Addition of oligosaccharide prebiotics into feeds can effectively enhance growth and immune-related performance of fish.Alginate oligosaccharide,an oligosaccharide prebiotic extracted from marine fucoidan,plays an important role in improv-ing growth and immune performance of aquaculture animals.In order to investigate the effects of alginate oligosaccharide on the growth and immune performance of Lateolabrax maculatus juvenile,we conducted a 42-day experiment by adding alginate oligosaccharide to basic feed at doses of 0,50,100,and 200 mg·kg-1(alginate oligosaccharide:basic feed)to prepare experimental feed.The results show that the highest weight gain rate(WGR)[(96.50±7.95)％]and specific growth rate(SGR)[(1.73±0.09)％·d-1]of juvenile were observed with alginate oligosaccharide addition of 100 mg·kg-1.Expression of gh was significantly up-regulated in 100 mg·kg-1 group(P＜0.05).Meanwhile,the intestinal muscular thickness,villus height,villus width of juve-niles,as well as the activities of trypsin(TRY),amylase(AMS)and lipase(LPS)in 100 mg·kg-1 group were still higher than those of the control group(P＜0.05).With increase of alginate oligosaccharide content,the activities of superoxide dismutase(SOD),catalase(CAT),glutathione peroxidase(GSH-Px)and lysozyme(LZM)all increased significantly in liver of juvenile(P＜0.05),while the malondialdehyde(MDA)content decreased significantly(P＜0.05).Therefore,alginate oligosaccharide can improve the immune level of L.maculatus juvenile significantly.Besides,it has a certain promotion effect on its growth.The study provides theoretical references for the use of alginate oligosaccharide to promote the healthy growth of L.maculatus.
维普
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