How can we make snails and snails breed faster?

Snails and snails are hermaphroditic, and females are generally older than males. Male reproductive organs are composed of testis, vas deferens and penis. The testis is located on the left side of the outer sheath cavity, the copulator tube is wrapped in the right tentacle, and the opening of the reproductive hole is located at the top of the right tentacle. Female reproductive organs are composed of ovaries, fallopian tubes and uterus. Snails are viviparous, and both embryonic development and young snail gestation are carried out in the body, so the uterus is particularly large. During the breeding season, the uterus contains many young snails at different stages of development. Generally speaking, it is difficult to tell the sex of a snail, only when it crawls and sticks out its tentacles. Usually, the right antenna is bent inward from the male snail, and the bent part is the male genitalia. May ~ 10 is the snail breeding season every year, especially in June and July. The optimum water temperature for culture is 20 ~ 26℃. River snails are animals that give birth in stages. Usually each female snail lays 2-6 eggs at a time. 1 ~ 2-year-old female snails give birth to about 30 babies a year; 3-4-year-old female snails produce 30-40 young snails a year. The newborn snail shell is soft and white, which is easy to be eaten by other animals. At this time, we should pay attention to protecting snails. With the growth of the shell, the shell gradually hardens and the color becomes darker.

The culture cycle of river snail is 12 months. Generally, young snails born in July and August will reach sexual maturity in May of the following year, and can be mated and calved in August. Parent snails used for reproduction can not only catch natural snail species, but also introduce them to farmers. Because snails are sensitive to dissolved oxygen in water, if the dissolved oxygen in water is lower than 3.5mg/L, they can't eat much, and if it is lower than 1.5mg/L, they will be in danger of death. Therefore, it is best to build a micro-flow pond in the parent snail pond to keep rich dissolved oxygen. Before stocking the parent snails, the chicken manure and broken rice straw were evenly mixed and piled at the bottom of the pond according to the ratio of 3∶ 1 to cultivate natural bait. 1 ~ 2 weeks later, the mother snail can be put into compost when it is decomposed. Because snails often mate and lay eggs in shallow water, the water level of the parent snail pond should not be too deep, and it is appropriate to keep the water level of 15 ~ 20 cm. In the micro-flow aquaculture pond, the stocking density of parent snails is 0.5 ~ 1.0 kg/m3.

Snails don't need any artificial help to mate and lay eggs. The larvae can start feeding cooked egg yolk and fine powder 2 weeks after birth. Ensure that the larvae have enough bait and fatten quickly. After intensive cultivation of about 1 month, when the weight reaches about 0.6g, it can be moved into a snail pond for culture.

Third, the cultivation of commercial snails

Selection and arrangement of farms

The pond for raising snails requires flat terrain, sufficient water, no pollution, convenient transportation and rich humus in the soil layer. Snails are very sensitive to dissolved oxygen in water, with abundant oxygen and fresh texture, and the effect is better with micro-running water. The water level in the snail pond is generally kept at 30 ~ 40 cm, which is slightly deepened in winter to keep the water temperature constant and slightly lowered in early spring and early autumn to raise the water temperature. In summer, you can build a melon shed on the snail pond, or plant Eichhornia crassipes on the surface of 1/3 to keep out the sun and prevent the water temperature from being too high. Taking the above measures can maintain the appetite of snails and accelerate their growth.

Before stocking young snails, the snail pond should be thoroughly disinfected with drugs. The disinfection method is the same as the general pond method. Secondly, apply sufficient base fertilizer to cultivate natural bait. It is best to use decomposed livestock manure as base fertilizer because it contains more humus.

(2) release the young snails

Snail larvae should be stocked in sunny mornings. Release in batches and stages, and the release time is from late May to early October of 10. Usually 667m2 can release 40,000-50,000 larvae.

(3) Feeding of feed

Snail feed comes from natural feed and artificial feed.

1. Natural feed: use fertilizer to cultivate zooplankton and its bottom organic matter in water.

2. Artificial feed: livestock manure and internal organs, small fish and shrimp, vegetables, rice bran, etc. are artificially raised. Animal feed and plant feed are best mixed by grinding. Because snails eat feed with their tongues, it is more appropriate to soak them in clear water before feeding them.

Artificial feed is fed/kloc-0 every 3 ~ 4 days, mainly in the morning. The feeding amount depends on the situation, which is generally 10% ~ 30% of the snail's weight. There is no bait in winter. Pay attention to the feeding situation and water quality changes of snails when feeding, so that the growth of snails will not be affected by insufficient bait, and the water quality will not deteriorate and the cost will increase because of excessive bait.

(4) Daily management

Snail breeding needs fresh water, rich dissolved oxygen, suitable pH value and rich natural bait. Too thick or too light water is not good for the growth of snails. Therefore, we should pay attention to the change of water quality, change the water regularly, and keep the water fat, lively, tender and cool. At the same time, do a good job in preventing escape.

We should do a good job in preventing the enemy from hurting. Snails have many enemies, mainly waterbirds, voles, tadpoles and herrings. It is necessary to strengthen inspections, find enemy harm, and remove it in time.

(5) Snail fishing

When the snail reaches more than 10g, it can be caught and marketed. Fishing methods include: unarmed capture, food trap, hand-copied net capture and dry water capture. Pay attention to the operation when catching snails to prevent the snails that do not meet the market specifications from being injured. Dry water capture is only suitable for cleaning the pond after completing a breeding cycle.

Fourth, the prospect of snail farming

The benefit of snail culture is remarkable. 4 yuan/kg is the current market price, and the output value of 667m2 can reach 1 400kg according to 3.5 yuan/kg. In addition, a small amount of grass carp can be mixed in the snail pond to increase the unit area benefit of the snail pond. Because breeding snails does not need to feed a lot of bait, the bait cost is also very low. Therefore, the net profit of snail farming is about 1 1,000 yuan /667m2, with considerable benefits.

Snacks with snails as the main raw material are favored by consumers for their delicious, refreshing and unique flavor, especially in central Guangxi. Stir-fried snail, boiled snail and snail powder have become household names, and they are also one of the famous local snacks in Guangxi. Therefore, the consumption of snails is quite large and the market prospect is promising. Snail farming is a low-risk and high-benefit aquaculture project.