Also known as golden crucian carp. It is the ancestor of goldfish. It looks like crucian carp, with a flat spindle shape, normal dorsal fin and single caudal fin. There are two kinds of grass species, one is short-tailed golden crucian carp, and the other is long-tailed dovetail.

2. Goldfish in the text

Generally, the body is short, each fin is long, and the dorsal fin and caudal fin are bifurcated into four; The eyeball is straight and not prominent. Precious varieties include Ding Hong, Pearl and Tiger Head.

Literary genres are divided into six categories: literary fish with smooth head; Sarcoma of the head is of high head type; Sarcoma on the top of the head is developed, covering the cheeks, and the eyes are tiger-headed; The developed nasal membrane forms a pair of fluffy balls, which are fluffy balls; The gill cover turns over and grows into a turning type; The translucent vesicles outside the eyeball are blisters.

3. koi fish. With the improvement of the quality of life, many families will raise some fish after decoration to increase the environmental atmosphere. Koi fish is usually chosen, and koi fish is chosen because it is easier to raise.

Extended data:

Feeding skills:

In fish ponds, fish ponds have different ways of raising fish all year round. In early spring, the fish pond should be covered with a film to keep the water temperature stable. As koi fish recovered from hibernation in early spring, her physique was weak, so she should gradually increase the feed from a small amount and use some digestible plant feed to recover her physique.

Because the high water temperature in summer is not conducive to the normal growth of fish, it is appropriate to cover fish ponds with sunshade nets. Otherwise, under the scorching sun, the water temperature in fish ponds will rise rapidly, leading to the proliferation of phytoplankton and green algae, and the water quality will be turbid, which will affect the survival of koi fish.

But in autumn, it is the most suitable season for fish growth, so you can throw more bait appropriately to increase the proportion of animal protein. In winter, the air temperature and water temperature are obviously reduced, so it is best to move the fish indoors to keep the water temperature within the range of 0℃~ 10℃. The emphasis is on keeping warm and feeding properly. During the wintering period, the work of changing water, adding water and removing pollution should be reduced as much as possible to reduce interference and activities.