CATDOLL : CATDOLL: How do snails reproduce?

How do snails reproduce?

1. Selection of parent snails for breeding of field snails

In the breeding of field snails, the selection and transportation of parent snails should be over 4 months old, weighing more than 30 grams, and with intact shells, to ensure the egg-laying rate and hatching rate. When selecting, attention should also be paid to the ratio of male and female snails, and a ratio of 4:1 is more appropriate.

Field snails are dioecious, and fertilization occurs internally. The main differences in appearance between male and female snails are: female snails are larger and male snails are smaller in the same age; female snails are short and thick, while male snails are slender; the female snails have a thin shell opening, sharp outer lips, and flat periphery of the carapace. The male snails have a thickened shell opening, with outer lips that tilt outward, a raised middle portion of the outer edge of the carapace, and upper and lower edges that sink into the soft body. When the snail body is 3 to 4 cm long and the shell is transparent, there is a light red dot on the right side of the middle of the first whorl of the male snail, which is the testis, while the female snails do not have it.

Because the snail shell is thin, it is easy to be crushed and kill.

． If transportation is required, be careful. Generally, use baskets for transportation. Use water grass as a cushion when placing snails, that is, one layer of snails and one layer of water grass. Layers are stacked one after another to protect the snails from damage. If it is transported over long distances, water should be sprinkled every 1 to 2 hours to keep the snails moist.

(II) Selection and cleaning of spawning grounds for snail breeding

In the breeding of field snails, the size of the spawning ground is determined according to the scale of production. Generally, there is no unified requirement, but the spawning ground is generally selected in a place with sufficient water source, good water quality, convenient water inlet and outlet, and quiet environment. The construction of the spawning ground can be carried out according to local conditions. Generally, the spawning pond can be selected from land, cement pool, ditch, etc.

It is also possible to cultivate snails by building a comprehensive spawning pool, hatching pool and nursery pool, that is, using a large pool with a small ditch, and each special pool is replaced by a ditch. The ditches are connected to form a curved channel to facilitate the circulation of water. The inlet and outlet holes are respectively set at both ends. For the convenience of management and operation, the spawning pool area should not be too large, and the length is generally unlimited. The width is more suitable for 1 to 1.5 meters, and the water depth can be maintained at 30 to 50 centimeters. If water is used

For mud ponds, the bottom of the pond should be covered with 3 cm thick silt, and newly built cement ponds should be soaked for 10 days before they can be used.

Before releasing the parent snails, the pond should be cleaned and filled with new water. Then bamboo pieces should be inserted around the pond and in the middle of the pond. The wood pieces should be 30 to 50 cm above the water surface. Some aquatic plants should be planted in case the female snails lay eggs. There should also be escape prevention facilities around the earthen pond.

(III) Stocking and cultivation of parent snails for breeding of field snails

During the breeding of field snails, the stocking density of parent snails should not be too large. 30 to 35 per square meter is appropriate, and less is appropriate: After the parent snails are released, intensive cultivation begins, feeding sufficient green fodder every day, such as vegetables, duckweed, terrestrial grass, etc., and appropriate concentrated feed, such as bean cake, wheat bran, rice bran, etc.

The feeding amount should be determined and adjusted according to the weather and feeding conditions. Do not feed too much concentrated feed to avoid affecting the water quality. Generally, the daily feeding amount is 0.5% to 0.7% of the total body weight of the snail. The daily feeding amount of green feed should be based on meeting its feeding needs. The green feed that has been eaten should be fished out every day. During the cultivation period, water quality management should be strengthened to keep the water clean. Generally, add water every 2 to 3 days.

Add new water once, or it is better to have clean water flowing in slowly, which is beneficial for the snails to lay more eggs and lay eggs earlier.

The parent snails can also be cultured after the young snails have been reared for 45 days and can be distinguished between male and female. The culture method is the same as above. After 3 to 4 months of rearing, they reach sexual maturity and can mate and reproduce on their own.

(IV) Collection and hatching of eggs for snail breeding

In the process of snail breeding, the collection and hatching of egg masses are intensively cultivated for 7 to 10 days, and then the parent snails begin to mate and lay eggs. The mating of new snails takes place during the day. After mating, the female snails climb on the stems and leaves of plants, the pool walls and floating objects in the pool at night, and leave the water surface to lay eggs. Each time, 500 to 2,000 eggs are laid, and the egg laying time lasts for 20 to 90 minutes. After laying eggs, they automatically fall into the water.

