Characters of native hybrids of bream Abramis brama (Linnaeus, 1758) and roach Rutilus rutilus (Linnaeus, 1758) in Rybinsk reservoir

Shows morphological characteristics and the occurrence of hybrids of bream and roach in the Rybinsk Reservoir. By means of a method of principal components, identification of hybrids of a bream and a roach on a complex of heterogeneous morphological characters is spent. The recommendation about primary definition of the given hybrid under natural conditions is given.