Common skate

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Common skate
Vangst van een vleet.jpg

Common skate ( Dipturus batis )

Systematics
Subclass : Plate gill (Elasmobranchii)
without rank: Stingray (batoidea)
Order : Rajiformes
Family : Real rays (Rajidae)
Genre : Dipturus
Type : Common skate
Scientific name
Dipturus batis
Linnaeus , 1758

The common skate ( Dipturus batis ) is the largest Rays threatened (Batoidea) on European shores and extinction. Large specimens reach a length of 2.85 meters and weigh 110 kilograms. Most of the time, however, it is only 1.0 to 1.5 meters long.

According to recent analyzes, there are apparently two species, one of which is almost extinct. The two forms are provisionally designated as Dipturus cf. flossada and Dipturus cf. intermedia .

features

The common skate has a rhombic body, a brown top and a gray bottom. They have multiple eye spots on the top . The snout is pointed, the front edge of the wings clearly indented. On their tail they have a row of 12 to 18 thorns that only grow in adult animals.

distribution

Dipturus batis lives near the coast in the northeast Atlantic from Senegal to the North Cape and Iceland , in the North Sea , in the westernmost part of the Baltic Sea and in the western Mediterranean , from Gibraltar to the northern coast of Tunisia and, in the north, to the western coast of the Aegean Sea . In the Red List of Threatened Species of IUCN is considered "critically endangered" (the skate Critically Endangered classified).

Way of life

Young rays live in shallow water, adults at depths of 100 to 600 meters. They feed on benthic animals, initially small, invertebrates such as bristle worms and crustaceans, and later mainly fish such as sand eels and flatfish . The common skate mate in spring, and in summer the females lay rectangular egg capsules, initially green and later brown. The egg capsules have a holding thread at each corner and are very large with sizes of up to 24 × 14 centimeters.

Footnotes and individual references

  1. ↑ Is 80-Year-Old Mistake Leading to First Species to Be Fished to Extinction? , ScienceDaily November 17, 009 (English)
  2. ↑ Andrew M. Griffiths et al .: Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis). Proc Biol Sci. 2010 May 22; 277 (1687): 1497-1503, doi : 10.1098 / rspb.2009.2111
  3. ↑ Dipturus batis in the IUCN Red List of Threatened Species 2015.4. Posted by: Dulvy, NK, Notarbartolo di Sciara, G., Serena, F., Tinti, F. & Ungaro, N., Mancusi, C. & Ellis, J., 2006. Retrieved March 1, 2016.

literature

  • Bent J. Muus, Jørgen G. Nielsen: The marine fish of Europe in the North Sea, Baltic Sea and Atlantic. Kosmos, Stuttgart 1999, ISBN 3-440-07804-3 .

Web links

Commons : Dipturus batis  - collection of images, videos and audio files