2, moonlight fish. Small fish native to South America can survive in the environment of 10, although the suitable temperature is about 20 degrees. It is gorgeous in color and mild in temperament, and can be mixed with other tropical fish. It begins to breed when it is 5 months old, and it is best to raise the temperature to above 25 degrees during the incubation period. If it is kept with swordfish, they will have hybrid species, which may surprise you.
3, fork-tailed fighting fish. Also called China Betta, it is native to the south of China. It used to be a kind of small fish that can be seen everywhere in the field, but now it is rare. The fin of ventral fin is particularly long, the fin of male fish is extended more, the tail fin is forked, and the body color is gorgeous. Foreign fish friends like fighting fish in China very much, and they call it "paradise fish". The suitable temperature is about 20 degrees, but it still survives strongly in an environment close to zero, and it is worthy of being a fighting fish. This little creature is brave and ruthless, and is not suitable for mixed culture. However, it is extremely gentle during breeding. Usually, foam nesting and oral incubation are used to raise offspring, and the temperature during breeding is preferably above 25 degrees.
4, snakehead. Also known as Tangyu, which originated in the Pearl River Delta region, is a unique fish species in China. It is on the verge of extinction in the wild and is listed as a key protected animal. Its suitable temperature is about 20 degrees, but it still moves normally at about 5 degrees. Its body color is beautiful and there is a golden yellow or silver blue longitudinal stripe on its side, so it is called the golden fish. Its reproductive ability is a little poor, and it lays dozens of eggs at a time. It can plant aquatic plants in the fish tank for fish eggs to attach to, and remove the parent fish from the incubator in time after laying eggs, because it has the habit of swallowing fish eggs.
At present, the relevant institutions release a large number of fry in the wild every year, and strengthen the protection of the ecological environment, expecting to re-emerge the wild Tang fish population in nature.
5. koi fish. Carp originated in Central Asia came to China and bred koi fish. After goldfish, it became a new ornamental fish, and was introduced to Japan. In the snowy Honshu Island, red, white and koi fish were born. Since then, koi fish's value has greatly increased, and it has been regarded as a national fish by the Japanese. Its suitable water temperature is above 20 degrees, but it is still strong in an environment close to zero, but it is difficult to grow up. In a suitable environment, koi fish can live for more than 50 years, and some fine varieties can be close to 100 years old, so there is a folk saying that "a fish accompanies three generations".
6. Goldfish. Cultivated from the wild crucian carp, it is the earliest ornamental fish in China. After more than 2,000 years of artificial breeding, it is still strong in its heart, although it has lost the fierceness and wildness of its ancestors. Even if it is outdoors in winter, as long as it is not too thick ice, it can persist for a winter, and it breaks through the ice under the sunshine in spring, which perfectly explains what it means to be soft and strong, and to overcome the strong with the weak.