Effects of different feeding rates on growth performance, intestinal digestive enzyme activity, and intestinal microbial composition of red swamp crayfish ( Procambarus clarkii)

文献类型： 外文期刊

第一作者： Chen, Jinglong

作者： Chen, Jinglong;Tian, Hongyan;Zhang, Wuxiao;Xia, Silei;Gao, Jian;Wang, Aimin;Chen, Jinglong;Ming, Jianhua;Zhang, Mengyue;Li, Mingyou;Zhang, Jiahong;Kou, Xiangming;Han, Guangming;Liu, Bo;Shao, Peng;Zhu, Aimin

作者机构：

关键词： Procambarus clarkii; Feeding rate; Growth performance; Intestinal microbiota composition

期刊名称：ISRAELI JOURNAL OF AQUACULTURE-BAMIDGEH （ 影响因子：0.4； 五年影响因子：0.5 ）

ISSN： 0792-156X

年卷期： 2024 年 76 卷 4 期

页码：

收录情况： SCI

摘要： The study aimed to investigate the effects of different feeding rates on the growth, muscle composition, intestinal digestive enzyme activities, and intestinal microbiota composition of juvenile crayfish (Procambarus clarkii). A total of 240 crayfish with an initial body weight of 8.33 +/- 0.50 g were randomly distributed into five groups, and each group had three replicates. The five groups corresponded to five different feeding rates of 2%, 4%, 6%, 8%, and 10% body weight per day (BW/day). The feeding trial lasted for six weeks. The results showed that the final body weight (FBW), weight gain rate (WGR), and specific growth rate (SGR) first increased when the feed rate increased from 2% to 6 % (P<0.05) and then showed a decreased trend with the further increase of the feeding rate, but no significant differences were observed. The feed conversion ratio (FCR) increased with a rise in feeding rate, which reached a peak at the feeding rate of 10% (P<0.05). The survival rate (SR), hepatosomatic index (HSI), and condition factor (CF) were unaffected by the feeding rates (P>0.05). The moisture, crude protein, crude fat, and ash contents of crayfish muscle remained unchanged among all feeding rate groups. Intestinal activities of lipase and amylase increase with the feeding rate (up to 6%) increasing (P<0.05). The ACE and Chao indices in the groups fed at 2% of feeding rate were significantly lower than those at a feeding rate of 10% (P<0.05). The relative abundance of Firmicutes in the groups fed at feeding rates of 4%, 6%, and 8% was higher than that in other groups (P<0.05), Citrobacter in the group fed at feeding rate of 6% was lower than that in different groups (P<0.05). The intestinal microbiota primarily functions in connection to could be 6.0% of the feeding rate of juvenile P. clarkii.

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