The first kind is goldfish. There are many kinds of goldfish now, some of which are artificially improved. In fact, they are more delicate and not so easy to raise. So I suggest that when choosing goldfish, try to choose some original varieties. Grass goldfish is a good choice. Although it is not so ornamental, it is in good health and not easy to die, which can be considered as our novice fish culture.
The second kind of small carp is different from koi fish. Small carp are not so big, which means their oxygen consumption is not so big. Besides, the color is beautiful. Personally, I think it is better than grass goldfish, and my physique is stronger. There are some ponds in the park, and there are many small carp in them, which shows that they are not afraid of cold. If you are a friend who just started to raise fish, it is also a good choice, but the small carp grows faster and eats more.
The third protozoan fish. Some friends may ask, why is it a native fish? Because in recent years, the development of native fish in the aquarium market is very fast. In particular, some fish native to China are actually very ornamental. Moreover, they are native to China, so their adaptability to water quality and requirements for water temperature are not so harsh. As long as you don't scare them too much, it's actually easy to raise them. Then the protozoa that can be given priority are China betta, goby, pomfret, etc.