What Is a Crayfish? Characteristics of Freshwater Crayfish and Precautions for Eating Them

The crayfish, also known as the swamp crayfish, is a kind of freshwater crayfish whose appearance closely resembles a miniature lobster, with a pair of well-developed large claws on its head and thorax. It is mainly distributed in the mountain streams and rivers of Northeast China, prefers clear water and lower water temperatures, and often crouches under stones.

Compared with the common red swamp crayfish, the crayfish has much higher water quality requirements and generally survives only in clean waters with little pollution, so it is often used as an indicator organism for monitoring water quality. It mostly comes out at night to forage and hides in rock crevices or burrows during the day, feeding on aquatic insects, algae and organic debris, and it molts several times during its growth.

In the folk cuisine of Northeast China, the crayfish is quite popular; after shelling, the meat can be made into traditional dishes such as crayfish tofu, with a tender and delicious taste. However, it should be noted that crayfish may carry parasites, so they must be thoroughly cooked before eating, and never eaten raw or half-cooked, to avoid harming health.

Affected by factors such as changes in the water environment and fishing pressure, the number of wild crayfish in some areas has decreased significantly. Keeping streams clean and reducing pollution is very important for the reproduction and survival of this freshwater creature.