Open AccessEffect of DL ‐methionine supplementation on the success of almost total replacement of fish meal with soybean meal in diets for hybrid tilapia ( O reochromis niloticus × O reochromis mossambicus )
Author(s) -
FigueiredoSilva C.,
Lemme A.,
Sangsue D.,
Kiriratnikom S.
Publication year - 2015
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12150
Subject(s) - tilapia , oreochromis mossambicus , biology , oreochromis , fish meal , soybean meal , methionine , feed conversion ratio , weight gain , meal , zoology , food science , limiting , body weight , biochemistry , fish <actinopterygii> , fishery , endocrinology , amino acid , ecology , mechanical engineering , raw material , engineering
This study evaluated the effects of increasing levels of methionine ( M et) supplementation on the success of almost total replacement of fish meal ( FM ) with soybean meal ( SBM ) in diets for hybrid tilapia ( O reochromis niloticus × Oreochromis mossambicus ). Fish were fed for 70 days a FM ‐based diet ( D iet1‐positive control) or SBM ‐based diets supplemented with graded levels of DL ‐methionine ( D iet2 to D iet7). Contrast in dietary Met, concentration was created by supplementing D iet2‐negative control with 1.2 ( D iet3), 2.4 ( D iet4), 3.6 ( D iet5), 4.8 ( D iet6) or 6.0 g kg −1 ( D iet7) of DL ‐ M et. Specific growth rate ( SGR ), feed conversion ratio ( FCR ), and protein gain and retention efficiency ( PER ) improved significantly with increasing levels of dietary DL ‐ M et supplementation. Moreover, nonlinear regression analysis of the effects of supplementing SBM ‐based diet with graded levels of DL ‐ M et indicated that a dietary M et + C ys level of 15.7 and 12.5 g kg −1 diet (as fed) was required to reach 95% of maximum weight and protein gain, respectively. Supplementation of SBM ‐based diet with graded levels of DL ‐ M et proved an effective strategy in reducing FM content in practical diets for hybrid tilapia. Data also indicate that adjustment of dietary formulas according to currently recommended M et or M et + C ys dietary concentrations is probably limiting maximum growth potential of hybrid tilapia.