Еуропалық цизоның түрлері және таралуы

Species of fish

Coregonus albula, known as the vendace or as the European cisco, Lithuania, Sweden, Russia and Estonia, and in some lakes of Norway, the United Kingdom, northern Germany, and Poland. It is also found in diluted brackish water in the Gulfs of Finland and Bothnia, both of which are in the Baltic Sea. The length of an adult is normally about The maximum age is about ten years.

Vendace mainly feed on zooplankton, such as small crustaceans and their larvae, but larger fish also feed on floating insects and fish fry. The fish live in schools made up of large groups of individuals. They lay their eggs on pebbly or sandy ground, some in shallow water and others at depths of down to The fish mature at a young age and most spawn for the first time in their second year, but a few may breed in their first autumn. Within the vendace, taxonomic subdivisions have been suggested both on geographical grounds and between sympatric ecotypes. FishBase lists the British populations of vendace as a separate species, Coregonus vandesius, but this distinction is not accepted by all scientists. Coregonus albula generally breeds in the autumn, but in several North European lakes distinct spring spawning populations of vendace exist, some of which have been described as separate species: in Sweden, as Coregonus trybomi, and in two lakes of northern Germany, as Coregonus fontanae and Coregonus lucinensis. These populations are sympatric with autumn spawning vendace and seem to have evolved post glacially from them independently in each lake.