1, growth habits are different: crucian carp like to live in the grassy, slow-moving environment, while the grass carp has a strong adaptability, can survive in a variety of water environment.

2, different food: crucian carp mainly to plankton, aquatic plants, algae, etc. for food, and occasionally eat some small fish and shrimp, while the grass carp is more omnivorous, in addition to algae, will eat some small fish, shrimp, snails and so on.

3, crucian carp (scientific name: Carassiusauratus) is a carp, crucian carp fish, body length 46.9-255 mm, long oval, laterally compressed, dorsal fins at the beginning of the body's highest point, the ventral margin is narrow and no skin prongs, the eye side of the median, the posterior edge of the kiss from the end of the proximal, the eye interval is wide and convex, the anterior and posterior nasal aperture adjacent to the eye is located slightly in front of the mouth in the anterior position, oblique, the mandible than the maxillary slightly shorter.