Effects of Whole Fat or Defatted Antarctic Krill Meal Instead of Fish Meal on Growth Performance, Body Color and Serum Biochemical Indexes of Red-White Koi Carp (Cyprinus carpio var. koi)

LIANG Yixin; WU Guoqiang; YANG Yexin; LIU Chao; LIU Yi; MU Xidong; WANG Xuejie; HU Yinchang; SONG Hongmei

doi:10.3969/j.issn.1006-267x.2021.12.038

2021 , Vol. 33 >Issue 12: 6973 - 6981

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.12.038

AQUATIC ANIMAL NUTRITION AND FEED

Effects of Whole Fat or Defatted Antarctic Krill Meal Instead of Fish Meal on Growth Performance, Body Color and Serum Biochemical Indexes of Red-White Koi Carp (Cyprinus carpio var. koi)

LIANG Yixin ,
WU Guoqiang ,
YANG Yexin ,
LIU Chao ,
LIU Yi ,
MU Xidong ,
WANG Xuejie ,
HU Yinchang ,
SONG Hongmei

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1. Key Laboratory of Aquatic Animal Immune Technology of Guangdong Province, Key Laboratory of Leisure Fisheries, Ministry of Agriculture and Rural Areas, Pearl River Fisheries Rresearch Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;
2. College of Fisheries and Life sciences, Shanghai Ocean University, Shanghai 201306, China

Received date: 2021-05-11

Online published: 2021-12-16

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Abstract

This study was conducted to study the effects of fish meal substituted by whole fat or defatted Antarctic krill meal on growth performance, body color and serum biochemical indexes of red-white koi carp. A total of 630 red-white koi carp with the average body weight of (13.05±0.50) g were randomly divided into 7 groups with 3 replicates per group and 30 fish per replicate. One group was fed a basal diet (Q0) as control group, and the other 6 groups were fed the basal diet supplemented with whole fat or defatted krill meal (the replacement levels of fish meal were 10% whole fat, 20% whole fat, 30% defatted, 10% defatted, 20% defatted and 30% defatted, respectively) as experimental groups, which were named as Q10, Q20, Q30, T10, T20 and T30, respectively. At the end of 60 days of feeding trial, growth performance, body color and serum biochemical indexes were measured. The results showed as follows:1) compared with the Q0 group,the replacement of fish meal with krill meal significantly improved the specific growth rate of red-white koi (P<0.05), and decreased the condition factor. 2) With the increasing of krill meal substitution proportion for fish meal, the lightness (L^*) value in the red area of the body surface of red-white koi carp was no significant difference among groups (P>0.05), but the redness (a^*) value and the yellowness (b^*) value were gradually increased with the increasing the substitution level of krill meal. The improvement of body color of whole fat krill meal was better than that of non-fat krill meal. 3) As the replacement level of fish meal by Antarctic krill meal increased, the glutamic oxal transaminase/glutamic pyruvic transaminase (AST/ALT) ratio of whole fat group (Q10, Q20 and Q30 groups) was significantly decreased (P<0.05), AST/ALT ratio of degrease group (T10, T20 and T30 groups) was significantly increased (P<0.05), serum total cholesterol content had no significant difference among all groups (P>0.05), and serum triglyceride content was significantly decreased (P<0.05). Based on the above results, the growth performance, body color and serum biochemical indices of koi carp can be improved by using proper amount of whole fat or degreased krill meal instead of fish meal. It is recommended that the replacement level of whole fat krill meal in koi carp diet with fish meal supplementation level of 500 g/kg is 20% to 30%, and the replacement level of defatted krill meal is 10% to 20%.

Key words： red-white koi carp; Antarctic krill meal; growth performance; body color; serum biochemical indices

Cite this article

LIANG Yixin , WU Guoqiang , YANG Yexin , LIU Chao , LIU Yi , MU Xidong , WANG Xuejie , HU Yinchang , SONG Hongmei . Effects of Whole Fat or Defatted Antarctic Krill Meal Instead of Fish Meal on Growth Performance, Body Color and Serum Biochemical Indexes of Red-White Koi Carp (Cyprinus carpio var. koi)[J]. Chinese Journal of Animal Nutrition, 2021 , 33(12) : 6973 -6981 . DOI: 10.3969/j.issn.1006-267x.2021.12.038

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