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The main function of the dorsal fin in any animal with a dorsal fin is stability. Some fish have adapted for using the dorsal fin for other uses, such as propulsion in the Sunfish. The anglerfish's dorsal fin has evolved to work as a fishing pole so that the fish can bait and catch their prey.

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What are the structures of fish?

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Dorsal means pertaining to the rear or posterior surface. Pertaining to the back. Dorsal mean on or toward the back … as the Dorsal Fin of a fish runs down the center of its back.


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