Yarrow vachelli (scientific name: Leuciscus waleckii) is a fish of Cyprinidae and Yarrow genus, with long body, flat side, slightly curved back edge and round abdomen. The mouth is in the end position, the mouth is oblique, and the upper and lower jaws are equal in length. The operculum membrane is connected to the isthmus slightly anterior and inferior to the posterior edge of the anterior operculum. Gill rake 8 ~12. 2 rows of hypopharyngeal teeth, 3.5-5.3, 2.5-5.3 or 2.4-5.3. Vertebra 4+41~ 46.

The back of the body is bluish gray, the ventral side is light, and the dorsal fin and caudal fin are light gray; The edge of caudal fin is gray-black; The pectoral fin, ventral fin and buttock fin are light in color. Small and medium-sized fish that like cold and cold and adapt to saline-alkaline waters. Omnivorous and adaptable. Generally, 3 ~ 4 years old are sexually mature and produce sticky eggs.

Habitat:

Yarrow vachelli is a pelagic fish in the northern plain of China, which often lives in slow and still waters. The adaptability to water pH is not as good as that of crucian carp, but stronger than that of common carp. Although not a cold-water fish, Yarrow vachelli prefers to live in the middle and upper layers of rivers and streams with slow water flow, gritty sediment and clear water quality, and can also live in brackish lakes, which is rare in completely still water.