First, the preparation of the crabs before stocking The crabs are usually stocked in early September and the seedlings are natural crabs. When the last bit of shrimp is caught, you can proceed with the preparations.
1. Put a layer of plastic net clothing directly on the paddy field to prevent the shuttle crab from damaging the earthworm. The soil around the netcloth is 5cm to 20cm, and the mesh size is 4cm to 6cm. The method of directly covering the net is more convenient and cheaper than Other methods.
2. Inspection and maintenance of embankments, intake and drainage gates, and fences and other facilities. In addition, since there are crickets in the pond, the clear pond and other work should be decided according to the specific circumstances, in order to prevent the cricket poisoning in the pond.
3. Basic bait culture. In the pond, proper transparency should be maintained. Water quality is not conducive to the growth of the crab. However, if the water quality is too thin and the transparency is too high, it is not conducive to the growth of the dragonfly. It will also increase the chance of the crabs being disabled. Therefore, the transparency should be about 3Ocm.
Second, the shuttle's stocking and daily management
1. density. The stocking density of the crab is related to the size of the crab seedlings. Under the condition of polyculture with alfalfa, the crab density should not be too high. The stocking density of crab shells with a width of 5-7 cm is 800-1000 mu/mu, and the stocking density of shells with a width of 8-12 cm is 50O-800 only. Only / mu is appropriate. The proportion of males and females is 3-5:1, and the body and appendages of the crabs that are stocked are required to have intact and strong vitality.
2. Feeding. When the water temperature is appropriate, the water temperature should be 2O°C to 27°C, and the crabs should be fed more vigorously. They should fully meet their needs for bait and reduce slaughter. The type of bait is mainly small fish and shrimp. The feed rate is generally 8%-15% of the crab's body weight. According to changes in water temperature, water quality, climate and other environmental factors, appropriate adjustments are made. Especially when the water temperature decreases in the later period of culture, the feed rate should be reduced accordingly. When the water temperature is lower than 8°C, the crabs stop feeding and can not feed at this time. However, taking into account the waterlogging in the pond, it is still necessary to pay attention to fertilizer and water, and maintain appropriate transparency. In addition, the feeding site should be fixed. According to the habit of swimming crabs along the pool wall and obstacles, the bait should be placed beside the pond and obstacles, but it should not be placed in the latent area of ​​the paddock and the crab, and the residual bait should be observed constantly. Situation, timely adjustment of feeding amount. Feeding time should be in the morning and evening. Because of these two periods, the crab is the most lively and the most invigorating. The proportion of feeding is generally 30% to 40% of the daily amount of bait and 60% to 70% of the amount of bait in the evening.
3. Daily management.
(1) Observe changes in water color and maintain appropriate transparency while paying attention to changes in pH and salinity.
It is usually adjusted by changing the water.
(2) Adhere to the tour pond and check whether the dams, gates, fences, etc. are normal, and find problems in a timely manner.
(3) Pay attention to the proportion of male and female crabs and the arrest of male crabs. Male crabs die after mating, and it is appropriate to start hunting in November.
Third, whether the timing of arrests is appropriate or not, directly determines the economic interests of farmers, and should be determined in accordance with the market conditions. Generally, the time for catching crabs is before and after the Spring Festival. It can usually be caught in a crab cage or caught in a fixed net bag on the gate. All-harvesting catch crabs can be placed in dry pond water. Storks can generally be caught before the Ching Ming, that is, the first larvae of shrimps, or they can be caught after the first larvae are caught.
1. Put a layer of plastic net clothing directly on the paddy field to prevent the shuttle crab from damaging the earthworm. The soil around the netcloth is 5cm to 20cm, and the mesh size is 4cm to 6cm. The method of directly covering the net is more convenient and cheaper than Other methods.
2. Inspection and maintenance of embankments, intake and drainage gates, and fences and other facilities. In addition, since there are crickets in the pond, the clear pond and other work should be decided according to the specific circumstances, in order to prevent the cricket poisoning in the pond.
3. Basic bait culture. In the pond, proper transparency should be maintained. Water quality is not conducive to the growth of the crab. However, if the water quality is too thin and the transparency is too high, it is not conducive to the growth of the dragonfly. It will also increase the chance of the crabs being disabled. Therefore, the transparency should be about 3Ocm.
Second, the shuttle's stocking and daily management
1. density. The stocking density of the crab is related to the size of the crab seedlings. Under the condition of polyculture with alfalfa, the crab density should not be too high. The stocking density of crab shells with a width of 5-7 cm is 800-1000 mu/mu, and the stocking density of shells with a width of 8-12 cm is 50O-800 only. Only / mu is appropriate. The proportion of males and females is 3-5:1, and the body and appendages of the crabs that are stocked are required to have intact and strong vitality.
2. Feeding. When the water temperature is appropriate, the water temperature should be 2O°C to 27°C, and the crabs should be fed more vigorously. They should fully meet their needs for bait and reduce slaughter. The type of bait is mainly small fish and shrimp. The feed rate is generally 8%-15% of the crab's body weight. According to changes in water temperature, water quality, climate and other environmental factors, appropriate adjustments are made. Especially when the water temperature decreases in the later period of culture, the feed rate should be reduced accordingly. When the water temperature is lower than 8°C, the crabs stop feeding and can not feed at this time. However, taking into account the waterlogging in the pond, it is still necessary to pay attention to fertilizer and water, and maintain appropriate transparency. In addition, the feeding site should be fixed. According to the habit of swimming crabs along the pool wall and obstacles, the bait should be placed beside the pond and obstacles, but it should not be placed in the latent area of ​​the paddock and the crab, and the residual bait should be observed constantly. Situation, timely adjustment of feeding amount. Feeding time should be in the morning and evening. Because of these two periods, the crab is the most lively and the most invigorating. The proportion of feeding is generally 30% to 40% of the daily amount of bait and 60% to 70% of the amount of bait in the evening.
3. Daily management.
(1) Observe changes in water color and maintain appropriate transparency while paying attention to changes in pH and salinity.
It is usually adjusted by changing the water.
(2) Adhere to the tour pond and check whether the dams, gates, fences, etc. are normal, and find problems in a timely manner.
(3) Pay attention to the proportion of male and female crabs and the arrest of male crabs. Male crabs die after mating, and it is appropriate to start hunting in November.
Third, whether the timing of arrests is appropriate or not, directly determines the economic interests of farmers, and should be determined in accordance with the market conditions. Generally, the time for catching crabs is before and after the Spring Festival. It can usually be caught in a crab cage or caught in a fixed net bag on the gate. All-harvesting catch crabs can be placed in dry pond water. Storks can generally be caught before the Ching Ming, that is, the first larvae of shrimps, or they can be caught after the first larvae are caught.
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