Comparative characteristics of the gender-age structure of Thymallus arcticus of the Kazyr river (r. Yenisey basin)

The article provides data on Thymallus arcticus, which was caught in the fall (end of October) 2020 from the Kazyr River (Krasnoyarsk Territory). The sex and age characteristics of Siberian grayling are analyzed. Also, a comparison was made between the data on Thymallus arcticus from this work with the data from another work (the fish was caught in August). The information and the location are new to research.