1, mainly depends on its size. Generally, the male fish is smaller than the female fish, and the female fish's belly is bulging, while the male fish's abdomen is relatively flat.

2. Fin and color. The fin of male fish is larger than that of female fish, and the spawning hole of male fish is smaller than that of female fish. At the same time, the color of male fish's body is more vivid than that of female fish, especially during the breeding period. The abdomen of the male fish is obviously not as soft as that of the female fish, and the male fish swims faster than the female fish, and can obviously feel more active than the female fish in his hand.

Representative species of lion head goldfish include red lion head, blue lion head, vermilion head with purple robe, black and white lion head, red lion head with five flowers, purple lion head with red velvet ball, red and black lion head, jade seal lion head and so on.

The specific conditions for selecting fish are as follows:

Short and strong body; Sarcoma is thick and protruding like strawberry; The tail is thick; The head and back should be wide; The abdomen is equally protruding left and right; The gluteal fin is hidden under the caudal fin in pairs and is not exposed; Both eyes and mouth are trapped in sarcoma. In line with the above conditions, it can be called a senior goldfish. The treasures in the varieties are expensive, and most of them are red in color. In recent years, many new colors have been added, such as red, black, blue, red, white and five flowers.

Feeding method of lion head goldfish;

1, feeding

Feeding are nutritious animal feed and white sesame seeds. Animal feed such as Daphnia, earthworm, Tenebrio molitor, caterpillar, dermatophagoides, etc. Earthworms and sesame seeds are mainly fed. Both red and black earthworms can be fed. Don't feed the inferior goldfish feed. Because this kind of feed has too much starch, poor nutrition, difficult digestion and easy pollution of water quality. Fish are malnourished and easy to get sick.

2. Lighting

Put the fish tank in the sunlight 1-2 hours. In this way, ultraviolet rays of sunlight are used for sterilization. Try to prevent fish diseases, supplemented by medication. At the same time, due to photosynthesis, the color of fish body is more bright and beautiful.

3. Change water

Changing water frequently can increase dissolved oxygen in water. When changing water, you can only change one-third to one-fourth of it, and you can't change a lot at once, so the fish can't adapt. It is very important to keep the water quality in the aquarium clear. There is enough dissolved oxygen in the water for fish to grow and grow fast. Otherwise, it will stop growing or even die.

4. Stocking density

Because of its small size, domestic rectangular aquariums should not be raised more, but less should not be raised more. For example, in a container with a length of 40 cm, a width of 25 cm and a height of 30 cm, 6-8 small fish with a length of 5-7 cm can be raised.

Refer to Baidu Encyclopedia-Lion Head Goldfish for the above contents.