I. Shrimp pond cleaning and disinfection
Shrimp ponds require ventilation to sunny, abundant water, an area of ​​667 - 1334 square meters (1 - 2 acres), water depth 1 - 1.5 meters. In actual breeding, there should normally be two to three such shrimp ponds for use. Before breeding, the shrimp ponds are first cleaned, excess silt is removed, and the pools are reinforced to make the ponds shallow and deep in the pool. Next, the shrimp ponds are disinfected and 100-150 kilograms of lime are used per 667 square meters. The whole pool is covered with hot water, or 15 to 20 kg of bleaching powder or 1.5 to 2 kg of sodium pentachlorate per 667m2 water depth is sprayed all over the pond to kill the pests and diseases in the pool.
Before stocking the hatching shrimps, 1 m away from the edge of the pond, plant water peanuts or other aquatic plants and fix them with ropes or nets to form aquatic weeds. The area of ​​aquatic weeds accounts for 20% to 30% of the water surface.
Second, hatching method
It is better to use egg cages for cultivating eggs and shrimps can be recovered. Incubation cage made of polyethylene net sheet 2 meters X1 meters x 0.8 meters small cage, mesh 0.8 centimeters, fixed in the pond, per square meter of oyster shrimp 0.5 - 1 kg, every 667 square meters Put 4 to 5 kilograms of rice. The oviposition shrimps should be selected in the non-polluted river waters, and the females with 5 cm in length and long egg development are close to each other. The specific method of hatching is to put 2-3 times of spawning shrimp into the first pond to hatch, wait for 1/3 or 1/2 of the spawning shrimp to empty, and move the rest of the spawning shrimps into the cages. The two ponds continue to hatch and then move into the third pond to allow all the egg-bearing shrimp to empty.
Third, shrimp cultivation
The hatched seed should do the following in the cultivation phase
1. During the incubation of basic baits, periodically sample and inspect egg-holding shrimps. When the color of the fertilized eggs changes from orange to gray-brown and eye spots appear, it indicates that they are about to hatch. Organic manure should be applied to the pool to cultivate plankton for young shrimps. Feeding. Generally sterilized and fermented livestock and poultry per 150 to 250 kilograms per 667 square meters, a large number of newly excavated ponds, old ponds reduce as appropriate, after the change of water, applying fertilizer and other measures to promote bait biological breeding, to maintain palatability feed Density ensures the supply of live bait during young larvae.
2, injection water larvae after the film every day or every other day after the injection of new water, each time to increase the water level of 5 - 7 cm, so that the water remains fresh, high dissolved oxygen. After 10 days, generally 5-7 days of water injection or water change 1 times, change the amount of water for the 1/4 of the pond water; high temperature season, change the water every other day, pool water should not be too deep, or affect the growth of plankton , And easy to cause hypoxia in the bottom of the pond, the maximum water level is controlled at 1 - 1.5 meters. Water inlet 60 - 80 mesh sieve double layered to prevent pests from entering the pool with water.
3, depending on the water quality conditions, depending on the water conditions, generally 5 - 7 days top dressing 1, per 667 square meters of fermented livestock and poultry excrement 75 - 100 kg or inorganic fertilizer plus calcium phosphate - 2 kg to maintain water quality Fertilizer, live, and cool, the transparency of the water remains between 30 and 40 meters.
4, feeding bait larvae from the mother's body after the first two days of intake of external nutrition to maintain their own growth and activity required for energy. During the period from juvenile larvae to juveniles, they mainly use natural foods (plankton) and artificial feeding of soymilk and yolk. While cultivating the basic bait for larval consumption, it must be supplemented with appropriate amount of artificial bait every day. In the initial period, every day, 667 square meters are fed with 1 to 1.5 kg of filtered soybean milk or 4 to 6 chopped and filtered egg yolks. When feeding egg yolks, the speed is slow, because egg yolks are easy to sink. Feeding time, feeding 3 times a day and night, 8 o'clock in the morning, 4 o'clock in the afternoon, and 1 o'clock in the evening at 12 o'clock. At present, most production units vote twice a day, that is, 8 to 9 am and 5 to 6 pm. The amount of feed in the morning was less, accounting for 1/3 of the day, and the amount of feed in the afternoon accounted for 2/3 of the day. The method of feeding is: a combination of splashing and pouring to ensure that the vast majority of larvae get food. One week later, 1.5 to 2 kg of non-filtered soybean milk was fed daily. After 15 days, the larval metamorphosis basically ended and the camp benthic life could be fed peanut cake or bean cake, wheat flour, bean dregs, fish gizzard or larvae pellet feed. The daily feeding amount is 0.3-0.5 kg per 10,000. The feeding point is in the shallow water area of ​​50 cm in the morning, and the feeding point in the afternoon is generally along the foot of the pool. With the growth of the shrimp, fresh live bait, such as snails and quail meats, are added appropriately, and the proportion of live bait is gradually increased. A number of oysters can be set in the pool to check food intake.
5, water disinfection during larval rearing, every 10 days per 667 square meters 1 meter depth with quicklime 15 - 20 kilograms of pulp and hot Quanchiposa, in the adjustment of pH can also play a role in water disinfection, calcium And it helps to grow the molting of the shrimp.
6. In time, the pond is cultivated for 20-30 days. The larvae are repeatedly molted. The appendages of the chest and abdomen have been fully developed. The appearance is the same as that of the shrimp. The body length is about 1 cm. When the swimming jumping force is strong, it should be timely. Capture fish, divide ponds and conduct shrimp farming. Pull the net slowly to prevent the shrimp from suffocating.
Through the above management methods, in general, per gram of wintering egg-holding shrimp, approximately 100,000 juveniles with a body length of about 1 cm can be bred.
