Effect of Various Levels of Dietary Protein on Bioenergetic's Parameters of Snow Trout (Shizothorax zarudnyi) Juveniles

The study investigates the effect of dietary proteins on growth of Snow trout juveniles (Shizothorax zarudnyi) fingerlings. Triplicate groups of fish (average weight±SD, 13.44±1.97g) were fed for eight weeks four isolipid and isoenergetic experimental diets (7.57±0.35% crude lipid, 3.18±0.14 kcal.g-1 dry matter, respectively) containing 25, 30, 35 or 40% crude proteins. The results showed growth rate of fish fed with 25% protein diet was higher than that of fish fed with 30, 35 and 40% protein diets, but differences were not significant (P>0.05). Proximate analysis indicated that the lipid, protein and ash components of whole body were affected by the diets (P<0.05), whereas the moisture content of whole body was unaffected by the increase in dietary protein content (P>0.05). The study showed that a dietary protein level of 25 % was optimal for the species for proper growth and feed conversion.