文献类型：期刊文献

英文题名：Synergistic effects of biofloc and astaxanthin on pigmentation, immunity, and intestinal microbiota of Litopenaeus vannamei

作者：Wu, Jia-Qi[1];Wang, Fu-Rui[1];Zhu, Miao[1];Sun, Cheng-Bo[1,2]

机构：[1]Guangdong Ocean Univ, Coll Fisheries, Zhanjiang 524088, Guangdong, Peoples R China;[2]Guangdong Prov Key Lab Pathogen Biol & Epidemiol A, Zhanjiang 524000, Peoples R China

年份：2026

卷号：48

外文期刊名：AQUACULTURE REPORTS

收录：SCI-EXPANDED(收录号：WOS:001782144000001)、、EI(收录号：20260119918)、Scopus(收录号：2-s2.0-105039648998)、WOS

基金：This study was supported by the National Key R & D Program of China (No. 2023YFD2401703) .

语种：英文

外文关键词：Litopenaeus vannamei; Biofloc technology; Astaxanthin; Intestinal microflora; Bioavailability

外文摘要：The impact of dietary astaxanthin (AST) levels on the growth performance, pigment deposition, immune function, and gut microbiota of Litopenaeus vannamei reared under biofloc technology (BFT) and clear-water systems was systematically investigated in this work to evaluate the potential synergistic effects between BFT and dietary AST. Along these lines, shrimps with an initial body weight of 3.94 +/- 1.58 g were fed diets supplemented with 0, 60, 80, 100, or 120 mg/kg AST and cultured for 35 days under either BFT or clear-water conditions. From our analysis, it was demonstrated that: (1) the interaction between the culture mode and AST level (Model & times; AST) significantly affected shrimp's survival rate and weight gain rate (WGR) (P < 0.05). A quadratic regression model based on WGR was applied, yielding a theoretical optimum AST level of 91.77 mg/kg under BFT conditions; (2) the deposition of AST in tissues was affected by both culture mode and dietary AST level; however, a significant interaction between these factors was detected only for the AST content in the uropod (P < 0.05); (3) various body colour parameters, immune enzyme activities, and antioxidant capacity all exhibited significant interactive enhancement effects (P < 0.05), with the B80 group showing the best overall performance;and (4) gut microbiota analysis indicated that BFT and AST jointly altered the composition and predicted functions of the intestinal microbiota and the B60 group showing greater enrichment in immune-related predicted functional categories.In conclusion, BFT enhanced dietary AST utilization in L. vannamei, supporting comparable or superior culture performance at lower AST supplementation levels relative to clear-water conditions. Despite a theoretical optimum of 91.77 mg/kg AST derived from quadratic regression of WGR under BFT conditions, an 80 mg/kg supplementation level is recommended as optimal in practice when integrating growth, tissue AST deposition, coloration, immune, and economic considerations.