Zingel asper

Rhone- nerds ( Zingel asper ) in the Loue

The Rhone- nerds ( Zingel asper ), called in Switzerland apron or Roi du Doubs, is a fish of the family of the Real perch ( Percidae ).

Description

The 15 to 22 -inch-long fish has a slender and spindle-shaped body like all spindle perch. The mouth is inferior, the caudal peduncle shorter than in the close to him nerd. The light-brown to gray color shows three irregular dark bars on the rear body. The belly is white in color.

• Fins formula: Dorsal 1 VIII -IX, dorsal I/i-ii/9-12 2 ½, Anal I-III/8-12, caudal 17
• Dandruff formula: SL 57-65 3-6.

Occurrence

The occurrence is limited to the French and Swiss Rhone basin. The distribution area of a total of less than 10 km ² consists of four non- interconnected areas: Only a few live in the Drôme, in the Durance is around 200 and in Beaune and about 80 in 2012 resulted in a count in the upper part of the Doubs for the stock in Switzerland only 52 copies.

The type is a result of water pollution and water withdrawal back into their already low inventory. The IUCN classified along with 1990 and 1994 as " Endangered " ( high risk ) and in 1996 as " Critically Endangered " ( threatened with extinction ). The Swiss Fisheries Association (SFA ) has the Rhone- geek declared a fish of 2013 to make the public aware of the threat of extinction of the species.

Way of life

The daytime sluggish Rhone- nerd is exclusively nocturnal active. He lives at the bottom in waters of 30 to 80 centimeters deep with moderate flow and feeds on benthic animals of all kinds spawning season is from March to April. The short-lived species reaches an age of approximately 3.5 years.