Hatching of eggs of cultured snails

In the process of cultivating field snails, the first thing is to understand the growth habits of field snails, and the second is to understand its culture methods, but no matter how much written knowledge is read, sometimes it can only be theoretically applied to farming. It still needs to be decided by the breeders according to the situation.

Hatching of eggs of cultured snails

In order to improve the hatching rate, the hatching of snail eggs should use a bamboo screen to set up an incubation bed (such as bamboo foil) 30 cm above the water surface of the hatchery pond (ditch). The top of the hatchery bed is covered with a film, and shade is placed on the film to prevent rain and sunlight, and put some duckweed in the incubator (ditch). When placing egg blocks, do not pile up, but should be tiled. The egg blocks collected every day should be placed separately. The newly laid eggs were pink. Under the condition of suitable incubation temperature 28-30X2, the eggs turned brown after 5 days and white after 10 days. When the egg turns white, the young snail is about to break its shell. After hatching, the young snail automatically falls into the water from the sieve hole, and when the top of the snail changes from red to black, the young snail can be nurtured.

The incubation time varies with the temperature, the temperature is high, the incubation time is short; when the temperature is low, the hatching time of snail eggs is long. The young snails were hatched in 29 days after 27 ℃, 8-12 days in 8-12 days and 10 days when the temperature was about 30 E. When the temperature drops below 20 ℃, it is difficult for eggs to hatch snails. If the temperature is less than 20C, the eggs should be sifted indoors, placed in a water plate in an incubator surrounded by thin film (water depth 10 cm), and heated to 28 ℃ with a 40W light bulb. The eggs of field snails will be hatched in about 11 days.

Construction of field snail culture pond

1. Selected sites for breeding: snails have strong adaptability and few diseases. As long as a large number of pesticides and chemical fertilizers are avoided, many flat canals, beaches, pits, paddy fields, ponds and other ordinary water bodies in rural areas can be stocked.

2. Pond construction: snail culture ponds are generally 1.5 meters wide, 10-15 meters long and 30-50 cm deep. 20 cm high embankments are built between the two ponds for walking, and the bottom of the pond is covered with 10 cm thick mud. Aquatic plants such as Zizania caduciflora, asparagus, water lotus, duckweed and other aquatic plants can be sparsely planted in the pond to provide sunshade, climbing habitat and bait, so as to improve the utilization rate of snail ponds. A 60-80 cm high fence or mesh fence is built around the snail pool.

3, pond disinfection: in snail culture, it is forbidden to use pentachlorophenol sodium to clear ponds, generally using quicklime or bleaching powder to clear ponds for disinfection, but quicklime is the best, the dosage is water (water depth 30-50 cm) 100-150 kg / mu, anhydrous 50-75 kg / mu, quicklime clear ponds have the advantages of increasing PH value, increasing calcium content, regulating water quality, sterilization and so on.

The culture method of field snail

1, snail selection: field snail is mostly natural reproduction, artificial culture can be picked from paddy fields, Zizania caduciflora, muddy water ditches, or go to the market to buy, and then choose fresh snails with light brown color, thin shell and obtuse body tail as species of snails. Generally, field snails weighing 15-25 grams can reach sexual maturity, and can reproduce above 15 ℃. Female snails are large and round, while males are small and sharp.

2. Stocking time: snail species can be released not only at one time, but also in batches for many times, but to improve the survival rate, it is generally necessary to avoid the time of high temperature and heat. Of course, stocking at the end of the first year is beneficial to shorten the breeding time and increase the per unit yield of the same year.

3. Stocking method: if you put 11 species snails per square meter in the natural area, you can put 11 species snails per square meter (3 males and 8 females). If you dig a pond alone, you can put 100-500 snails per square meter, and the water depth is 0.8-1 meters. The bottom of the pond retains a layer of silt of more than 10 cm, which is convenient for snails to crawl, feed, perch, etc., and can reproduce naturally when stocking female and male snails together.

4. collocation culture: in order to regulate the water quality by raising 20-50 grams of silver carp and 5-10 bighead carps with 20-50 grams per mu, snail ponds are not suitable for raising carnivorous or carnivorous fish such as green carp, common carp, crucian carp and yellow carp.

The difference between snail and field snail

Many people think that snails are field snails, and field snails are snails, but in fact they are two kinds of things that are closely related, but they are very similar in many ways.

1. Different producing areas: snails are found only in China, while field snails are found almost all over the world.

2. Shells are different: the shell surface of snail is not as smooth as that of snail, there are many spiral rib lines on it, and there are no rib lines on the shell of snail.

3. Different sizes: field snails can grow big, but snails generally don't grow up.

4. Different habits: snails crawl underwater and must be caught with a special trawl, while snails like to live on the shore or in paddy fields.

5. The number of births: snails can only give birth to 3-7 small snails, and field snails can give birth to dozens of small snails.

6. Breeding season: snails breed continuously all the year round, while field snails only begin to breed from March to April every year.

Field snail is a more popular farming project in rural areas of our country, because the investment cost of farming field snail is low, the return profit is high, and the threshold of breeding field snail is also relatively low, so many farmers pay attention to the cultivation of field snail.