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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 definition is - a median unpaired fin on the lower posterior part of the body behind the vent and sometimes confluent with the caudal fin. 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 (plural anal fins) (ichthyology) a fin located on the underside of a fish behind the anus. Dorsal fin flanked basally by 10-12 half-scales, anal fin flanked by 8-10 half-scales, remainder of dorsal and anal fins without scales 3 large, diamond-shaped scales covering pelvic-fin bases, pelvic fins flanked laterally by 6 half-scales, remainder of pelvic fin and pectoral fin without scales 7 rows of body scales extending onto base of caudal fin upper and lower caudal lobes each with. Anal fin rays anal fin base anal fin consists long anal fin anal fin origin anal fin originates modified anal fin anal fin ray dorsal fin anal fin anal fin ering anal fin also anal fin soft longer anal fin anal fin lobe anal fin lobes. Three spines on the anal fin of a bony fish a fin-spine one of the unjointed and unbranched sharp bony rays of the fins, such as those the presence. Anal definition is - of, relating to, situated near, or involving the anus.