Streber

Nerd ( nerd zingel )

The nerd ( nerd zingel ) is a species of the family of Real perch ( Percidae ). It occurs in fast flowing river areas in the Danube and Vardargebiet.

Features

Nerds are slender fish that have the genre typical of the spindle perch elongated, spindle -shaped body rotating around with thin caudal peduncle. Their length is usually 12 to 18 centimeters, rarely up to 22 centimeters reached. The hull is yellow to mud brown with broad, irregularly shaped, dark brown transverse bands and light belly. The eyes are directed upward, the mouth is filled with earth and with numerous brush teeth. The scales are fixed to the body, lying along the lateral line of 70-81 small comb scales. The fins are yellowish and no drawing. The first dorsal fin has eight or nine hard jets and is separated by a clear gap of the second dorsal fin with a hard jet and 12 or 13 soft rays. The pectoral fins have no hard and 14 soft rays, the large ventral fins a rigid beam and six soft rays. The anal fin has 11 to 13, the tail 17 soft rays. The swim bladder is completely regressed.

During the spawning period, the animals are striking brass colored and the females appear very strongly built.

Way of life

Geek to live in small groups. They are nocturnal inhabitants of the base area fast-flowing waters, the day hiding in rubble or self-built mines. Consisting of small crustaceans, worms and insect larvae food is jerky at night tracked over the base jumping and swimming often with the breast and pelvic fins. The eyes can thereby be moved independently of each other and angled the head slightly to the side.

The spawning season is in March and April. The approximately 2 millimeters big sticky eggs are deposited in the gaps of gravel banks.

You can reach an age of five or more years.

Stock

The nerd is rare throughout its range. Its habitat is threatened by pollution and dam construction, since it is dependent on clean, fast flowing waters. The Berne Convention, the species is listed in Annex III, in the IUCN Red List the species is managed as not threatened.

Swell

  • Uwe Hartmann: freshwater fish. 2nd edition. Ulmer, Stuttgart 2003, ISBN 3-8001-4296-1, pp. 158-159.
  • Günther Sterba: freshwater fish from around the world. Urania, Leipzig, Jena, Berlin 1977, page 400
Perciformes Genus Karl Theodor Ernst von Siebold Fish fin Berne Convention on the Conservation of European Wildlife and Natural Habitats FishBase
751414
de