Effects of phosphorus on growth, biochemical parameters and intestinal microbiota of the juvenile hybrid of Acipenser baerii ♀×Acipenser schrenckii ♂

• Published in: Aquaculture Reports
• Main Authors: Zhipeng Chu, Jiali Jin, Luoxin Li, Wenbo Zhou, Yucong Hong, Wei Liu, Rui Ruan, Yan Li, Jianwei Sun, Yi Chai, Chuangju Li
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2024
• Subjects: Hybrid sturgeon; Phosphorus; Growth; Serum biochemical; Intestinal microbiota; Aquaculture. Fisheries. Angling; SH1-691; Acipenser baerii
• Online Access: https://doi.org/10.1016/j.aqrep.2024.102152; https://doaj.org/article/8f78b9a7f9e74a3d88aee4758595bc25

Phosphorus (P) plays a vital role in fish life and its application in aquatic feed deserves thoroughly study. To evaluate the effects of dietary P on growth performance, serum biochemical parameters and intestinal microbiota of the juvenile hybrid of A. baerii♀ × A. schrenckii♂, five diets containing 3.7, 6.5, 9.6, 12.2 and 14.8 g/kg of available phosphorus (AP) were assigned to feed fish at initial weight of 10.06 ± 0.39 g for 8 weeks. The results showed that weight gain (WG) of juvenile hybrid sturgeon was improved significantly with dietary AP level up to 9.6 g/kg. Feed efficiency (FE) and P digestibility of fish were significantly enhanced by P supplementation, but were dropped when dietary AP level further increased to 12.2 and 14.8 g/kg. Alkaline phosphatase (ALP) activity increased firstly and then slightly decreased at a stable level in the high dietary AP groups (12.2 and 14.8 g/kg). With dietary AP level increasing, significantly decrease of the content of triglyceride (TG), total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C) in serum were observed. Serum antioxidant indicators including superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px) and total antioxidant capacity (T-AOC) exhibited the improved activity by addition P in diet. Intestinal microbiota analysis indicated that the supplementation of P in diet increased the richness and diversity of bacteria communities. Cyanobacteria was the dominant phyla in the intestine of hybrid sturgeon, and was significantly increased in P addition group. Compared with the basal diet group, abundant genera in dietary P supplementation group exhibited a higher diversity and were composed of Clostridium, Cetobacterium, Bacteroides, Empedobacter, Ruminococcus, Faecalibacterium, Rhodococcus and Candidatus Arthromitus. In conclusion, appropriate dietary P supplementation could positively affect the growth, biological processes and intestinal microbial communities of fish, and a ...