Effects of Fish Meal Replacement by Maggot Meal on Growth Performance,Body Composition,Body Color and Non-specific Immunity of Cyprinus carpio L.

MENG Su-xuan;SHI Dong-Jie;QIN Jia;BI Peng-fei;LIN Cheng-li;BAI Dong-qing;LIANG Yong-Jun;Tianjin Agricultural College;The Aquatic Ecosystem and Aquaculture Key Laboratory;The Ornamental Fish Technology Engineering Center;Beijing Fisheries Research Institute ,National Engineering Research Center for Freshwater Fisheries;The Ministry of Agriculture Key Laboratory of Urban Agriculture (North);

Cyprinus carpio L;;maggot meal;;fish meal;;growth performance;;bod composition;;body color;;non-speeific immunity

This experiment aims to explore the impact of substituting maggot meal for fish meal on growth performance, body composition, body color and some serum immune indicates. 360 Cyprinus carpio L., with an original weight of(120.24±4.36)g apiece, were selected and divided at random into three parallel groups. The control group fed on basal feed. Six types of experimental feed(G0, G20, G40, G60, G80 and G100) were compounded over the course of 60 days by substituting maggot meal for 0%,20%, 40%, 60%, 80% and 100% of fish meal in basal feed respectively. The results showed that substitution of maggot meal for any amount of fish meal did not make any significant difference for experimental fish in terms of survival rate, muscular water, crude ash, carbon, total phosphorus and AKP(P >0.05). For G20 and G60, such substitution did not show any significant difference in terms of final weight, WGR and SGR of the experimental fish(P>0.05)and for G80 and G100, it decreased significantly(P<0.05). For G20 and G40, FCR of the experimental fish did not show any significant difference with that of the control group(P>0.05). For G60 and G100, FCR of the experimental fish rose significantly(P <0.05). Muscular crude protein content of the experimental fish rose proportionately with the addition of the substitution level. For G20 and G60, there was no significant difference compared with the control group, and it was much higher in G80 and G100 than in the control group(P<0.05). Crude fat and SOD in substitution groups fell significantly with the addition of the substitution(P<0.05). As for the impact of the substitution on body color, the chromatic values increased significantly in all experimental groups(P<0.05)except in G20(P>0.05). To sum up, the ratio of substitution of maggot meal for fish meal may not preferably exceed 60% with assessment indicates of growth performance, muscle composition, body-surface chromatic values and some serum non-specific immunity.