Open AccessGrowth, nitrogen gain and indispensable amino acid retention of pacu ( Piaractus mesopotamicus , Holmberg 1887) fed different brewers yeast ( Saccharomyces cerevisiae ) levels
Author(s) -
OZÓRIO R.O.A.,
TURINI B.G.S.,
MÔRO G.V.,
OLIVEIRA L.S.T.,
PORTZ L.,
CYRINO J.E.P.
Publication year - 2010
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/j.1365-2095.2009.00662.x
Subject(s) - piaractus mesopotamicus , biology , fish meal , pacu , yeast , food science , feed conversion ratio , nitrogen , zoology , biochemistry , fish <actinopterygii> , fishery , body weight , chemistry , organic chemistry , endocrinology
A feeding‐and‐digestibility trials were carried out to evaluate the efficacy of replacing fishmeal with brewers yeast Saccharomyces cerevisiae in diets of pacu, Piaractus mesopotamicus , juveniles. The feeding trial was conducted during 54 days with 450 fish (26.6 ± 1.7 g) testing six isonitrogenous (270 g kg −1 crude protein) and isoenergetic (19 MJ kg −1 crude energy) diets, with increasing yeast level to replace 0 (control), 30, 35, 50, 70 or 100% of dietary fishmeal. Growth performance and feed utilization increased with increasing dietary yeast level until 50% fishmeal replacement. Protein retention efficiency was higher in fish fed 35 and 50%. Protein digestibility and the fillet hue (the red/green chromaticity) were not significantly different among all treatments. Nitrogen gains were significantly improved in fish fed 35% replacement diet compared to fish fed the control diet. The retentions of indispensable amino acids tended to increase with increasing dietary yeast levels, with maximum retention at 35–50%. On the basis of our results, replacing 50% fishmeal by yeast in pacu diets successfully improved feed efficiency and growth performance, and reduced nitrogen losses, thereby reducing the nitrogen outputs from fish farms.