Sargassum

Sargassum is a genus of brown (class Phaeophyceae) macroalgae (seaweed) in the order Fucales.

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Perfect 'pathogen' storm: Vibrio bacteria, Sargassum and plastic marine debris

Whale sharks may be the world’s largest omnivores. New research shows that the floating macroalgae, Sargassum, is a significant source of food for the species which has previously been observed eating plankton, including krill, copepods, crab larvae, tiny squid or fish.