Effect of dietary protein levels on growth and body composition of Leuciscus waleckii tumensis
An 8-week feeding experiment was conducted to evaluate the effect of dietary with different protein levels on the growth and body composition of the Leuciscus waleckii tumensis.Six hundred and thirty fish with an average body weight of(3.37±0.07)g were selected and randomly divided into six groups,with three replicates in each group and thirty-five fish in replicate.Fish in each group were fed with experimental diets with protein levels of 30.12%(group 1),33.21%(group 2),36.17%(group 3),39.64%(group 4),42.19%(group 5)and 45.37%(group 6),respectively.The results showed that the final body weight,weight gain rate,specific growth rate and feed efficiency of Leuciscus waleckii tumensis with different dietary protein levels increased first and then decreased.With dietary protein level increasing,there were no significant differences in crude protein,moisture and ash content of fish body components(P＞0.05),the lipid content of fish body had a decreasing trend,and compared with the low protein level and high protein level,the body lipid content of fish body with high protein level was significantly decreased(P＜0.05).According to the indexes of growth and body composition and the comprehensive evaluation of specific growth rate and feed efficiency by regression curve fitting,the protein requirement of Leuciscus waleckii tumensis was 38.07%to 38.52%.
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