Rhodobacteraceae strains are known to play multiple beneficial roles in shrimp aquaculture. Roseovarius litoreus (RL), a member of this family, has demonstrated probiotic effects in crabs. To explore its potential role in shrimp, this study evaluated the effects of RL on the growth performance, antioxidation, and gut bacterial community of the postlarvae of shrimp Litopenaeus vannamei in an 8‐week immersion supplementation experiment. The results revealed that RL significantly increased the weight gain rate (WGR, p < 0.0001) and specific growth rate (SGR, p < 0.0001) while suppressing the mRNA expression of muscle MSTN ( p < 0.001), a gene involved in muscle growth regulation. Although RL did not markedly affect superoxide dismutase (SOD) activity, total antioxidant capacity (T‐AOC), or malondialdehyde (MAD) levels, it significantly enhanced catalase (CAT) activity. Additionally, RL modulated the gut bacterial community, notably reducing zero‐radius operational taxonomic unit (ZOTU) richness and enriching beneficial genera such as Lysobacter , Bacillus , and Ruegeria . Functional profiling indicated that these enriched ZOTUs were associated with enhanced development and regeneration, digestive system function, and immune responses. In summary, this study suggests that RL holds promise as a probiotic candidate for shrimp aquaculture.
Wang et al. (2026) studied this question.