Shrimp ponds require ventilation to sunny, abundant water, an area of ​​667 - 1334 square meters (1 - 2 acres), water depth 1 - 1.5 meters. In actual breeding, there should normally be two to three such shrimp ponds for use. Before breeding, the shrimp ponds are first cleaned, excess silt is removed, and the pools are reinforced to make the ponds shallow and deep in the pool. Next, the shrimp ponds are disinfected and 100-150 kilograms of lime are used per 667 square meters. The whole pool is covered with hot water, or 15 to 20 kg of bleaching powder or 1.5 to 2 kg of sodium pentachlorate per 667m2 water depth is sprayed all over the pond to kill the pests and diseases in the pool.
Before stocking the hatching shrimps, 1 m away from the edge of the pond, plant water peanuts or other aquatic plants and fix them with ropes or nets to form aquatic weeds. The area of ​​aquatic weeds accounts for 20% to 30% of the water surface.
Second, hatching method
It is better to use egg cages for cultivating eggs and shrimps can be recovered. Incubation cage made of polyethylene net sheet 2 meters X1 meters x 0.8 meters small cage, mesh 0.8 centimeters, fixed in the pond, per square meter of oyster shrimp 0.5 - 1 kg, every 667 square meters Put 4 to 5 kilograms of rice. The oviposition shrimps should be selected in the non-polluted river waters, and the females with 5 cm in length and long egg development are close to each other. The specific method of hatching is to put 2-3 times of spawning shrimp into the first pond to hatch, wait for 1/3 or 1/2 of the spawning shrimp to empty, and move the rest of the spawning shrimps into the cages. The two ponds continue to hatch and then move into the third pond to allow all the egg-bearing shrimp to empty.
Third, shrimp cultivation
The hatched seed should do the following in the cultivation phase
1. During the incubation of basic baits, periodically sample and inspect egg-holding shrimps. When the color of the fertilized eggs changes from orange to gray-brown and eye spots appear, it indicates that they are about to hatch. Organic manure should be applied to the pool to cultivate plankton for young shrimps. Feeding. Generally sterilized and fermented livestock and poultry per 150 to 250 kilograms per 667 square meters, a large number of newly excavated ponds, old ponds reduce as appropriate, after the change of water, applying fertilizer and other measures to promote bait biological breeding, to maintain palatability feed Density ensures the supply of live bait during young larvae.
2, injection water larvae after the film every day or every other day after the injection of new water, each time to increase the water level of 5 - 7 cm, so that the water remains fresh, high dissolved oxygen. After 10 days, generally 5-7 days of water injection or water change 1 times, change the amount of water for the 1/4 of the pond water; high temperature season, change the water every other day, pool water should not be too deep, or affect the growth of plankton , And easy to cause hypoxia in the bottom of the pond, the maximum water level is controlled at 1 - 1.5 meters. Water inlet 60 - 80 mesh sieve double layered to prevent pests from entering the pool with water.
3, depending on the water quality conditions, depending on the water conditions, generally 5 - 7 days top dressing 1, per 667 square meters of fermented livestock and poultry excrement 75 - 100 kg or inorganic fertilizer plus calcium phosphate - 2 kg to maintain water quality Fertilizer, live, and cool, the transparency of the water remains between 30 and 40 meters.
4, feeding bait larvae from the mother's body after the first two days of intake of external nutrition to maintain their own growth and activity required for energy. During the period from juvenile larvae to juveniles, they mainly use natural foods (plankton) and artificial feeding of soymilk and yolk. While cultivating the basic bait for larval consumption, it must be supplemented with appropriate amount of artificial bait every day. In the initial period, every day, 667 square meters are fed with 1 to 1.5 kg of filtered soybean milk or 4 to 6 chopped and filtered egg yolks. When feeding egg yolks, the speed is slow, because egg yolks are easy to sink. Feeding time, feeding 3 times a day and night, 8 o'clock in the morning, 4 o'clock in the afternoon, and 1 o'clock in the evening at 12 o'clock. At present, most production units vote twice a day, that is, 8 to 9 am and 5 to 6 pm. The amount of feed in the morning was less, accounting for 1/3 of the day, and the amount of feed in the afternoon accounted for 2/3 of the day. The method of feeding is: a combination of splashing and pouring to ensure that the vast majority of larvae get food. One week later, 1.5 to 2 kg of non-filtered soybean milk was fed daily. After 15 days, the larval metamorphosis basically ended and the camp benthic life could be fed peanut cake or bean cake, wheat flour, bean dregs, fish gizzard or larvae pellet feed. The daily feeding amount is 0.3-0.5 kg per 10,000. The feeding point is in the shallow water area of ​​50 cm in the morning, and the feeding point in the afternoon is generally along the foot of the pool. With the growth of the shrimp, fresh live bait, such as snails and quail meats, are added appropriately, and the proportion of live bait is gradually increased. A number of oysters can be set in the pool to check food intake.
5, water disinfection during larval rearing, every 10 days per 667 square meters 1 meter depth with quicklime 15 - 20 kilograms of pulp and hot Quanchiposa, in the adjustment of pH can also play a role in water disinfection, calcium And it helps to grow the molting of the shrimp.
6. In time, the pond is cultivated for 20-30 days. The larvae are repeatedly molted. The appendages of the chest and abdomen have been fully developed. The appearance is the same as that of the shrimp. The body length is about 1 cm. When the swimming jumping force is strong, it should be timely. Capture fish, divide ponds and conduct shrimp farming. Pull the net slowly to prevent the shrimp from suffocating.
Through the above management methods, in general, per gram of wintering egg-holding shrimp, approximately 100,000 juveniles with a body length of about 1 cm can be bred.
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