Release:2016, Vol. 2. №4
About the authors:Innokentii S. Nekrasov, Instructor, Department of Zoology and Evolution Ecology of Animals, Tyumen State University; firstname.lastname@example.org
The article provides the dimensional and weight characteristic of a lake (benthophagic) form of the Mongolian grayling in a mountain cold water reservoir of Tuva. The reproductive potential of a grayling is studied. It is established that the females mature at the age of 4+, and the peak of spawning activity is observed in 5+. The males mature a year before females. In ovaries of the sexually mature fishes during the summer period, the senior generation of gametes is the cytoplasm vakuolization phase of oocytes; the next generations are represented by numerous previtellogenous oocytes; an insignificant part of females passes the next spawning season. In the testis a wave of spermatogenesis passes.