Rheingroppe

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Rheingroppe
Cottus gobio (in situ) .jpg

Rhine drop ( Cottus rhenanus )

Systematics
Order : Perch-like (Perciformes)
Subordination : Cottoidei
Partial order : Bull relatives (Cottales)
Family : Bullheads (Cottidae)
Genre : Cottus
Type : Rheingroppe
Scientific name
Cottus rhenanus
Freyhof , Kottelat & Nolte , 2005

The Rheingroppe ( Cottus rhenanus ) is a small freshwater fish , also found in Germany , which originally only lived in the river basin of the Rhine .

features

The Rheingroppe reaches a maximum length of about 9.5 cm. The species differs from other species of the same genus in that it does not have a continuous band on the anal fin and the body is not speckled with spiky, degenerated scales (sometimes a speckle occurs under the pectoral fin ). At the base of the first dorsal fin , the fish has weak black spots. In addition, there are molecular data that confirm the species status of the species that was first described in 2005.

Way of life

The Rheingroppe lives in fresh water and is found here mainly on the bottom of the water and in the lower water layers of the rivers (benthopelagic). It is considered to be less demanding and is especially adapted to cold water in the temperate climate zone. The reproduction rates are very high, a doubling of the population in less than 15 months.

Emschergroppe

Two populations of the species living in the Brabecker Mühlenbach, a tributary of the Boye in the Emscher system on the Lower Rhine, were recorded as "Emschergroppe" by Robert Donoso-Büchner. The animals are genetically indistinguishable from the typical Rheingroppe using markers from mitochondrial DNA , but there should be slight morphological differences. Accordingly, the "Emschergroppe" would most likely be a somewhat differentiated local population of the Rheingroppe, which only survived in a relict population due to the canalization and pollution of the Emscher and its tributaries. The Emschergenossenschaft has resettled the "Emschergroppe" in the renatured Emscher and its tributaries in order to maintain the population.

See also

literature

  • J. Freyhof, M. Kottelat, A. Nolte: Taxonomic diversity of European Cottus with description of eight new species (Teleostei: Cottidae). Ichthyological Exploration of Freshwaters 16, 2005: pages 107-172.

Individual evidence

  1. ↑ Robert Donoso-Büchner: The Emscher group Cottus cf. rhenanus. Fischfauna-online.de, discontinued on December 28, 2013.
  2. ↑ https://www.mengede-intakt.de/2018/08/24/kaum-zu-glauben-lebende-fische-in-der-emscher/ .
  3. ↑ https://www.waz.de/staedte/essen/die-seltene-emschergroppe-kehrt-nach-essen-zurueck-id211682473.html

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