PRECISION PROBIOTICS IN AQUACULTURE: A SYSTEM AND METHOD FOR TAILORING BENEFICIAL MICROBES FOR SPECIES-SPECIFIC HEALTH AND PRODUCTION

Abstract

Aquaculture now supplies more than half of all fish consumed by humans worldwide, and its continued expansion is constrained by recurring disease outbreaks, inconsistent growth performance, and mounting pressure to curb antimicrobial use. Probiotic supplementation has long been proposed as an ecologically sound alternative to antibiotics, yet first-generation probiotic products often generic, terrestrially derived strains applied uniformly across species—have delivered inconsistent field results. This review examines the emerging paradigm of precision probiotics: host-adapted, mechanistically characterized microbial formulations designed around the physiology, gut ecology, immune architecture, and production environment of a specific aquatic species or life stage. We synthesize current understanding of host–microbiome interactions in finfish, crustaceans, and mollusks; describe the molecular and ecological mechanisms through which candidate probionts confer benefit; and outline how genomics, metabolomics, culturomics, machine learning, and genome-editing tools are converging to enable rational strain selection and formulation design. Species-specific case examples in salmonids, tilapia, carp, shrimp, and bivalves illustrate both the promise and the constraints of this approach. We also address the regulatory, ecological, and commercial barriers to scaling precision probiotics—including strain stability during processing, colonization competition with resident microbiota, biosafety of genetically modified strains, and the absence of harmonized international standards. We conclude that precision probiotics represent a necessary evolution beyond one-size-fits-all supplementation, but that translating laboratory-validated consortia into robust, farm-ready products will require sustained investment in mechanistic research, standardized efficacy testing, and regulatory frameworks that keep pace with the underlying science.