Experience of culturing grass carp in cage

Grass carp mainly eat grass. It often lives in the rich places of water and plants and belongs to middle and lower fish. The optimum growth temperature is 20-30 ℃, and the food consumption is large. Above 32 ℃ or below 15 ℃, the growth rate slowed down obviously, and the food intake decreased. The water temperature was below 10 ℃ and stopped eating, and half of them died in the state of winter eyes. It likes to live in places rich in dissolved oxygen and fresh water, but doesn't like fat and water. When the dissolved oxygen in the water is less than 2 mg / L, although the water temperature is good, the appetite also decreases; when the dissolved oxygen is less than 1 mg / L, do not eat, start anoxic floating head; 0.9 mg / L die. Therefore, grass carp cages should have smooth running water, thin and pure water quality, and floating cages should be used to make fully enclosed cages 50cm above the surface of the water. The cage should be small.

Stocking density of fry and fry: the stocking density of fry is 300 million 500 fish per square meter of water surface, and the stocking density of fish fry is 30 million 500 fish per square meter of water surface (the individual is 100 million 500 grams, especially the disease of 500 grams is less, the growth rate is the most considerable). Can be directly cultivated into adult fish.

Feeding and management: cage grass carp generally start from summer flowers, with a body length of more than 3 centimeters. At this time, the fish fry have been raised for more than 20 days after coming out of the film, and the food is plankton. In the absence of enough plankton, they should be fed with crushed high-quality and high-protein bait and water earthworms, duckweed and duckweed. When feeding, first domesticate, that is, first sprinkle a little powder in the box to lure the fish up, each time, to form the potential of competition, there are always a small number of fish can not eat. Fierce food grab, let it taste the delicacy of bait, a few days later form a habit, gradually feed more. Feed Wuping and Little duckweed to the full, eat and throw again, and do not feed night food. Grass carp grow to more than 6 cm, can eat tender water grass; grow to more than 10 cm, can be draught, land tender grass, vegetable leaves, etc., prefer to eat insects and bran. The Beginning of Autumn has to feed enough before. After the Beginning of Autumn, the weather changes greatly, so it is limited to 5-6 hours to finish eating, otherwise you will get sick. If you can't finish it, take it out of the box. The Beginning of Autumn used to have enough to feed, but he was gaining weight from June to July. The water temperature is high from August to September, and the fish are too full to eat.