As shown in the picture, it may be a swamp male? ?Not necessarily correct

Smelt family?Osmeridae?Male genus?Hypomesus fish

The picture below is The pond male Hypomesus olidus, commonly known as the cucumber fish

The body is slender and slightly flattened laterally. The dorsal fin and pelvic fin are opposite to each other and located at the midpoint of the body. There is an adipose fin between the dorsal fin and caudal fin. Caudal fin deeply forked. The tip of the snout and the lower jaw are slightly longer than the lower jaw. The body is covered with thin and oval-shaped scales. The back of the adult fish is light brown or olive green, with a metallic silver strip on the midline of the body, a silvery belly, colorless fins, and gray-black spots on the edges of the scales on the back.

Originally distributed on both sides of the North Pacific and along the Arctic Ocean. In Asia it is found in Japan, China, North Korea and the Far East of the former Soviet Union. In our country, it is only limited to the middle and lower reaches of Heilongjiang in the northeast, and is naturally distributed in the lower reaches of the Ussuri River and Tumen River. The transplantation, development and utilization of male fish resources began in 1984, and has now been transplanted to most provinces and cities in northern my country and the south. In some areas, more than 100 reservoirs and lakes are settled.