When is the snail usually released? What are the precautions?

The snail family is not only a delicacy, but also an irreplaceable animal bait with comprehensive nutritional value in river crab culture. it is not only the live bait loved by river crabs, but also can purify the water quality and remove the organic matter (humus) at the bottom of the pond mouth. If a pond mouth does not have our existence, then it will be more difficult to control water and grass in the pond mouth culture process! The possibility of raising big crabs will be very small! When is the snail usually released? What are the precautions? How to choose a good snail?

First, when is the snail usually released?

For the first time, it was completed before Ching Ming Festival, 300 jin per mu, and snails were put in before the Qingming Festival to help them accumulate nutrition. Fortunately, they began to give birth in large quantities after the Qingming Festival, and snails will be the best natural bait after the crab seedlings grow up a little.

The second time, at the end of July and the beginning of August, the amount is 200 jin / mu, providing high-quality natural bait for the soon-to-mature crabs, which can play the role of promoting yellow and promoting ointment.

It is better to put the mature small and medium-sized snails in winter, because they are the best provenance for producing snails during the Qingming Festival, and the young snails produced by adult snails in the pond will also be the best opening material for spring seedlings.

Spring snail choose big characters, release snails after the beginning of spring, screws have begun to enter the growth period, the larger the individual, the more nutrients, is the second molting, the best live bait for crabs, adequate screw supply, will be the basic guarantee for the growth of crabs.

II. Matters needing attention in the release of snails

1. The amount of the first batch of snails should not be too large, accounting for about 1 of the total amount of snails put in the whole year. If the dosage is too large, it can easily lead to clear water and difficult fertilizer in the early stage, and in serious cases, there will be an outbreak of moss.

In winter, it is better to put mature small and medium-sized snails in that year, because they are the best provenance for producing snails during the Qingming Festival, and the young snails produced by adult snails in the pond will also be the best opening material for spring seedlings; spring snails choose big characters and release snails after the beginning of spring, and the screws have already begun to enter the growing period. the bigger the individual, the more nutrients, which is the best living bait for crabs after molting for the second time, and an adequate supply of screws will be the basic guarantee for crab growth.

2. Snails with less empty shell and less mud as far as possible, and avoid carrying moss into the pond as far as possible; ② carapace is thin and easy to be crushed with feet; ③ is best to choose artificially fished carapace with a relatively high survival rate.

3. The snail should be disinfected in time the next day to prevent the introduction of harmful bacteria.

4. Fertilizer and water should be used according to the water quality after putting snails.

5. Avoid rainy and dreary weather as far as possible when throwing screws to prevent the low survival rate of screws due to the influence of weather and temperature. Under 5 ℃ in winter, snails will be frostbitten; in summer, when snails are released over 28 ℃, they will die from lack of oxygen during transportation, and being caught in the rain during transportation can easily lead to screw death, and so on.

6. Due to the early low temperature, the screws are not easy to crawl and put in piles to prevent the accumulation of screws from causing anoxic death.

7. Do a good job of detoxification before release to prevent the snail from coming ashore and diving into the sediment seriously, causing death and increasing the breeding cost.

Third, how to select snails?

1. The snail requires that the shell be intact and undamaged.

2. The snail can quickly recover from the shell when it is frightened, and the cap can cover the screw mouth forcefully.

3. There are no leeches and other parasites in the snail.

4. See whether the tail of the snail is damaged or not, so as to distinguish the snail caught by machine from the snail caught by hand.

Note: snails live in water, so do not let them be exposed to the air for a long time, so that some snails will suffocate to death due to lack of oxygen in more than 24 hours!