Figure 2.

Host-microbial load under health and dysbiosis. Addition in diet of exogenous microbial sources may increase fish health through a host–microbe positive loop. Commensal gut microbes might be modulated by dietary administration of target microbes, non-digestible elements, or a mix of both. Expected output should turn in preventive or curative strategies. The use of pro-, pre-, and/or synbiotics is expected to restore the homeostatic stage. Assessment of the selected approach might be quantified, modeled, or dissected using omics tools, germ-free models, and microbiome analyses.