Growth and feed utilization of goldfish (Carassius auratus) fed graded levels of brewers yeast (Saccharomyces cerevisiae)

In this study, a feeding trial was conducted to examine the potential of replacing fish meal with brewers yeast in practical diet of goldfish (Carassius auratus). Five isoproteic (۳۷% CP) and isocaloric (۳۳۵۰ kcal/kg) diets were formulated to contain graded levels of brewers yeast. Fish meal protein was replaced by ۰%, ۱۵%, ۲۵%, ۳۵%, and ۴۵% of yeast. Each diet was randomly allocated to triplicate groups of ۲۰ fish (initial average weight of ۰.۵۶ g fish-۱) in glass aquarium (۶۵L). Fish were fed three times per day to apparent satiation for ۸۴ days. At the end of the experiment, weight gain, specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), condition factor (CF), survival rate (SR), hepatosomatic indices (HSI) and body composition of goldfish fry were determined. According to the results, weight gain, SGR, FCR and PER of fish fed the diet including yeast replaced ۳۵% of the fish meal were better than those of fish fed the other diets. There were no significant differences in SR and HSI values among fish fed diets (p>۰.۰۵). However, CF among fish fed the experimental diets was significantly differ (p>۰.۰۵). Whole body composition was similar among fish fed different diets. The optimal replacement level of fishmeal protein by brewers yeast was determined by second-order polynomial regression to be (y= ۲, ۲۲۳۷- ۰,۰۰۰۴x۲ + ۰,۰۲۷۹x; R² = ۰,۹۹۷۷) ۳۴.۸۷۵%, on the basis of SGR

Keywords:

Saccharomyces cerevisiae , Carassius auratus , Fish meal replacement , Growth , Feed utilization.