Replacing fishmeal with soybean meal affects survival, antioxidant capacity, intestinal microbiota, and mRNA expression of TOR and S6K1 in Macrobrachium rosenbergii  

作　　者：Zhili DING Dongsheng ZHOU Jinxian ZHENG Xuefeng CHEN Youqin KONG Changle QI Yan LIU Qiongying TANG Guoliang YANG Jinyun YE 

机构地区：[1]Zhejiang Provincial Key Laboratory of Aquatic Resources Conservation and Development,College of Life Science,Huzhou University,Huzhou 313000,China [2]Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture,Key Laboratory of Freshwater Aquaculture Genetic and Breeding of Zhejiang Province,Zhejiang Institute of Freshwater Fisheries,Huzhou 313001,China

出　　处：《Journal of Oceanology and Limnology》2022年第2期805-817,共13页海洋湖沼学报（英文）

基　　金：Supported by the Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture and the Key Laboratory of Freshwater Aquaculture Genetic and Breeding of Zhejiang Province of the Zhejiang Institute of Freshwater Fisheries(No.ZJK201906)。

摘　　要：Using alternative plant-derived dietary protein to replace fishmeal,combined with practical evaluation indexes,is a recent focus for aquaculture practices.An 8-week feeding experiment with giant freshwater prawn Macrobrachium rosenbergii post-larvae was conducted to determine the eff ects of replacing fi shmeal(FM)with soybean meal in the feed,in terms of growth performance,antioxidant capacity,intestinal microbiota,and mRNA expression of target of rapamycin(TOR)and ribosomal protein S6 kinase B1(S6K1).Four isonitrogenous diets with isocaloric value were prepared to contain 100%,75%,50%,or 25%FM as the protein source(dietary treatments FM100,FM75,FM50,and FM25,respectively).Each diet was fed to post-larval prawns(mean weight 0.045±0.002 g)twice a day in four replicates.No signifi cant diff erence in weight gain was observed among all groups,but the survival rate of prawns fed the FM50 and FM25 diets was signifi cantly lower than that of prawns fed the FM diet.The mRNA expression of both TOR and S6K1 were the lowest in hepatopancreas of prawns fed the FM25 diet.Superoxide dismutase activity of prawns fed the FM25 diet was significantly lower than that of prawns fed FM50.In contrast,the malondialdehyde content was signifi cantly higher in prawns fed FM25 as compared with those fed FM75.The proportion of fishmeal in the diet did not affect the composition of core(phylum-level)intestinal microbiota,but greater fishmeal replacement with soybean meal had a potential risk to increase the relative abundance of opportunistic pathogens in the gut when considered at the genus level.These results suggest that fishmeal replacement with soybean meal should not exceed 50%in a diet for post-larval M.rosenbergii.

关 键 词：animal protein plant protein REPLACEMENT protein synthesis health CRUSTACEAN 

分 类 号：S966.12[农业科学—水产养殖]