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Epinephelus marginatus, Serranidae (sea basses), dusky grouper, Aulostomus strigosus, Aulostomidae (trumpetfishes), East Atlantic trumpetfish, bony fishes, behavior, interspecific relationships, symbiosis, commensalism, underwater, El Hierro Island, Canary Islands, Spain, Atlantic Ocean.

Remarks: Unlike other predators, the trumpetfish feeds on small fishes. The trumpetfish take adventage of this circumstance to be unnoticed by hiding behind other fishes. In this way it gets close to small preys which do not see a threat on other predatos or on herbivorous fishes.