If you raise fish in a small pool, you should change its water regularly, and you should not feed too much at ordinary times. In addition, you should ensure that the temperature changes little. First of all, changing water is necessary for fish farming, and small pools are no exception. Compared with ordinary fish tanks, small pools contain more water, so changing water does not need to be too frequent. Secondly, feeding, because it is a pool to raise fish, it is not convenient to clean it up, so we must control our food intake. As for the temperature, as long as it doesn't freeze, it will be fine.

1. Goldfish: It is perfect to raise goldfish in a small pool. There are many kinds of goldfish with different colors, which look very beautiful. Moreover, as a wide-temperature fish, the temperature requirement is relatively low, so it can be fed in fish ponds, unlike some tropical fish, which must live in an environment above 20 ℃.

2, sole catfish: sole catfish can be used as both food fish and ornamental fish, and its feeding habits are miscellaneous, and it likes to live in slow-flowing waters. Its life span is not long, and its range of activities is very small. It needs to rely on freshwater mussels to breed, so it is difficult for individuals to breed.

3, medaka: There are many kinds of medaka, and it is generally suitable for breeding in fish ponds, which is a hybrid breed of wild medaka. As a small ornamental fish, compared with common tropical fish, it has a great adaptability to temperature and can live without oxygen.