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Fins are usually the most distinctive anatomical features of a fish. They are composed of bony spines or rays protruding from the body with skin covering them and joining them together, either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Anal fin synonyms, anal fin pronunciation, anal fin translation, english dictionary definition of anal fin. N a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium. Anal fin definition is - a median unpaired fin on the lower posterior part of the body behind the vent and sometimes confluent with the caudal fin. The anal fin is found on the ventral side of fish, often, but not always, at the base of the anus. Along with the dorsal fin, the main purpose of the anal fin is stabilize the fish and keep it from rolling in the water. For knifefish (order gymnotiformes), which have neither pelvic or dorsal fins, the anal fin has an additional purpose. Anal fin (plural anal fins) (ichthyology) a fin located on the underside of a fish behind the anus. Fish anatomy is the study of the form or morphology of fishes. It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish.