in winter? There are many kinds of ornamental fish, some of which are tropical fish. If the temperature is below 20 C in winter and there is no heat preservation measures, it is very easy to freeze to death. But some eurythermic fish are not easy to freeze to death, their adaptability is stronger, as long as the water surface is not frozen, generally will not freeze to death. Of course, no matter what kind of fish, they prefer higher water temperature, which will be more energetic and appetizing.
1, goldfish: goldfish is one of the most common ornamental fish, it evolved from crucian carp, in our country has a very long history of cultivation. It has many varieties, but generally divided into four categories, of which grass gold is the best to raise, the ability to adapt to the environment is strong, but also relatively cold-resistant, winter is not easy to freeze to death.
2. Koi: Koi is a high-grade ornamental fish. It is mainly produced in Japan. The most common ones are Taisho Tricolor, Showa Tricolor, Red and White, etc. As an eurythermic fish, Koi carp is also relatively resistant to low temperature and can survive at 2 C, but its demand for oxygen is relatively high.
3. Tangyu: Tangyu, also known as golden fish or white cloud golden fish, is a unique species in China and belongs to the second-class protected animals. It is worth mentioning that it has been extinct in the wild, currently only artificial breeding, its reproductive capacity is not strong, but relatively cold-resistant, can tolerate the low temperature environment of 5 degrees Celsius.
