Sucker fish

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a large blue shark swimming in the ocean

The remora, aka shark sucker or sucker fish is a commensal fish who spends its life attached to or swimming next to sharks, rays, and other large oceanic creatures. There are 8 known species of remora distributed throughout the oceans around the world. This fish has an oval suction disk on top of it’s head that that has several paired, crosswise-oriented plates. This disk is actually an evolved dorsal fin. These aquatic hitchhikers are listed as Least Concern by the IUCN.

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a fish that is swimming in the water

The live sharksucker (Echeneis naucrates) has developed a sucker on the back of its head with which it sticks to big fishes, marine mammals, turtles, ships and even divers. The live sharksucker eats parasitic crustaceans from the latter, food scraps from the feeding activity of its host, or some small food caught by filtering the water through its villiform teeth while the navigating on its host

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