Feces from coral-eating fish may act as 'probiotics' for reefs

Until recently, fish that eat coral—corallivores—were thought to weaken reef structures, while fish that consume algae and detritus—grazers—were thought to keep reefs healthy. But scientists have discovered that feces from grazers leave large lesions on coral, possibly because they contain coral pathogens. By contrast, feces from corallivores may provide a source of beneficial microbes that help coral thrive.

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