It is a good choice to raise carp in the pool. This kind of fish is a benthic fish, and its feeding habits are miscellaneous. It can eat a lot of things, and it likes to use its mouth to arch mud to find food. It should be noted that the feeding situation of this fish is often related to the season. When the temperature is low, it will enter a semi-dormant state of stopping eating.

Silver carp is a filter-feeding fish and one of the four major fishes. Its body is flat on the side, the whole is spindle-shaped, its back is bluish gray, its temperament is impatient, and it is good at jumping. In addition, this kind of fish grows fast, is not easy to get sick, and has high yield. It is usually mixed with grass carp and carp.

Like silver carp, bighead carp belongs to the four big fishes, and it is also a filter-feeding fish, and their shapes are very similar. It has a wide distribution range and high edible value. Generally, it lives in freshwater lakes, rivers and reservoirs, and is suitable for growing in fertile waters at 25-30 ℃.

Grass carp is a herbivorous fish, which generally moves in the middle and lower layers of water body and likes places with abundant aquatic plants. This kind of fish doesn't only eat plants, but sometimes it also eats meat. However, if it is raised artificially, it is more cost-effective to feed it with grass. Besides, it doesn't eat all the grass.

Carassius auratus is a widely distributed freshwater fish in China, which is distributed in other water systems except Qinghai-Tibet Plateau. It is an omnivorous fish, which has strong adaptability and reproduction ability, good disease resistance and fast growth speed. It is not high in water temperature and easy to raise.