Coregonus 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.

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