2. Different foods: Carassius auratus mainly feeds on mollusks and aquatic insects, while Carassius auratus mainly feeds on leaves and buds of aquatic plants.
3. Different living habits: sea crucian carp do not migrate. No matter how the temperature changes, the crucian carp only lives by the sea. As the temperature rises, the crucian carp will swim to the lower layer of the water or other cool places.