Field snails reproduce by mating and laying eggs. The mature eggs of field snails meet sperm and are fertilized at the top of the oviduct. The fertilized eggs undergo embryonic development in the uterus of the mother snail. After development is complete, they can give birth to offspring in batches. Reproduction usually begins in March and April each year.

The snail is an ovoviviparous animal with a unique reproductive method. The mature eggs meet the sperm at the top of the oviduct and are fertilized. The fertilized eggs undergo embryonic development in the uterus of the mother snail. Both the embryo and the young snail are completed in the mother's body, and this process takes about a year.

How do snails reproduce?

Question 1: How do snails reproduce? Snails are dioecious animals and need to mate to reproduce. In addition, snails are ovoviviparous animals with a unique reproductive method. The embryonic development and the development of the snails are completed in the mother's body. It takes about a year for the fertilized eggs to produce the snails. Snails lay eggs in batches and begin to reproduce from March to April every year. While producing the snails, the female and male parent snails mate and fertilize, and at the same time, the snails to be produced the next year are bred in the mother's body. A female snail produces about 100 to 150 snails a year.

Question 2: How do snails mate? Snails are dioecious, and female individuals are generally larger than males. The male reproductive organs are composed of testes, vas deferens, and testicles. The testes are located on the left side of the mantle cavity, the copulatory tube is wrapped in the right tentacle, and the genital opening is located at the top of the right tentacle. The female reproductive organs are composed of ovaries, fallopian tubes, and uterus. Snails are ovoviviparous, and embryonic development and gestation of young snails are all carried out in the body, so the uterus is particularly large. During the reproductive season, the uterus contains many young snails at different developmental stages. Generally, it is difficult to distinguish the sex of snails, and they can only be distinguished when they crawl and extend their tentacles. Usually, the snail with the right tentacle bent inward is the male snail, and the bent part is the male reproductive organ. The breeding season of snails is from May to October every year, especially in June and July. The optimal water temperature for breeding is 20-26℃. Snails are animals that give birth in batches. Usually, each female snail gives birth to 2-6 children each time. Female snails aged 1 to 2 years old produce about 30 offspring per year; female snails aged 3 to 4 years old produce 30 to 40 offspring per year. The shells of newly born snails are soft and white, and they are more likely to be eaten by other animals. At this time, you should pay attention to protecting the young snails. As the shell grows, it gradually hardens and the color becomes darker.

The breeding cycle of field snails is 12 months. Generally, young snails born in July and August reach sexual maturity in May of the following year, and can be used for reproduction and giving birth in August. In addition to catching natural snail species, parent snails for breeding can also be introduced from farmers. Since field snails are sensitive to dissolved oxygen in water, they will not eat much if the dissolved oxygen in the water is lower than 3.5mg/L, and there is a risk of death when it drops to 1.5mg/L. Therefore, the parent snail pond should maintain rich dissolved oxygen and it is better to build a micro-flow water pond. Before stocking parent snails, mix chicken manure and broken straw in a ratio of 3:1 and pile them at the bottom of the pond to cultivate natural bait. After 1 to 2 weeks, the compost is mature and the parent snails can be put in. Since field snails often have the habit of mating and laying eggs in shallow water, the water level of the parent snail pond should not be too deep, and it is better to maintain a water level of 15-20cm. The stocking density of parent snails in the breeding pond with micro-flow water is 0.5-1.0kg/m3. ?

The mating and spawning of snails do not require any human help. Two weeks after the birth of the young snails, you can start feeding them with finely ground cooked egg yolk. Ensure that the young snails have sufficient bait and grow fat quickly. After about one month of intensive breeding, when the weight reaches about 0.6g, they can be moved into the adult snail pond for breeding.

