Upper Yenisei grayling explained

Thymallus svetovidovi, also known as the Upper Yenisei grayling, is a species of freshwater fish in the salmon family. It is found in the upper reaches of the Yenisei River and in western Mongolia.^[1]

Description

The body of Upper Yenisei grayling is mostly grayish-black, with dark dorsum and white abdomen.^[2] There are two weakly pronounced parallel brownish yellow stripes running from the throat to the ventral fins. Beyond gill cover to the insertion of the seventh unbranched ray of dorsal fin, eight small black spots of different shapes with a diameter of 1–3 mm are scattered.^[3]

The Upper Yenisei grayling can reach a maximum recorded length of 39.6 cm (15.6 inches).^[4]

Notes and References

1. Ponomareva . E. V. . Volkov . A. A. . Ponomareva . M. V. . Shubina . E. A. . MtDNA Analysis of the Upper Yenisei Grayling (Thymallus svetovidovi) and the Mongolian Grayling (Thymallus brevirostris) and Clarification of Their Ranges . Biology Bulletin . December 2022 . 49 . 6 . 721–726 . 10.1134/s1062359022060139 . 30 November 2023.
2. Froufe . E. . Knizhin . I. . Weiss . S. . Phylogenetic analysis of the genus Thymallus (grayling) based on mtDNA control region and ATPase 6 genes, with inferences on control region constraints and broad-scale Eurasian phylogeography . Molecular Phylogenetics and Evolution . 1 January 2005 . 34 . 1 . 106–117 . 10.1016/j.ympev.2004.09.009 . 30 November 2023 . 1055-7903.
3. Knizhin . I. B. . Weiss . S. J. . A new species of grayling Thymallus svetovidovi sp. nova (Thymallidae) from the Yenisei basin and its position in the genus Thymallus . Journal of Ichthyology . 1 January 2009 . 49 . 1 . 1–9 . 10.1134/S0032945209010019 . 30 November 2023 . en . 1555-6425.
4. Ponomareva . E. V. . Volkov . A. A. . Ponomareva . M. V. . Shubina . E. A. . MtDNA Analysis of the Upper Yenisei Grayling (Thymallus svetovidovi) and the Mongolian Grayling (Thymallus brevirostris) and Clarification of Their Ranges . Biology Bulletin . 1 December 2022 . 49 . 6 . 721–726 . 10.1134/S1062359022060139 . 30 November 2023 . en . 1608-3059.