What is Fin?
[[File:Lampanyctodes hectoris (Hector's lanternfish).svg|thumb|right|300px|The anatomy of ''Lampanyctodes hectoris'' <br /> 1. operculum (gill cover) 2 & 5. lateral line 3. dorsal fin 4 fat fin 6. caudal fin 7. anal fin 8. photophores 9. pelvic fins paired 10. pectoral fins (paired)]] [[Image:64 Cadillac fins.jpg|thumb|Tail fins on a [[Cadillac]] car]] A '''fin''' is a surface used to produce [[lift (force)|lift]] and [[thrust]] or to steer while traveling in [[water]], [[air]], or other [[fluid]] media. The word was first used for the limbs of [[fish]], but it is now also used to mean other animal limbs and human-made devices. The fins of fish are called: *'''[[Dorsal fin]]''' on the back. These fins keep the fish from rolling over. *'''Caudal''' or tail fin. This fin pushes the fish forward in the water. *'''Pectoral fins''' (paired). These fins help the fish steer. *'''[[Pelvic fin|Pelvic fins]]''' (paired). These fins help the fish steer. *'''Anal fin''': stability {{Biology-stub}} [[Category:Animal anatomy]]