Double dorsal fin
| Double dorsal fin | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Double dorsal fin ( Enoplosus armatus ) |
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| Systematics | ||||||||||||
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| Scientific name of the family | ||||||||||||
| Enoplosidae | ||||||||||||
| Gill , 1893 | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Enoplosus | ||||||||||||
| Lacepède , 1802 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Enoplosus armatus | ||||||||||||
| ( White , 1790) |
The double dorsal fin ( Enoplosus armatus ) is a species of the perch relatives (Percomorphaceae). The fish is endemic to the coast of southern Australia , where it is known as the "Old Wife". It is monotypical in its genus and in the family Enoplosidae.
features
Double dorsal fins have a high back body with a relatively small head, a slightly above, pointed mouth and a two-part dorsal fin with powerful fin rays . The first dorsal fin is supported by eight hard rays, the second by one hard and 14 to 15 soft rays. The anal fin has three hard and 14 to 15 soft rays. The pelvic fins are noticeably large and have a strong first fin ray. Double dorsal fins are of a silvery basic color and have several vertical stripes of different widths on their flanks, fins and head. They have 26 vertebrae and are up to 50 centimeters long.
Way of life
Double dorsal fins live in small schools, in pairs or individually, over rocky reefs and sea grass meadows down to depths of 90 meters. Fishes that are not yet fully grown live in estuaries. The fish feed on crustaceans , worms and algae.
Fossil record
A fossil relative, Enoplosus pygopterus, is known from the middle Eocene of the northern Italian Monte Bolca formation, which arose from Tethys deposits .
Individual proof
- ^ Karl Albert Frickhinger: Fossil Atlas Fish , Mergus-Verlag, Melle, 1999, ISBN 3-88244-018-X
literature
- Joseph S. Nelson : Fishes of the World. John Wiley & Sons, 2006, ISBN 0-471-25031-7 .
Web links
- Double dorsal fin on Fishbase.org (English)