Effects of Fish Meal Replacement with Fermented Antarctic Krill Meal on Growth Performance, Body Color and Serum Biochemical Indexes of Koi Carp (Cyprinus carpio L.)

Abstract

To investigate the effects of replacing fish meal with fermented Antarctic krill meal on growth performance, body color, and serum biochemical indexes of koi carp, 450 koi carp with an average body weight of (4.92±0.22) g were randomly divided into five groups with three replicates per group and 30 fish per replicate. In the control group, we added unfermented defatted Antarctic krill meal, and in the experimental groups, we added defatted Antarctic krill meal fermented by Enterococcus faecalis, Lactobacillus plantarum, Clostridium butyricum, and compound bacteria (1:1:1), which were termed as ES (control group), EF, LP, CB, and MIX, respectively. The addition amount of Antarctic krill meal in each group was 200 g/kg, and the experiment lasted for 70 days. The results showed the following: Compared with those in the control group, the replacement of fish meal with fermented Antarctic krill meal significantly improved final body weight (FBW), weight gain rate (WGR), and specific growth rate (SGR) (P0.05). Based on the above results, using complex bacteria to ferment krill meal in the koi carp feed is recommended with a 20% addition level of defatted krill meal, which can effectively improve the absorption and conversion utilization rate of krill meal.

Keywords

• fermented antarctic krill meal
• koi carp
• growth
• body color
• serum biochemical indexes
• gene expression