Ammersee-Kilch

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Ammersee-Kilch
Systematics
Cohort : Euteleosteomorpha
Order : Salmonid fish (Salmoniformes)
Family : Salmon fish (Salmonidae)
Subfamily : Coregoninae
Genre : Coregonus
Type : Ammersee-Kilch
Scientific name
Coregonus bavaricus
Hofer , 1909

The Ammersee Kilch ( Coregonus bavaricus ) is a rare species of fish from the Coregonus genus , which was first scientifically described by Bruno Hofer . He is in the Bavarian Ammersee along the villages Dießen , Utting and Schondorf endemic .

features

The Ammersee-Kilch has a standard length of 241 to 245 mm. The number of gill traps is 18 to 30. The short pectoral fin reaches the edge of the mouth when it is folded forward. The head and fins are short. The mouth is almost terminal and the upper jaw reaches the front edge of the eye. The muzzle is blunt. The body and fin color of specimens preserved in ethanol is silvery yellow. In an individual caught in 2003, the pectoral fin has a light gray tinge.

Habitat and way of life

The deep waters of the Ammersee are the only habitat of the Ammersee-Kilch in the world

The Ammersee-Kilch inhabits the deeper waters of the Ammersee down to depths between 60 and 85 meters. In summer they remain at depths of 60 meters. The spawning season is usually between June 15th and July 15th. The spawn is deposited on the bottom at depths between 40 and 50 meters.

Danger

In 1909 the Ammersee-Kilch was still described as an economically important food fish. In 1933 the German ichthyologist Erich Wagler found out during studies at the Ammersee that the population of this species had collapsed, which was mainly due to the overfishing of the smaller individuals. Wagler also noted that straightening the Ammer tributary would have had a negative impact on the living conditions of the Ammersee-Kilch. At the beginning of the 1950s, the Ammersee was severely eutrophicated . With the construction of a ring canal in 1971, which keeps waste water out of the Ammersee, the water quality could be improved again. Today the population has probably stabilized at a very low level. Only three specimens were caught between 1951 and 2003. The IUCN classifies the Ammersee-Kilch into the category of " threatened with extinction " (critically endangered) a.

Individual evidence

  1. ↑ a b Erich Wagler: The Coregonen in the lakes of the foothills of the Alps. VII. The kilch of Lake Constance ( Coregonus acronius von Rapp) . Int. Rev. Hydrobiol. Hydrogr., 30: 1-48.

literature

  • Maurice Kottelat: European Freshwater fishes. An heuristic checklist of the freshwater fishes of Europe (exclusive of former USSR), with an introduction for non-systematists and comments on nomenclature and conservation . Biologia (Bratislava) Sect. Zool., 52 (Suppl.). 1997.
  • Jörg Freyhof: Redescription of Coregonus bavaricus Hofer, 1909 from Lake Ammersee, Bavaria (Salmoniformes: Coregonidae) . In: Cybium 2005, 29 (2) : p. 179-183. Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany. ( PDF full text )
  • Maurice Kottelat & Jörg Freyhof: Handbook of European Freshwater Fishes . 2007, ISBN 978-2-8399-0298-4 .

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