Аннотация:The paper reports a study of sympatric morphs co-occurring in the lake and their relationships as deduced from morphoecological and genetic analyses. A new morph of the genus Salvelinus known locally as 'putoranchik' is described. This fish is a small slow-growing planktophagous form whereas the lake and the lake-river chars are large fast-growing predators distinguished mainly by their length-weight relationships, growth, feeding and spawning grounds in the lake. Sympatric morphogenesis is believed to be underlain by trophic polymorphism. Genetic similarity of the lake and the lake-river forms is confirmed by similarity of most of their morphoecological characteristics. Insignificant genetic differences between putoranchik and the predatory chars suggest the possibility of gene exchange between them