Dorsal fin
Dorsal Fin
The Dorsal Fin (/ˈdɔːrsəl fɪn/; from Latin dorsum meaning "back") is a fin located on the backs of various marine and freshwater vertebrates including most fish, certain species of dolphins, and whales.
Etymology
The term "Dorsal Fin" originates from the Latin word dorsum, which translates to "back". The term "fin" is derived from the Old English finn, which means "fin".
Function
The primary function of the dorsal fin is to stabilize the animal against rolling and assist in sudden turns and stops. In some species, the dorsal fin also serves as a keel, cutting through the water and reducing drag.
Anatomy
The anatomy of the dorsal fin varies among species. In most cases, it consists of a thin, flat structure composed of bony or cartilaginous spines (rays) covered by skin and, in some cases, scales. The number, shape, and size of these rays can vary greatly between species.
Related Terms
- Caudal Fin: The tail fin of a fish.
- Pectoral Fin: Fins located on the sides of a fish, often used for steering and balance.
- Pelvic Fin: Fins located on the underside of a fish, often used for stability.
- Anal Fin: A fin located on the underside of a fish, behind the anus, often used for stability.
External links
- Medical encyclopedia article on Dorsal fin
- Wikipedia's article - Dorsal fin
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