New techniques for artificial control of field snails in natural ponds

Field snail is not only a favorite fitness food, but also a bait for raising carnivorous fish. Due to overfishing, natural resources are decreasing day by day, and the prospect of developing field snail culture is promising. In recent years, our town has made great efforts to promote artificial imitation of natural ponds to raise field snails, that is, to create a good ecological environment in the ponds, to plant a small amount of water plants for field snails to perch and to avoid summer heat, and to place some branches and stones for field snails to live in different water layers. if possible, an aerator can be installed in the pond. Field snail lives in such a living environment, the general output of 667 square meters can reach 800kg ~ 1000 kg. This is a good way for rural areas to get rich and breed.

I. Infrastructure

1. Pond conditions. The requirement is not high, the area can be large or small, the general fish ponds can raise snails. The high-yield ponds that mainly raise snails require better water source and water quality. The pool ridge is more than 1 meter wide, convenient for entry and drainage, and set up block to prevent escape. It can keep the water depth of the pool 1 ~ 1.5 meters. The pond sediment is fatter but not too deep.

two。 Disinfect the pond. 7-10 days before snail release, remove excessive silt from the snail pond, maintain and tamp the ridge of the pond, and dredge the entry and drainage channels. Then the pond is disinfected, that is, 75 kilograms of quicklime water is evenly sprinkled throughout the pond for every 667 square meters, or the water is evenly sprinkled with 100 kilograms of quicklime water at the depth of 1 meter for every 667 square meters.

3. Apply enough base fertilizer. Fermented pig manure fertilizer is used as base fertilizer, 200 kg ~ 500 kg per 667 square meters, less if sediment fertilizer, and more if sediment is thin.

Second, seedling stocking. Select the individual that is larger, the shell surface is intact and undamaged, the snail body is quickly recovered from the shell when frightened, and the snail is forcefully covered with the snail mouth as the snail species. Snail species can be released not only at one time, but also in batches for many times, with 100 kg ~ 150 kg of snail species weighing 10 grams per 667 square meters, and 20 grams of 50 grams of silver carp and 50 grams of bighead carp per 667 square meters, in order to adjust the water quality, it is not suitable to breed carnivorous fish such as green, common carp, crucian carp, yellow catfish and so on. The stocking time of snail species is from March to May. In addition, if the snails come from a wide range of sources in winter at the end of the year, they can also be released in winter like fish.

III. Feeding and management

1. Throw in the bait. Artificial feeding varieties mainly include rice bran, wheat bran, rapeseed cake, bean dregs and animal scraps and so on. If the water temperature is below 15 ℃ and the water temperature is 20: 28 ℃, it is the most suitable for the field snail to feed and grow. The bait is fed once in the morning or evening every 1-2 days, and the bait is scattered all over the fixed food ground.

two。 Look at the water and manure. The water color of snail culture should be tea brown or light green, with a transparency of 20cm and 30cm, and meet the requirements of "fat, tender and cool" with high quality water body. Determine whether or not to apply fertilizer or how much according to the fertility of the water. Topdressing varieties can be used either fermented manure or chemical fertilizer. No matter what kind of fertilizer is used, a small number of times should be taken to avoid excessive application of water quality. The amount of manure fertilizer is 100 kg ~ 150 kg per 667 square meters, or 1 kg ~ 2 kg of urea.

3. Regulate the water quality. The ability of field snail to endure hypoxia is not strong, so the dissolved oxygen in water should be kept above 4 mg / L. It is found that the floating head of the fish is anoxic, or a large number of field snails climb to the surface of the water, indicating that the water body has a serious lack of oxygen, so it is necessary to turn on the aerator or add new water in time to avoid the mass death of field snails. Usually, the water quality should be observed frequently, and the oxygenation or perfusion of new water should be given in time to prevent water quality from being anoxic.

4. Prevent the snail from escaping. Field snails often escape from inlets, caves, ridges of overflow pools, etc. The pond should be inspected frequently, especially during heavy rains.

Fourth, prevention and treatment of diseases. Field snails generally have no other diseases except poor shell growth and ant disease caused by calcium deficiency. Often sprinkling quicklime into the pond can prevent and cure calcium deficiency. It is found that the leeches are trapped with grass soaked in pig blood, which has a good effect. Disease prevention generally uses quicklime, bleach, etc., and shall not use drugs that kill crustaceans such as shrimp and crabs. In addition, it is necessary to strictly guard against enemy attacks such as ducks, waterbirds and water rats.

Fifth, fishing on the market. Small snails up to 10 grams can be caught in one time or in batches and listed on the market. Pay attention to stagger the breeding season, catch the big and stay small, and prepare enough snails to continue breeding. Can take dry pool capture, can also take water with large mesh handmade net to capture, so as to catch big leakage small.