Growth, nitrogen gain and indispensable amino acid retention of pacu (Piaractus mesopotamicus, Holmberg 1887) fed different brewers yeast (Saccharomyces cerevisiae) levels

Abstract

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. KEY WORDS

Yeast derived from lignocellulosic biomass as a sustainable feed resource for use in aquaculture

“…Increasing replacement of fishmeal with S. cerevisiae in the latter study also resulted in slightly decreasing apparent digestibility of dry matter and energy. Replacing fishmeal with up to 380 g kg −1 dried S. cerevisiae yeast in diets for pacu ( Piaractus mesopotamicus , Holmberg 1887) had no significant effect on protein digestibility, whereas lipid digestibility was significantly increased . In Gilthead sea bream ( Sparus aurata) , increased protein digestibility has been obtained when replacing fishmeal with 100 g kg −1 and 200 g kg −1 S. cerevisiae in the diets .…”

Hilyses®, fermented Saccharomyces cerevisiae, enhances the growth performance and skin non-specific immune parameters in rainbow trout (Oncorhynchus mykiss)

“…Following dietary S. cerevisiae administration, improved body composition has not been consistently observed [10,12,22,23]. Li et al (2005) showed that whole-body composition of juvenile red drum (Sciaenops ocellatus) was not significantly affected by dietary supplementation with partially autolyzed S. cerevisiae [10].…”

“…Li et al (2005) showed that whole-body composition of juvenile red drum (Sciaenops ocellatus) was not significantly affected by dietary supplementation with partially autolyzed S. cerevisiae [10]. Abdel-Tawwab et al (2008) and AbdelTawwab et al (2010) observed significantly higher whole-body content of protein and ash in fish fed a yeast supplemented diet [12,22] while Ozório et al (2010) showed a significant decrease in moisture and protein content of the carcass in fish fed S. cerevisiae even though in all previous studies the growth-promoting influences of S. cerevisiae were observed [23]. It was assumed that changes in body composition such as protein and lipid contents could be linked with changes in their synthesis, deposition rate in muscle, and/or different growth rates [12].…”

Dietary Inclusion of Distillers Dried Grain for Growth of Juvenile Abalone Haliotis discus hannai

“…DDG contains substantial amounts of yeast cells, which are rich in protein and B-complex vitamins (Lim et al, 2007). Some studies with pacu (Ozório et al, 2010) and tilapia (LaraFlores et al, 2003) reported good growth with the dietary inclusion of yeast. In the present study, abalone fed diets containing DDG was not different among the treatments in whole body proximate composition.…”