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Total replacement of fish meal by soy bean meal, with various percentages of supplemental L‐methionine, in diets for blue catfish, Ictalurus furcatus (Lesueur)
Author(s) -
Webster C D,
GoodgameTiu L S,
Tidwell J H
Publication year - 1995
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/j.1365-2109.1995.tb00917.x
Subject(s) - ictalurus , catfish , biology , methionine , fish meal , feed conversion ratio , protein efficiency ratio , meal , zoology , weight gain , soybean meal , food science , soy protein , body weight , fish <actinopterygii> , biochemistry , fishery , amino acid , endocrinology , ecology , raw material
A 12‐week feeding trial was conducted in aquaria with juvenile (8.9 g) blue catfish, Ictalurus furcatus (Lesueur), to examine effects of totally replacing fish meal with a high (65%) percentage of soy bean meal (SBM) in prepared diets. Five isonitrogenous (35% protein) and isocaloric (10.5 kJ digestible energy g −1 of diet) diets were formulated. Diet 1 was similar to a high‐quality commercial channel catfish diet, containing 15% fish meal and 42% SBM. Diets 2‐5 contained 0% fish meal and 70% SBM with various amounts (0.0%. 0.3%, 0.6% and 0.9%) of L‐methionine added. After 12 weeks, individual weight, weight gain, survival, specific growth rate, feed conversion ratio, protein efficiency ratio and food intake were not significantly different ( P > 0.05) among treatments and averaged 36 g, 302%, 100%, 1.6% day −1 . 2.4,1.3, and 3.4% body weight, respectively. Whole‐body compositions of fish were not significantly different ( P > 0.05) among treatments and averaged 75%, 61% and 27% for percentage moisture, protein and fat, respectively. These data suggest that a diet with an all‐plant protein source (SBM) can totally replace fish meal in a diet for blue catfish, without adverse affects on weight gain or body composition, when the dietary protein level is 35% and fish are fed to satiation.