Whitefish of the family Salmonidae that occurs in the Baltic Sea basin - in the sea itself and the inflowing rivers, and in several lakes as landlocked populations. It is found in Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Netherlands, Norway, Poland, Slovakia Ã
 trbské pleso, Russia and SwedenCoregonus is a diverse genus of fish in the salmon family Salmonidae. The Coregonus species are known as whitefishes. The genus contains at least 68 described extant taxa, but the true number of species is a matter of debate. The type species of the genus is Coregonus lavaretus.
Most Coregonus species inhabit lakes and rivers, and several species, including the Arctic cisco C. autumnalis, the Bering cisco C. laurettae, and the least cisco C. sardinella are anadromous, moving between salt water and fresh water.
The genus was previously subdivided into two subgenera Coregonus `true whitefishes` and Leucichthys `ciscoes`, Coregonus comprising taxa with sub-terminal mouth and usually a benthic feeding habit, Leucichthys those with terminal or supra-terminal mouth and usually a pelagic plankton-feeding habit. This classification is not natural however: based on molecular data, ciscoes comprise two distinct lineages within the genus. Moreover, the genus Stenodus is not phylogenetically distinct from Coregonus
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