Question 3: How are snails born? I just finished my meal. One of the dishes was snails, which were probably ordinary snails. I swallowed the meal without a second thought, but I still learned a little bit, that is, how snails give birth to snails. I really didn't know before. I think most people are as confused as I am. So today I'll ask a question first. Do you know how snails are born? Viviparous? Or oviparous? I'll tell you the answer tomorrow. If you answer the question, you will get a prize, and you can eat snails and drink beer. The answer will be announced on 07.07.02: Snails are ovoviviparous. Smile and Jackie in the Moon Boat answered the question correctly. I will definitely fulfill my promise. You can come to Italy to find me. I never knew there was such a way to give birth before. Either you lay eggs like chickens, or you give birth to babies directly. It turns out that snails have eggs first, and then the eggs become babies in their stomachs and then come out. Nature is really amazing. But eating those little snails during dinner is a bit disgusting, even scary. At first I thought it was sand, but after careful observation, it turned out to be some small snails with shells. This doesn't look like caviar, and you can't see the small fish at all. But the small snails have already taken shape... I can't help but lose my appetite. Legend has it that there is a dish called "Three Calls", which is made from newborn mice, and they are served alive. When you pick it up with chopsticks, it squeaks once; when you dip it in the sauce, it squeaks again; when you put it in your mouth, it squeaks three times. Not to mention seeing it in person, just thinking about it is already creepy. It shows how horrible people are. It seems that I have to avoid this breeding season when eating snails in the future.

Question 4: How can we make the field snails and stone snails reproduce faster? Field snails and stone snails are dioecious, and female individuals are generally larger than males. The male reproductive organs are composed of testes, vas deferens and testicles. The testes are located on the left side of the mantle cavity, the copulatory tube is wrapped in the right tentacle, and the genital opening is located at the top of the right tentacle. The female reproductive organs are composed of ovaries, fallopian tubes and uterus. Field snails are ovoviviparous, and embryonic development and gestation of young snails are all carried out in the body, so the uterus is particularly large. During the reproductive season, the uterus contains many young snails at different developmental stages. Under normal circumstances, it is difficult to distinguish the sex of field snails, and they can only be distinguished when they crawl and extend their tentacles. Usually, the snail with the right tentacles bent inward is the male snail, and the bent part is the male reproductive organ. The breeding season of field snails is from May to October every year, especially in June and July. The optimal water temperature for breeding is 20-26℃. Snails are animals that give birth in batches. Usually, each female snail gives birth to 2 to 6 offspring each time. Female snails aged 1 to 2 years old give birth to about 30 offspring per year; female snails aged 3 to 4 years old give birth to 30 to 40 offspring per year. The shells of newly born snails are soft and white, and they are more likely to be eaten by other animals. At this time, you should pay attention to protecting the young snails. As the shell grows, it gradually hardens and becomes darker in color.

The breeding cycle of field snails is 12 months. Generally, young snails born in July and August reach sexual maturity in May of the following year, and can be used for reproduction and giving birth in August. In addition to catching natural snail species, parent snails for breeding can also be introduced from farmers. Since field snails are sensitive to dissolved oxygen in water, they will not eat much if the dissolved oxygen in the water is lower than 3.5 mg/L, and there is a risk of death when it drops to 1.5 mg/L. Therefore, the parent snail pool should maintain rich dissolved oxygen and it is better to build a micro-flow water pool. Before stocking parent snails, mix chicken manure and broken straw in a ratio of 3:1 and pile them at the bottom of the pool to cultivate natural bait. After 1 to 2 weeks, the compost is decomposed and the parent snails can be put in. Since field snails often have the habit of mating and laying eggs in shallow water, the water level of the parent snail pool should not be too deep, and it is better to maintain a water level of 15 to 20 cm. The stocking density of parent snails in the breeding pool with micro-flow water is 0.5 to 1.0 kg/m3.

The mating and spawning of field snails do not require any human help. Two weeks after the birth of the young snails, they can be fed with finely ground cooked egg yolks. Ensure that the young snails have sufficient food and grow faster. After about one month of intensive breeding, when the weight reaches about 0.6g, they can be moved into the adult snail pond for breeding.

3. Breeding of Commercial Snails

(I) Selection and arrangement of breeding sites

The pond for breeding snails requires flat terrain, sufficient water source, no pollution, convenient transportation, and soil layer rich in humus. Snails are very sensitive to dissolved oxygen in water. The oxygen content should be relatively sufficient and the texture should be fresh. Micro-flowing water is better. The water level in the snail pond is generally maintained at 30-40cm. The water level is slightly deepened in winter to keep the water temperature constant. The water level can be slightly lowered in early spring and early autumn to increase the water temperature. In summer, a melon shed can be built on the snail pond or water hyacinths can be planted on 1/3 of the water surface to block the sun and prevent the water temperature from being too high. By taking the above measures, the appetite of snails can be maintained and the growth of the snails can be accelerated.

