The head fish, whose scientific name is Geji perch, usually has parasites on its head, so it is difficult to distinguish it from its appearance, and its head must be removed when eating it.

Perccottus glenii, an old fish living in fresh water system, belongs to percocellata, goby suborder, pond bream, and perch pond bream.

The old fish is short and thick, slightly spindle-shaped, with a cylindrical front and a flat back. The head is large and flat, the snout tip is flat and flat, there is a big bone protuberance in the middle of the snout, and the eye area is wide and slightly concave. Big mouth, upper position, oblique crack. The mandible protrudes slightly, and then extends below the eyeball. There are villous sharp tooth bands on the maxilla, mandible and vomer. The tongue is wide and long, and the leading edge is round and free.

I like to live in the still water of the small tributaries of rivers, especially in the water-covered bubbles. Activity is not strong, do not travel far; Resistant to hypoxia and can survive under extreme hypoxia conditions. Strong wintering ability, able to lurk in the underwater soil, in hibernation, almost stop activities; It can survive the winter safely in the shallow bubble marsh, so it is known as the "returning fish". They mainly feed on insect larvae, beetle larvae and shrimps, and larger individuals also eat young fish. Generally, 2-year-old fish with a body length of 6 cm begin to mature, and the spawning period is from early June to July. The suitable water temperature for spawning is 16-20℃. After spawning, the eggs adhere to aquatic plants and are arranged neatly. Male fish have the habit of protecting eggs from hatching, and young fish take the initiative to ask for food 2 days after hatching.

Distributed in Heilongjiang, Tumen River, Liaohe River and other water systems, generally produced in marshes.

Lateolabrax japonicus is a common fish with wide distribution and strong vitality. Because of its small size and living in swamps, it usually has parasites on its head. Before the 1970s, it was seldom eaten by local people, and it was gradually recognized with the lack of fishery resources in Northeast China, so it was necessary to remove its head when eating. Its meat is tender, its thorns are less delicious, it is nutritious and has high edible value.