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Effects of Small Peptides Supplementation on Growth Performance, Body Composition and Serum Biochemical Indices of Juvenile Starry Flounder (Platichthys stellatus)

  • JIANG Kejun ,
  • WANG Jiying ,
  • ZHANG Limin ,
  • LIU Xudong ,
  • ZHANG Derui ,
  • SUN Yongzhi
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  • 1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
    2. Marine Fisheries Research Institute of Shandong Province, Yantai 264006, China

Received date: 2012-07-12

  Online published: 2013-01-04

Abstract

This experiment was conducted to investigate the effects of small peptides supplementation on growth performance, body composition and serum biochemical indices of juvenile starry flounder (Platichthys stellatus). Five hundred and forty starry flounder with an average body weight of (15.30?0.03) g were randomly divided into 6 groups with 3 replicates per group and 30 fish per replicate. The fish in those 6 groups were fed experimental diets supplemented with 0 (control group), 0.25%, 0.50%, 0.75%, 1.00% and 1.50% small peptides, respectively. The experiment lasted for 8 weeks. The results showed as follows: 1) the weight gain rate (WGR), feed intake rate (FIR), specific growth rate (SGR) and protein efficiency ratio (PER) in 0.75% and 1.00% groups were significantly higher than those in control group (P<0.05), while the feed conversion ratio in control group was significantly higher than that in other groups (P<0.05). 2) No significant differences were found in crude protein, crude lipid, moisture and ash contents of whole body among all groups (P>0.05). In dorsal muscle, the crude lipid content was decreased first and then increased with small peptides supplementation increasing, and all supplemental groups except 0.25% group were significantly lower than control group (P<0.05); the crude protein content in 1.00% and 1.50% groups was significantly higher than that in control group (P<0.05); no significant differences were found in moisture and ash contents among all groups (P>0.05). 3) Compared with the control group, serum total cholesterol (TCHO) content in 0.50% group was significantly decreased (P<0.05); serum triacyglycerol (TG) content in all supplemental groups was significantly decreased (P<0.05); serum total protein (TP) and globulin (GLB) contents in 1.00% group were significantly increased (P<0.05);no significant difference was found in serum albumin (ALB)content among all groups (P>0.05). Serum lysozyme (LSZ) activity was significantly improved by dietary small peptides supplementation (P<0.05), and the highest value appeared in fish fed with 1.00% small peptides. Compared with the control group, serum catalase (CAT) activity was significantly increased (P<0.05) and serum maleic dialdehyde (MDA) content was significantly decreased (P<0.05) in 1.00% group. According to the above results, it is concluded that small peptides can effectively improve growth performance, lipid metabolism, immune and antioxidant capacity of juvenile starry flounder, and the optimum dietary small peptides supplemental level is 0.93% to 1.00% under this experimental condition

Cite this article

JIANG Kejun , WANG Jiying , ZHANG Limin , LIU Xudong , ZHANG Derui , SUN Yongzhi . Effects of Small Peptides Supplementation on Growth Performance, Body Composition and Serum Biochemical Indices of Juvenile Starry Flounder (Platichthys stellatus)[J]. Chinese Journal of Animal Nutrition, 2013 , 25(1) : 222 -230 . DOI: 10.3969/j.issn.1006-267x.2013.01.028

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