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Influence of replacing fish meal with enzymatic hydrolysates of defatted silkworm pupa ( Bombyx mori L.) on growth performance, body composition and non‐specific immunity of juvenile mirror carp ( Cyprinus carpio var . specularis)
Author(s) -
Xu Xinxin,
Ji Hong,
Yu Haibo,
Zhou Jishu
Publication year - 2018
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13603
Subject(s) - biology , cyprinus , juvenile , feed conversion ratio , zoology , protein efficiency ratio , labeo , fish meal , carp , food science , meal , composition (language) , weight gain , endocrinology , body weight , fishery , fish <actinopterygii> , ecology , linguistics , philosophy
This study was conducted to investigate the effects of dietary supplementation of enzymatic hydrolysates of defatted silkworm pupa ( EHDSP ) on growth performance, body composition and non‐specific immunity of juvenile mirror carp ( Cyprinus carpio var . specularis). The control diet ( EHDSP 0) was produced using fish meal ( FM ) as the main protein source and the other four diets were formulated by substitution of 25% ( EHDSP 25), 50% ( EHDSP 50), 75% ( EHDSP 75) and 100% ( EHDSP 100) FM with EHDSP . Five groups containing 270 juvenile mirror carp (14.51 ± 0.03 g) were fed to apparent satiation for 8 weeks. The results indicated that the special growth rate, weight gain, protein efficiency ratio and feed conversion rate of experimental fish in EHDSP 25 and EHDSP 50 groups were not significantly different from EHDSP 0 group ( p > .05). The spleen index of experimental fish in EHDSP 25 group was significantly higher than that of EHDSP 0 group ( p < .05). The muscle protein content of experimental fish in EHDSP 25 and EHDSP 50 groups was significantly higher than that of EHDSP 0 group ( p < .05). Serum alanine aminotransferase and total cholesterol of experimental fish fed with the EHDSP were significantly lower than that of control ( p < .05). The activity of serum superoxide dismutase of experimental fish in EHDSP 25, EHDSP 50 groups was significantly higher than that of EHDSP 0 group ( p < .05). Intestinal trypsin activity of EHDSP 25 group was significantly higher than that of EHDSP 0 ( p < .05). In conclusion, EHDSP can be included into diet to replace 50% FM of juvenile mirror carp without negative effect on growth, furthermore, it can improve the non‐specific immunity and function of intestinal tract.