Effects of two feed types on the growth speed and muscle nutritional components of Siniperca scherzeri
To understand the effects of two feeding modes-formulated feed and live prey fish,on the growth and muscle nutritional components of Siniperca scherzeri,two groups of juvenile fish were set,and fed on formulated feed(FG)or live prey fish(LG)respectively,to compare the differences in growth phenotypes and muscle nutrient components after conducting a 9 months comparative feeding experiment.The results showed as follows:in terms of growth phenotype,the survival rate,weight gain rate,viscera/body weight ratio,liver/body weight ratio and fatness of LG group were significantly improved than those in the FG group(P<0.05).In terms of muscle composition,the crude protein content(20.45%)in LG group was lower than that in the FG group(21.35%,P<0.05),while the crude lipid content(1.45%)was higher than that in the FG group(0.65%,P<0.05).However,there were no significant differences in moisture and ash content between the LG and FG groups.A total of 17 kinds of amino acids were detected in both juvenile fish muscle from LG and FG groups,the lysine content of LG group was significantly higher than that in the FG group(P<0.05),whereas the glycine and proline contents of LG group were lower than that in the feed group(P<0.05).Meanwhile,there was no significant difference in the contents of other 14 amino acids,total amino acids,essential amino acids,and umami amino acids.In terms of AAS and CS scores,the scores of essential amino acids except lysine in LG group were significantly improved than those in FG group(P<0.05).In terms of hydrolyzed fatty acids,17 kinds of fatty acids were detected in LG group,one more fatty acid(arachidic acid)than that in FG group.Moreover,13 kinds of fatty acids in muscle components had varied between LG and FG groups(P<0.05).The saturated fatty acid content(25.36%)in LG group was significantly lower than that in FG group(29.83%)(P<0.05),whereas the contents of monounsaturated fatty acid,polyunsaturated fatty acid,and EPA+DHA in LG group were significantly higher than those in FG group(P<0.05).The present study showed that fish fed on live prey fish showed improved growth performance than those fed on formulated feed.Meanwhile,high-protein and low-fat proportion of the muscle were found in Siniperca scherzeri under two feeding mode,indicated those fish were edible premium protein product for humans.The results of the study will be useful as a theoretical reference for the sustainable development of Siniperca scherzeri.
万方数据
维普
