Exploring the gut microbiota and metabolome of Lateolabrax japonicus: A multi-omics approach☆

The intestinal microbiota plays a crucial role in the health and development of fish, engaging in intricate interactions with the host organism. As a significant species in aquaculture, Lateolabrax japonicus serves as an exemplary model for investigating these interactions and their subsequent effects on growth and health. This study utilized a multi-omics approach, incorporating metagenomic sequencing and non-targeted metabolomics, to delineate the gut microbiota and metabolome of L. japonicus throughout various developmental phases. Collected from a meticulously controlled aquaculture setting, the intestinal microbiota of L. japonicus underwent high-throughput sequencing to scrutinize microbial DNA and enumerate metabolites. The metagenomic analysis uncovered a heterogeneous gut microbiota in L. japonicus, predominantly composed of Proteobacteria and Firmicutes, with marked heterogeneity in microbial composition across developmental stages. A particularly noteworthy discovery was the prevalence of the genus Acinetobacter, which may significantly influence health and disease resistance. The metabolomic profiling discerned 4479 metabolites, each exhibiting pronounced stage-specific metabolic signatures, particularly within lipid, amino acid, and energy metabolism pathways. The correlation analysis between microbiota and metabolites highlighted the substantial impact of specific genera, such as Acinetobacter and Gaeumannomyces, on the metabolic milieu. This study provides a comprehensive overview of the dynamic shifts in the gut microbiota and metabolome of L. japonicus, highlighting stage-specific transitions that could be pivotal for refining aquaculture practices. The findings underscore the complex interdependence between microbiota composition and metabolic function, providing valuable insights into the modulation of fish health and growth.