Detoxifying and depolymerizing microorganisms reveal intertwined guild collaborations in the gut microbiome of the generalist macro-algivorous fish Kyphosus cinerascens.

Microbial guilds in Kyphosus cinerascens gut microbiome sequentially degrade macroalgal polysaccharides and polyphenols, revealing key cooperative dynamics in biomass breakdown.

• Why it matters: Understanding these microbial interactions is crucial for developing sustainable methods to convert seaweed biomass into useful products, addressing current industrial limitations.
• What they did: The study used in vitro microcosms based on the fish's gut microbiome, employing metagenomic and metatranscriptomic analyses to track active microbial taxa and their enzymatic functions during macroalgal biomass transformation.
• The result: Findings show distinct microbial groups act in succession—initial detoxification and alginate degradation by Gammaproteobacteria, followed by other taxa targeting recalcitrant polysaccharides—enabling discovery of novel enzymes and pathways for biomass utilization.