There are many reports on indoor culture of crayfish on mobile phones and the Internet, which have the advantages of high density, high income and quick effect. As soon as the price is more than 10,000 yuan, let's talk about the biological problem of crayfish. 1. Crayfish has the habit of digging holes. How can I make holes here? 2. Crayfish has the habit of foraging around. How does it get around? How to plant crayfish aquatic plants, crayfish feeding and so on.
Summary: We must have a rational analysis of this indoor culture. Personally, I think indoor culture is not suitable for crayfish species.
What are the conditions for raising crayfish?
In order to meet the ecological conditions of crayfish culture, the culture channel should meet the following conditions:
1, water quality conditions
Crayfish breeding rivers should avoid the sewage outlets of industrial and mining enterprises, especially the pollution sources that are toxic to crayfish.
2. Environmental conditions
Dams on both sides of the river should be firm and not affected by disasters such as floods and droughts, so as to meet the requirements of drainage by waterlogging and water conservation by drought. There should not be too many inlets and outlets in the river, and it is necessary to ensure that no shrimp can escape from each inlet and outlet. In addition, the bottom of the river should be flat to facilitate management and fishing.
3. Water level drop
The annual water level difference is small, preferably not more than 1 m, and the water depth is1~1.5 m.
4. Water flow
Large water velocity, high water exchange rate and high dissolved oxygen in water are beneficial to crayfish culture, and the water velocity should be within 1 m/s.
5. Biological bait
There should be abundant aquatic organisms in the river, and they can be used conveniently, which can solve some bait problems.
6. Contradiction of water use
It is necessary to understand the situation of irrigation, water storage and flood discharge in the surrounding farmland, and solve the contradiction between water use for shrimp culture and water conservancy.
The measures for cultivating crayfish by blocking the river have the following four aspects:
1, set the block
Blocking nets are usually set on the wide water surface of the river, and it is required to be far away from the channel, with quiet environment, flat bottom, abundant aquatic plants, fresh water quality and no pollution, and the annual water depth is kept at 0.8 ~1.5 meters. The mesh is polyethylene mesh, the height of the mesh should be 60 ~ 80cm higher than the highest water level all the year round, the mesh size is 0.8cm, and the shape of the block depends on the shape of the water surface, with an area of 5 ~10m2. It is very effective to sew a hard plastic film on the upper end of the mesh as an escape prevention facility.
2. Put in shrimp seeds
After the block is built, the wild fish in the net should be removed first. To be on the safe side, the wild fish in the net should be thoroughly removed by electric traps, and each mu should be splashed with 13 kg of bleached water. After that, you can put in the brooding parent shrimp, with an amount of 25 kg per mu, and at the same time put in some silver carp and bighead carp.
3. Scientific feeding
A bait feeding ground shall be set up at the shore shoal in the blocking area, and the feeding amount shall be determined according to the season, weather, crayfish growth and feeding intensity, etc., and the feeding amount shall be twice a day, so that the crayfish can finish eating within 2 hours each time.
4. Daily management
Adhere to the inspection every day, mainly to check whether the mesh is damaged, whether the escape prevention facilities are in good performance, and correct them in time when problems are found. Patrol day and night during flood season to prevent the water level from being too high. Remove the residual bait in time, and wash/kloc-0 mesh every 5 days or so to ensure the normal exchange of water.
Is crayfish easy to raise?
Freshwater crayfish (scientific name Procambarus clarkii, commonly known as crayfish) is one of the main shrimp species cultivated in China at present. In recent years, there has been an unprecedented crayfish breeding fever in the country from south to north, and the breeding area has increased geometrically. Many breeders lack in-depth understanding of the biological habits of crayfish, and believe that as long as crayfish are cultivated in places with water, they can get rich and run a well-off life. In fact, crayfish culture has high requirements on water quality, environment, feed, management and disease prevention, and shrimp culture fails frequently.
First, understand the special habits of crayfish
1, low reproductive capacity
Generally, the fecundity of each sexually mature female shrimp is about 300, and the maximum is no more than 1000. It is difficult for crayfish to conceive eggs in vivo, hold eggs and hatch in vitro, and breed artificial shrimps on a large scale.
2. Xiyin
Crayfish like to live in shallow wetlands, and can be cultivated on the surface of waste ponds, rice fields and aquatic plants (lotus root, water cress, water bamboo, etc.). There are tall trees around the breeding base, which is not harmful to shrimp culture. Sunshade nets and other facilities need to be set up in summer and autumn with high temperature.
3. Domain attack
Crayfish has a strong territorial behavior. A certain group chooses a certain area as a fixed territory, and other similar species are not allowed to enter. When the outer shrimps meet, the precursors of the two shrimps rise, and the two claws stretch forward to fight until one side retreats or fails, otherwise it will be killed or even eaten.
4. kill each other
Crawfish cannibalize each other when the colony is too large or the bait is insufficient. There will be cases of "hard eating and soft eating" (crayfish are most likely to be eaten by leftovers within a few hours after molting), "strong eating and weak eating" (strong individuals eat weak individuals) and "big eating and small eating" (large individuals eat small individuals).
5. Dig a cave to live in
Crayfish have a strong ability to dig holes. The depth of the holes is between 50 and 80 cm for adults and 25 cm for young shrimps. Most crayfish burrow in hot summer and cold winter to avoid extreme temperatures. During the breeding period, the mating and spawning of crayfish are carried out in caves. Therefore, the culture of crayfish is destructive to the pond, and it is better to use clay or loam in the culture pond.
6. Escape
Crayfish are most likely to escape in the environment, lack of bait and continuous rainy weather. Therefore, anti-escape facilities must be set at the outlet of Zhou Hejin, the fourth shrimp pond.
7, life is not long
It is generally believed that the life span of crayfish is about 18 months, and crayfish that meet the market specifications or spawn and breed must be caught and marketed, and it is an important measure to increase the yield and benefit of aquaculture by rotation.
Catch crayfish in the ground cage
8. molting
The growth of crayfish needs molting. Adult shrimps with sexual maturity generally shed their shells more than 1 1 time (2 for larvae and 9 for young shrimps), and the whole molting process takes 5 ~10 minutes.
9, clings to
Crayfish have strong climbing ability, and generally climb in the water grass when molting to avoid enemies and similar creatures; When the water quality is poor or the dissolved oxygen is insufficient, it will climb to the grass head or the bank of the pond ditch. Planting aquatic plants in aquaculture ponds can provide crayfish with habitat, climbing, shade and concealment.