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Lena (Baikal-Lena) grayling (Thymallus baikalolenensis)

The range of this grayling species is divided into several parts; this fish is widespread in the tributaries of several unconnected rivers of the Eastern Siberia. The Baikal-Lena grayling is dwelling in some tributaries of the north-eastern part of the Lake Baikal (Tyya, Upper Angara and Barguzin) and in many tributaries of the Lena River. This grayling species in the summer prefers to stay in small streams, and only during the onset of cold weather it migrates down into the main river for wintering.

On the territory of the Khabarovski Krai, its range includes the river basins of the Yudoma and Maya-Lenskaya. In addition, it was discovered in the upper part of the Maya-Udskaya River (a tributary of the Uda River in the Okhotsk Sea basin). In the Amur basin, this species was found in the tributaries of the Bureya and Zeya Rivers. The Baikal-Lena grayling was described in 2005.

The scale cover is silver or yellow-brown with a purple tint. The gill covers are bright purple. On the lower jaw there is an oval black spot. Along the scale rows there are intermittent zigzag stripes consisting out of black dots. Between the pectoral abd the ventral fins there are parallel yellow-brown stripes visible. The pectoral and anal fins are gray-yellow. At the base of the ventral fins the scales are of reddish hue. The caudal peduncle, the adipose and the base of caudal fin are maroon-red. On the ventral fins, 3-4 oblique stripes of the same color are visible. On the dorsal fin, there are 3-5 (usually 3-4) rows of horizontally elongated maroon-red spots of different sizes. The top row of these spots does not merge with a narrow edge line of the same color.

Ilya Sherbovich