The planktivorous damselfish, Yellow-tail Dascyllus (Dascyllus flavicaudus), feeding above their branching coral host, Pocillopora eydouxi. The fish shelter among the branches of their coral host when threatened by predators during the day and throughout the night. Skeletal growth of Pocillopora colonies increases with increasing number (biomass) of sheltering damselfish, which is related to increased concentrations of nitrogenous wastes that are excreted by fishes and taken up by the coral. Credit: Melissa H. Schmitt

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