Linear growth of Balkhash perch Perca schrenki Kessler in the waters of the Balkhash-Ili basin

Balkhash perch (Perca schrenki Kessler), being endemic to the Balkhash-Ili basin in the late 60 s of the last century, has lost its commercial value in Lake Balkhash. Currently, the population of this species, entered into the Red Book of the International Committee on Nature Protection and the Red Book of Kazakhstan, is gradually restored. This fact conditioned the resumption of monitoring studies in the course of which it was confirmed that at present time the Balkhash-Ili perch population is characterized by a definite growth delineation of the fast growing lake (pelagic) and slow growing reed (coastal) ecological forms.