The scientific name of the spring-born fish is the pond smelt, which belongs to the order Salmoniformes, the family Smeltidae, and the genus Smelt. Common name is "Cucumber Fish".

The pond male is a small fish, generally only 8-9 centimeters in size as an adult. It likes to live in waters with low water temperature and clear water quality. It is still very active in winter and will continue to do so. of eating.

In the early spring of each year, adult fish begin to lay eggs in large groups. After laying eggs, they will die. After the eggs hatch, they will feed on the eggs of other fish and zooplankton. They will It grows to more than 10 centimeters and then reproduces, and so on. It is also nicknamed the annual fish.

About cucumber fish:

The fish body is slender and slightly flattened on the sides, with a small and pointed head, and the head is longer than the body height. The mouth is large and forward, with villous teeth on the upper and lower jaws and tongue. The maxillary bone does not extend backward to the lower edge of the center of the eye, and the eyes are enlarged. The scales are large and the lateral line is not obvious.

The dorsal fin is higher, and its height is greater than the body height; the end of the adipose fin is free and finger-shaped; the pectoral fin is small; the caudal fin is very thin, its height is only equal to the diameter of the eye, and the caudal fin is deeply bifurcated. The back is grass green, slightly yellow; the sides of the body are silvery white; there are small dark spots on the edges of the scales; each fin is gray-black.

The pond male has two dorsal fins, one of which is called the adipose fin. Along both sides of the adipose fin, there is a fat gland on one side. This is a cavity full of balsam, which is the source of its aroma. , and the fresher the fish, the stronger the taste. Based on this characteristic, people can easily judge the freshness of the fish.