Special Traits of the Population Structure of Alien Fish Species in the Kuybyshev Reservoir

摘要

The data on the time of invasion of ahen flsh species into the Kuybyshev Reservoir are presented, as well as their sex and age composition. All alien fish species in the Kuybyshev Reservoir are short-cycle ones; their maximum age is no longer than five years. The species that invaded the reservoir earlier predominantly have a settled sex and age structure with domination of females or equal sex ratio. The species that invaded the reservoir later are distinguished by domination of males.