The method to distinguish whether crucian carp is wild or farmed is as follows:

1. Wild crucian carp is generally white in color. If viewed from the side in the water or facing bright light, it will appear light yellow. color. The cultured crucian carp is gray-black, and the pure cultured crucian carp is darker. Wild crucian carp is white in color and has a raised back. Wild crucian carp has a slender body and light yellow color.

2. Wild crucian carp is thin in body shape and has a relatively high back, so-called high back. The cultured crucian carp is fatter in shape, with a big and soft belly. Farmed crucian carp is black in color. The farmed crucian carp is black in color and has a flat back.

3. There is also a kind of crucian carp cultured in large ponds or reservoirs, which is between wild and cultured. Although the color is a bit white, the body shape is fat and the back is smooth. Semi-cultured crucian carp has a flat back and a fat belly.

Extended information:

Appearance characteristics

Crucia carp has flat and tall sides, a small body, a dark back, and a light whitish abdomen. However, this is also due to the location of the fish. Different body colors show differences, but most of them are black with metallic luster. There is no beard on the mouth and the fish scales are small.

The body color of crucian carp is mainly gray, such as gray-black back, silver-gray belly and gray-white fins.

Crucian carp is widely distributed throughout the country (except the western plateau) and inhabits lakes, rivers, canals, and swamps, especially shallow lakes and ponds with lush aquatic plants. It has a strong reproductive ability and is a kind of fish. Very adaptable fish. It is also an excellent farmed fish and economic fish in my country. Production occurs all year round in waters across the country.

Baidu Encyclopedia - Crucian Carp (Bony Fish)