Before stocking snails, the snail pond should be thoroughly disinfected with drugs. The disinfection method is the same as that of ordinary ponds. Secondly, apply enough basal fertilizer to cultivate natural bait. The best basal fertilizer is well-rotted livestock and poultry manure, because it contains more humus.

(II) Release of young snails

The stocking of young snails should be carried out in the morning when the weather is clear. The young snails should be released in batches and phases from late May to early October. Usually 40,000 to 50,000 young snails can be released in 667m2.

(III) Feeding

The sources of snail feed include: natural feed and artificial feed.

1. Natural feed: Use fertilizers to cultivate floating plants and animals in the water and their bottom organic matter.

2. Artificial feed: artificially feed livestock and poultry manure and livestock and poultry viscera, small fish and shrimp, green vegetables, rice bran, etc. It is best to mix animal feed and plant feed after crushing. Because the snails use their radula to lick the feed, it is more appropriate to soak the feed in water to soften it before feeding it.

Artificial feed is fed once every 3 to 4 days, mainly in the morning. The feeding amount depends on the situation, generally 10% to 30% of the snail body weight. No feed is given in winter. When feeding, pay attention to the snail's eating habits and water quality changes. The growth of the snail should not be affected by insufficient feed, nor should the water quality deteriorate and the cost increase due to excessive feed.

(IV) Daily management

The cultivation of snails requires fresh water, rich dissolved oxygen, appropriate pH value, natural bait...>>

Question 5: Does anyone know: How to breed snails? How long is the growth cycle of snails? Breeding technology

1. Choose the right snail species. Snail species can be collected from rice fields, ponds, and ditches. Parent snails should be selected with light color, thin shell, round body, large size, intact ear shell, and complete operculum. Female field snails are large and round, with equal-sized antennae on the left and right of the head, and extend forward. Male snails are small and long, with the right antennae on the head thicker and shorter than the left antennae, and the end is bent inward to the right. The bent part is the reproductive organ. The ratio of male and female snails is 8:2 for breeding.

2. Prepare the breeding site. You can build a pond for single breeding, or use rice fields, ditches, ponds for breeding, or fish and snails can be mixed. The single snail breeding pond should be built in a place with convenient drainage and no wastewater pollution. The width of the pond is 1.5 meters, the water depth is 35-45 centimeters, and the length is unlimited. A levee about 20 centimeters above the water surface is built on the edge of the pond, and an inlet and outlet are opened at the diagonal corner of the pond, and an escape prevention net is set. Artificial breeding must also be covered with a silt layer of one tripod thickness. Algae, water lilies, red duckweed and other aquatic plants should be cultivated on the surface of the pond for the snails to eat, shade and live in.

3. Release and raise the snails. The best reproductive period is from April to October, and the optimal growth temperature is 20℃～27℃. The fertilized eggs develop into young snails in the female snail nursery. A female snail can produce 20 to 30 young snails each time, and can produce more than 150 a year. They can eat 2 to 3 weeks after giving birth. In artificial ponds, 100 to 150 parent snails are placed per square meter; in natural waters, 15 to 25 are placed per square meter. Snails have a very mixed diet and can be fed with green vegetables, bean cakes, rice bran, sweet potatoes, insects, fish and shrimp, and animal viscera and scraps. Solid baits should be soaked first, fish and shrimp, animal viscera should be chopped, and then mixed with rice bran or bean cake, wheat bran, and then dispersed for feeding. Feed once a day at 8 or 9 am, and the daily feeding amount is 1% to 3% of the snail's body weight, and it increases or decreases with weight gain and food intake. For more fertile rice fields and fish-snail mixed culture ponds, which have abundant natural bait, less or no bait can be added.

4. Strengthen management. Snails will die when the dissolved gas per liter of water is less than 1.5 mg or the water temperature exceeds 40 ℃. In order to promote the rapid growth of snails, in the hot season of spring and autumn when snails are feeding vigorously, in addition to planting aquatic plants in the breeding pond in advance to provide shade and escape the heat, it is also necessary to use running water to irrigate the pond and breed in a semi-flowing water method to reduce the water temperature and increase dissolved oxygen. When the snails have internal overflow and calcium deficiency after the operculum shrinks, fish meal, shell powder, etc. should be added to the bait. The operculum sinks into the shell because the bait is insufficient, and the feeding should be increased. Omnivorous and carnivorous species such as fish and perch cannot be raised in snail ponds. It is strictly forbidden to apply pesticides in snail fields or allow water sources with pesticides to flow in.

