Dryagin’s Char Salvelinus drjagini Logaschev Sobachie Lake (Putorana Plateau)

Abstract

The results of studies of some morphological, size-age and demographic characteristics of Dryagin char are presented. A distinctive feature of this char from the Boganid char common in Lake Sobachye is a wide body. Its height in mature fish reaches 27.9% of the body length. Dryagin’s char has 112–133 (121.6) perforated scales in the lateral line, 21–29 (26.11) rakers on the first gill arch. The Dryagin char differs from the Boganid char in the color of immature and adult fish. In the control catches, fish aged from 3 to 14 years were noted, fish aged 8–10 years dominated. The length of Dryagin’s char (SL) ranged from 318 to 810 mm, weight — 472–10 700 g. The sex ratio was approximately 60:40 in favor of males. At the age of 6 years, the fish reaches sexual maturity, the maturation period is extended to 8–9 years. The minimum values of individual absolute fecundity in char were noted at the age of 6 years — 3833, the maximum — 18 270, the average value of the trait — 8140 eggs. The value of fecundity functionally depends on the mass of the fish (correlation coefficient 0.83) and its size (correlation coefficient 0.77). It is concluded that the large size, with almost the same maturation time of Dryagin char and Boganid char, makes the former a more preferable object for introducing native species into aquaculture for the Krasnoyarsk Territory.