On the basis of the morphometric analysis of the variability of the white-fish Coregonus lavaretus of Sevan Lake, it was revealed that a comparatively homogeneous population of this fish has been formed there by the beginning of the XXI century. It is suggested that the unstable hydroecological regime of the lake and the anthropogenic pressing on the population of the white-fish can influence on the formation of new morphological and ecological features of this fish in the future. At the same time, taking into account the evolutionary youth of the white-fish of Sevan Lake and incompleteness of the processes of its formation, it is suggested to consider this fish as an ecological form of Coregonus lavaretus without certain taxonomic status.
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