Question 6: How long is the breeding cycle of field snails? 1. Breeding water

Snails have strong adaptability and few diseases. As long as they are protected from large amounts of pesticides and fertilizers, they can be raised in many flat rivers, streams, pits, rice fields, ponds and other ordinary water bodies in rural areas. Keep the bottom mud 10cm-15cm thick and the area is not limited. If it is an open water body, a small amount of red duckweed and water lilies can be cultivated on the water surface, some long-vine melons and vegetables can be planted around the pond to provide shade, and bamboo can be arranged in the water.

Tail, branches or stones, grass, etc. are used as shelter for snails. Ten days before the release of snails, 50kg-100kg of quicklime is applied to the whole pond to remove wild fish, shrimp and other miscellaneous snails at a rate of 1/15 hectare. After 3-4 days, organic fertilizers and breeding bait organisms are piled in the water body for snails to eat.

2. Stocking of snails

It is best to stock the snails in the early stage of snail breeding. The sources of snails are: one is wild collection, the other is market collection. Select fresh snails with light brown color, thin and complete shells, and blunt domes. Generally, 0.1kg-0.5kg of snails are stocked per square meter in natural extensive water bodies, and the amount of stocking can be increased by 2-3 times in intensive breeding ponds. Farmed snails can be stocked alone, or some silver carp and bighead carp can be raised together, or snails and loaches can be mixed.

3. Feeding and management

In the extensive breeding method in natural waters, it is only necessary to maintain the fertility of the water body and apply an appropriate amount of manure, chicken manure, cow manure, pig manure or straw and other organic fertilizers at regular intervals to meet the growth needs of field snails. In the case of high-density intensive breeding, artificial bait must be added. Field snails do not have high nutritional requirements. Simply using rice bran, wheat bran, and soybean powder in a ratio of 60%, 25%, and 15% can become a superior feed for field snails.

According to the snails' eating habits and climate conditions, when the temperature is suitable for their growth (i.e. 20℃-28℃), the snails have a strong appetite and can be fed once every two days, with each feeding amount being 2%-3% of their body weight. When the water temperature is between 15℃-20℃ and 28℃-30℃, feed them twice a week, with each feeding amount being about 1%. When the temperature is below 15℃ or above 30℃, feed less or nothing.

4. Daily management work

It is strictly forbidden to flow into water sources polluted by pesticides and fertilizers; prevent ducks, snakes, rats, birds and other pests from invading; remove weeds and grass roots in the water in time. Usually, use micro-flow water to keep the water level at about 30cm. Increase the water flow in high temperature seasons to control the water temperature and ensure sufficient dissolved oxygen in the water. In cold weather, snails hibernate in the soil. At this time, change the water once or twice a week, and sprinkle some chopped straw into the water to facilitate the snails to overwinter.

5. Harvest and transportation

After a year of careful breeding, the weight of the young snails can reach 10g-20g, and the snails hatched that year can reach a size of more than 5g.

When harvesting snails, we adopt the method of catching the big ones and leaving the small ones, and market them in batches. We selectively take the adult snails, keep the young snails, and pay attention to selecting some female snails to achieve natural replanting, so that there is no need to release seedlings in the future. According to their living habits, in the hot summer and autumn seasons, we choose to pick them up on the bamboo branches and grass handles rotating on the shore or in the water in the early morning and at night; in winter and spring, we choose to pick them up at noon on sunny days. In addition, we can also harvest snails by catching them in the pond or picking them up by draining the pond. The transportation of snails is very simple. They can be placed in ordinary bamboo baskets, wooden barrels, etc., or packed in woven bags. During transportation, just keep the snails moist and prevent them from being exposed to the sun.

Question 7: How to raise snails? Last year, I picked up a snail outside and raised it in a small basin. It didn't move at all and I thought it was dead. I created an environment for the snail to adapt to. The suitable temperature for its survival is 20℃ 28℃, and the water temperature is below 10℃ or