015
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.12242
Subject(s) - fish meal , lateolabrax , meal , sea bass , bass (fish) , feed conversion ratio , biology , protein efficiency ratio , zoology , food science , dry matter , commercial fish feed , body weight , fish <actinopterygii> , aquaculture , fishery , endocrinology
Abstract This study evaluated the potential of using poultry by‐product meal ( PBM ) to replace fish meal in diets for Japanese sea bass, L ateolabrax japonicus . Fish (initial body weight 8.5 g fish −1 ) were fed six isoproteic and isoenergetic diets in which fish meal level was reduced from 400 g kg −1 (diet C) to 320 (diet PM 1), 240 (diet PM 2), 160 (diet PM 3), 80 (diet PM 4) or 0 g kg −1 (diet PM 5), using PBM as the fish meal substitute. The weight gain ( WG ), specific growth rate, nitrogen retention efficiency, energy retention efficiency and retention efficiency of indispensable amino acids were higher in fish fed PM 1, PM 2, PM 3 and PM 4 diets than in fish fed diets C or PM 5. The phosphorus retention efficiency was lower in fish fed PM 3, PM 4 and PM 5 diets than in fish fed C, PM 1 or PM 2 diets. Fish fed diet PM 5 had the highest feed conversion ratio, total nitrogen waste output ( TNW ) and total phosphorus waste output ( TPW ) among the treatments. No significant differences were found in the hepatosomatic index or body contents of moisture, lipid and ash among the treatments. Fish fed diet C had lower condition factor and viscerosomatic index than those of fish fed PM 1, PM 3, PM 4 and PM 5 diets. The results of this study indicate that using fish meal and PBM in combination as the dietary protein source produced more benefits in the growth and feed utilization of Japanese sea bass than did using fish meal or PBM alone as the dietary protein source. The dietary fish meal level for Japanese sea bass can be reduced to 80 g kg −1 if PBM is used as a fish meal substitute.