1, appearance difference: the body of grass carp is usually long, cylindrical and the abdomen is flat; Carp's body is shorter and wider, and its head is bigger. The body color of carp is generally golden yellow or silvery white, and sometimes red species can be seen, while the body color of grass carp is mainly gray-black.

2, beard and oral structure: carp usually has a beard next to the mouth, grass carp usually has no beard; Carp likes to eat pond mud with a kiss arch, while grass carp's kiss is shorter and smaller; Carp's mouth is relatively small, its jaw is not prominent and its teeth are small, while grass carp's mouth is large, its jaw is prominent and its teeth are obvious.

3. Body shape and habitat: Grass carp is cylindrical, slightly round, with a flat abdomen, mainly inhabiting aquatic plants, such as ponds, rivers and lakes. Carp is spindle-shaped and has a round abdomen. It mainly lives in the bottom of the water and likes to live in sediments.

4. Scales and colors: the scales of grass carp are large and round, smooth and delicate, and light golden yellow; Carp scales are relatively large with obvious vertical and horizontal stripes, and the color is generally golden yellow or silvery white.

5. Edibility and economic value: Grass carp is an omnivorous fish, which mainly feeds on aquatic plants, insects, small fish and shrimp, and its meat is tender and tender, which is suitable for many cooking methods; Carp is also an omnivorous fish, preferring animal feed, and its meat quality is relatively thick, which is suitable for making soup.

6. Biological taxonomy: Carp belongs to CYPRINIDAE, CYPRINIDAE and CYPRINIDAE in biological taxonomy; Grass carp belongs to CYPRINIDAE, CYPRINIDAE and Ctenopharyngodon. These differences make grass carp and carp different in appearance, behavior and ecological adaptability.