What do crucian carp seedlings eat?

Many farmers will breed crucian carp, which is a kind of fish that often appears on the table. The economic benefit of this fish is not bad. As a kind of crucian carp, many farmers want to breed it. There is a kind of crucian carp with high survival rate, which is allogynogenetic crucian carp. So the following small series will talk about what allogynogenetic silver crucian carp eats and how to breed it.

What do allogynogenetic crucian carp seedlings eat?

1. Allogynogenetic crucian carp mainly feed on plankton in water, among which zooplankton is the main food.

2. The larvae mainly feed on diatoms, rotifers, cladocera, copepods, chironomid larvae, organic debris and various artificial feeds.

3. In the adult stage, they mainly eat artificial feed, such as bean cake, peanut cake, vegetable cake, barley, wheat, corn flour, bran and granular feed, as well as organic debris, and also eat various algae (such as diatoms), rotifers, cladocera, copepods, chironomid larvae, fly maggots, eel feces and so on.

How to cultivate allogynogenetic crucian carp seedlings.

1, pond conditions

The pond covers an area of about 5 mu, and the length-width ratio is 3∶ 1. The east-west direction is convenient for water injection and drainage, and the sunshine is sufficient. After exposure, the bottom of the pool is cleaned and leveled, slightly inclined to the drainage direction, with a gradient difference of 0.3 meters to ensure that the pool water can be discharged by itself; When the dam is heightened, the knotless slope protection can be adopted; The slope of the dike is1∶ 2; The depth of the pond is 2.0 meters, and the water depth can be kept above 1.5 meters during culture.

2, pond cleaning and fertilization

Before the conditional pond is cleaned, the gap from the pond to the bottom of the pond should be fully sunned, and the whole pond should be sprayed with 10 kg/mu bleaching powder immediately, or with 100 ~ 200 kg/mu quicklime (the pond depth should be kept at about 0.3 m). After the fry enter tang qian for 5-7 days, the depth of water injection is 0.5m, and the water must be filtered with an 80-mesh net to prevent harmful organisms such as wild fish from entering the pond. Immediately after water injection, 200 ~ 300 kg/mu of base fertilizer was applied to the pond to cultivate palatable bait organisms for fry cultivation.

3. Eliminate fleas and transfer water sources

Check the water body 7 days before seeding. If copepods, cladocera and aquatic insects are found in the water, trichlorfon should be used to remove them, and the dosage is 0.5 ~ 0.7 g/m3. After eliminating fleas, feed water and fertilize it until the water reaches about 0.5 meters. Use biological fertilizer for fishing, Bacillus and amino acid fertilizer paste to fertilize water, and cultivate natural bait for fry opening. Usage and dosage depend on the product manual. During fertilization, start the aerator 1 ~ 2 hours every day at noon, and gradually raise the water level after fertilization. Before the 65,438+0 fry go down to the pond, the antidote is sprinkled to change the water, and the toxic factors (microcystins, drug residues, etc.) are removed by chelation and detoxification. ) in the pond; Spraying anti-stress drugs in the whole pond 1 hour before entering the pond and starting the aerator can greatly reduce the stress reaction of fry when entering the pond, which is very helpful to improve the survival rate of fry.

4. Temporarily raise strong seedlings

Before the fry go down to the pond, they should be poured into the temporary fry rearing box, fed with special splash or egg yolk water, and then put into the fish pond after the fry are full. The method of egg yolk water is to boil the eggs in water for half an hour, the older the better, then take out the egg yolk, wrap it in two layers of gauze and rinse it in the fry box. 1 egg yolk can feed 65438+ ten thousand fry. Practice has proved that the survival rate of splash culture is higher when you go to the pond after eating, especially when the water quality at the mouth of the fish pond is not good.

5, fried stockings

The stocking density of allogynogenetic crucian carp fry is1.5000 ~ 0.2000/mu, and it can be stocked to 250000 ~ 0.3000/mu if the pond mouth conditions are good and the feeding technology is good. When the fry go into the pond, the temperature difference of water generally does not exceed 2℃. If the temperature difference is large, it is necessary to stir the upper and lower water layers to reduce the temperature difference and slowly put in the fry; Or put the oxygen bag with seedlings into the pool water to balance the water temperature, and then put the fry. When raising seedlings, you should choose sunny days, and it is not suitable to raise seedlings before sultry, rainy or thunderstorm weather. Seedlings are usually released at 9- 10 in the morning. In the afternoon, when the water temperature is high, it is easy to form a temperature difference, and it is more dangerous for fry to enter the pool. The general position is to enter the pool with the wind and let the fry swim with the wind; If the seedlings are released with the wind, the swimming power of the fry is poor, which is not enough to overcome the wind and waves, resulting in dense seedlings, death or loss.

6. Feeding management

Generally, the breeding method of allogynogenetic crucian carp fry is soybean milk feeding.

(1) Feed soybean milk on the second day after the fry enter the pond, and splash it 4-5 times/day, and the dosage is 2kg/day for every 65438+ 10,000 fry, and gradually increase. The key point is to grind the pulp carefully and splash the pulp evenly, because the fry just got into the pool and their feeding ability is not strong.

(2) After 1 week, the soybean feed was increased to 4 kg/day per110,000 fry. After 10 days, when the fry all grow to 15 mm, soybean milk can't be effectively fed, and powder feed is needed. You can also start splashing water on the fifth day after splashing water in the pond and feed it with powder spray, so that the phospholipid content in the feed reaches 5% ~ 7%. The formula is beneficial to cell proliferation and can promote the rapid growth of fry. Feed the splash powder for 3-5 days, then mix the powder with water to make cakes and feed them along the pond. In another 5-7 days, the scraps will be fed. The daily feeding amount depends on the growth condition, specifications, sediment, water quality and weather of the fish. At the initial stage of culture, the daily feeding amount is 5% ~ 10% of the fish weight. Feed it four times a day at 8:00, 1 1:00, 14:00 and 17:00 respectively. Adhere to the principle of "four fixes" in feeding.

7. Sell in a separate pond

/kloc-after 0/5 ~ 20 days, when the fry grow to a total length of 2.5 ~ 3 cm, it is necessary to pull the net in time to exercise and prepare for the pool or sale.

Allogynogenetic crucian carp is the offspring of artificial mating with Fangzheng crucian carp as mother and Xingguo red carp as father. It grows 2 ~ 3 times faster than common crucian carp, has strong adaptability to life, few diseases and high survival rate, and is a very good artificial breeding variety.