Effect of supplemental dietary Lactobacillus plantarum on growth performance,serum biochemical indexes and resistance to Vibrio harveyi infection of Lateolabrax maculatus

LIU Hui; LU Yao; XIN Yun-teng; DONG Le; DONG Fu-lin; LIN Ji-liang; YU Chao-lei; ZHANG Li-li

doi:10.13557/j.cnki.issn1002-2813.2023.23.010

Abstract：The experiment was conducted to investigate the effect of different levels of Lactobacillus plantarum on the growth performance,serum biochemical indexes,antioxidant capacity,immune indexes,and anti-infection ability of Vibrio harveyi in Lateolabrax maculatus.A total of 450 Lateolabrax maculatus with an initial weight of(173.47±1.49)g were selected and randomly divided into five groups,with three replicates per group and 30 fish per replicate.The Lateolabrax maculatus in the control group(LP0 group)were fed a basic feed,while the experimental group added 1.0×104(LP4 group),1.0×106(LP6 group),1.0×108(LP8 group),1.0×1010 CFU/g(LP10 group)Lactobacillus plantarum to the basic feed,respectively.The experimental lasted for 56 days.The results showed that the Lateolabrax maculatus in the LP6 group had a significant increase in the final weight,weight gain rate,specific growth rate,and superoxide dismutase activity in the liver than other groups(P＜0.05).Compared with the LP0 group and LP4 group,the feed coefficient,muscle crude fat,serum triglycerides,and liver malondialdehyde content of the Lateolabrax maculatus in the LP6 group were significantly reduced(P＜0.05),while the serum complement,lysozyme,immunoglobulin,and liver total antioxidant enzyme levels were significantly increased(P＜0.05).Compared with the LP0 group,the LP4 group and LP10 group,the LP6 group showed a significant increase in the plumpness of Lateolabrax maculatus(P＜0.05).Compared with the LP0 group,the LP6 group showed a significant increase in muscle crude ash content(P＜0.05),as well as a significant increase in the liver catalase and glutathione peroxidase activity(P＜0.05).The experiment indicates that Lactobacillus plantarum can improve the growth performance,immunity and antioxidant capacity of Lateolabrax maculatus,enhance the body's ability to resist Vibrio harveyi infection and adding 1.0×106 CFU/g of Lactobacillus plantarum has a good probiotic effect.