What is Dorsal fin?
[[File:Aileron de requin.jpg|thumb|200px|right|Dorsal fin of a [[shark]]]] A '''dorsal fin''' is a [[fin]] on the back of most [[Ocean|marine]] and [[Fresh water|freshwater]] vertebrates. The main function of the fin is to stabilize the animal against rolling and to help sudden turns. There are some secondary functions: some fish have dorsal fins which produce [[venom]] at the tip, for example, the [[spiny dogfish]]. == Functions == Some species have further adapted their dorsal fins to other uses. [[Category:Animal anatomy]] [[Category:Fish]]