Abstract
The Siberian anglerfish (Salamandrella keyserlingii) has until now been considered a rare species for the region under consideration, as well as for the whole of Northern Kazakhstan. Studies of teachers and students of M. Kozybayev University, conducted in different parts of the region, allowed to refute these ideas. First of all, it was found that the typical habitats of the anglerfish are damp and swampy places in the floodplain of the Ishim River, as well as similar areas in watershed territories. In suitable biotopes, the population density of the anglerfish reaches 18 individuals per 1 square meter, with an average of 1-2 individuals. Trapping and studying the morphology of the anglerfish allowed us to determine insignificant parameters of variation of the main indicators characterizing the sizes of adults and young individuals. Moreover, they practically did not differ from similar ones for other territories.