Coregonus gutturosus

Lake Constance whitefish (Coregonus gutturosus )

The Lake Constance whitefish (Coregonus gutturosus ) is a most likely extinct freshwater fish of the genus Coregonus. It occurred in the deeper areas of Lake Constance.

Features

The Lake Constance whitefish reached a standard length of 290 mm and a weight of 125 grams. The mouth opening was under constant. The snout was blunt. The back was olive green or brown. The number of gill rakers on the first arch was 14 to 25

Way of life

The spawning season of the Lake Constance Kilchs was from July to November. The eggs were stored in 10 to 60 meters depth. After spawning, the Kilche wintered at deeper places between 100 and 140 meters. Between March and April the fish rose again up to their ancestral areas between 50 and 60 meters. In summer, the food of bivalves and gastropods of the lake bottom was. In the winter, the Lake Constance whitefish fed from the spawning of blue Felchens.

Kilche prisoners were severely disfigured in the rule. By pulling up from deep inside the belly was so distended that he even could burst due to the falling water pressure and consequent excessive expansion of the trapped air in the swim bladder.

Extinction

In the 1950s, the eutrophication of Lake Constance, which led to a sharp decrease in the oxygen content and was responsible for ensuring that the eggs of many coregonids no longer able to develop began. While the holdings of other Coregone species in Lake Constance recovered by increasing, the Lake Constance whitefish probably died out in the 1970s.

System

The Lake Constance whitefish was described in 1818 by Johann Friedrich Gmelin first as a subspecies Salmo muraena gutturosa. In the same year he received under the name Coregonus gutturosus species rank. 1854 Taxon by Wilhelm Ludwig von Rapp ( 1794-1868 ) was renamed and expanded the definition of species Coregonus acronius to the various whitefish populations of Lake Attersee, of Lake Geneva and the Ammersee. 1997 used Maurice Kottelat finally back Gmelins original epithet and limited the concept of species on the Kilche from the deeper waters of Lake Constance.