Rice fields grow crabs and rice and crabs are symbiotic and mutually beneficial. Crabs can be used to remove insects, weeds, loose soil and increase fertilizers in rice fields. Rice fields can provide a good habitat for crabs. Rice field crabs, a dual-purpose water, a double income.
Crabs for crab cultivation I. Preparation of plots
1. Selection of plots: The plots have good water retention, low salinity content in soil, and strong flood control capability. Fresh water is abundant and pollution-free.
2. Field trimming: The first step is to dig a ditch in the paddy field. The ditch width is 1.1-1.2 meters, the ditch is 0.4-0.5 meters deep, and the ring ditch is 0.5-1.0 meters away from the ridge. A holding pool is established in the paddy field, which accounts for about 10% of the paddy field area and communicates with the ditch.
3, Qingtian disinfection: 60-70 kg of lime per acre, the whole field of chemical slurry spilled, with water disinfection, the old crab field can increase the dose. Holding ponds use 150 pounds of quicklime per acre.
4. Anti-escape and anti-enemy: Use a plastic sheet with a height of 60-70cm, bury 10cm in the soil, and the remaining 50-60cm on the ground. All fields are encircled and the corners are curved.
Second, rice cultivation and management
1. Rice Variety Rice varieties with mid-late ripening varieties that are resistant to lodging, disease resistance, and fertilizer resistance are selected.
2. Transplanting pods with normal planting, planting in the ditch and holding pond.
3, fertilization can use chemical fertilizers, using a small number of methods. It is strictly prohibited to use ammonium bicarbonate, ammonia, etc., which are highly volatile and irritating fertilizers.
4. Weeding pesticides use low-toxicity and low-residue pesticides.
Control insects, use low toxicity and low residue pesticides.
Note: The powder is sprayed when the dew is not dry in the early morning. The liquid agent is sprayed after the dew is dry, and the spray nozzle sprays upward when spraying, so as to spray the medicine on the leaf surface as much as possible. Change the water promptly after application.
Third, crab stocking
1. Apply fertilizer 3-4 ppm urea to feed bait organisms in advance of the big eye larvae 6-7 days before entering the pool.
2. Crabs are stocked in paddy fields to raise crabs, generally adopting two-stage feed raising methods, that is, firstly raising them to temporary holding, and then digging the holding tanks to raise them after half a month.
In addition, the rice larvae were magnified 0.7-1.1 pounds per mu of paddy field, and were first concentrated in the holding tank. The rice field is repeatedly washed with water several times before sub-seedling to minimize the residual pesticide concentration.
IV. Breeding management
1. Feeding is the key to cultivating crabs. To increase the survival rate and control precocity, all must use the bait reasonably.
2. During the holding period, feeding should be based on concentrates to increase the survival rate of big-eyed larvae and crabs in the first few stages. Big-eyed larvae should be cast in water for a long time in the bait, frequency cast. The feeding amount of big eye larvae should be 100-150% of the stock of large-eyed larvae, and after becoming a crab, gradually reduce the proportion of feeding.
Large-eyed larvae have miscellaneous fish and miscellaneous shrimps. The miscellaneous fish and miscellaneous shrimps must be puddled in water and sprinkle water. After becoming Phase I larval crabs, feeding and bigeye larvae are different. Before Phase III larval crabs, fine concentrates are still needed. Varieties can still be used as miscellaneous fish and miscellaneous shrimps. The bait is crushed and thrown into shallow water near the pool.
After raising from the holding pool, the bait is mainly made of coarse material and gradually adopted a transition. Crab is omnivorous and there are many types of bait. Animals such as fish, shrimp, insect larvae, silkworms, etc.; vegetable such as vegetables, tender grass, duckweed, bean cake, wheat bran, corn flour, rice bran and so on. Daily feeding 2-3 times, accounted for 1/3 of the total daytime during the day, and 2/3 of the total daily amount at night to adapt to feeding habits at night.
The feeding of deducted crabs must be arranged according to the specifications to prevent premature precociousness caused by excess nutrients. The general principle is to “precise and thick, first and then less.†If you find that the specifications are larger, you can spot rough or not feed.
3, change the water holding pool to exchange water quality in time. The depth of paddy field should be kept above 5cm (this does not affect the normal growth of rice). Depending on the condition of water quality, the number of water changes and the amount of water changed can be determined flexibly.
4. After taking the big eye larvae into the holding pool, one can take 1-2ppm of oxytetracycline and 0.5-1ppm of nitrofurazone. The entire pool is splashed evenly. During the period of crab cultivation, 10kg of lime slurry per acre is sprayed per acre and the calcium is disinfected.
For the preparation of crab breeding plots, the cultivation and management of rice can be referred to crab farming.
One, crab species stocking
1, stocking density
350-650/mu, not more than 1000/mu.
2, stocking density
40-60/kg, sexual immature deduction crabs, specifications should not be less than 120/kg.
3, stocking time crab species first held in the holding pool, until the rice seedlings grow to 30cm, and then to the field of subculture.
Second, aquaculture management
1, feeding bait in the holding pool concentrates, because the crab after 4-5 months of long winter, the body is depleted of nutrients, feeding high-quality food, prompting the restoration of physical fitness as soon as possible to ensure the smooth escape of the first shell The amount of fish that can be fed is 10-15% of the total amount of crabs in the pool.
Breeding late breeding materials, to promote crab fattening.
Daily feeding 2 times, 1 time in the morning and 1 time in the evening, the amount of the evening accounted for 2/3 of the total daily amount.
2. The water quality regulation will exchange water quality in time depending on the water quality. Each month, 10kg of lime is used for seedlings, and the field is splashed with water.
Crabs for crab cultivation I. Preparation of plots
1. Selection of plots: The plots have good water retention, low salinity content in soil, and strong flood control capability. Fresh water is abundant and pollution-free.
2. Field trimming: The first step is to dig a ditch in the paddy field. The ditch width is 1.1-1.2 meters, the ditch is 0.4-0.5 meters deep, and the ring ditch is 0.5-1.0 meters away from the ridge. A holding pool is established in the paddy field, which accounts for about 10% of the paddy field area and communicates with the ditch.
3, Qingtian disinfection: 60-70 kg of lime per acre, the whole field of chemical slurry spilled, with water disinfection, the old crab field can increase the dose. Holding ponds use 150 pounds of quicklime per acre.
4. Anti-escape and anti-enemy: Use a plastic sheet with a height of 60-70cm, bury 10cm in the soil, and the remaining 50-60cm on the ground. All fields are encircled and the corners are curved.
Second, rice cultivation and management
1. Rice Variety Rice varieties with mid-late ripening varieties that are resistant to lodging, disease resistance, and fertilizer resistance are selected.
2. Transplanting pods with normal planting, planting in the ditch and holding pond.
3, fertilization can use chemical fertilizers, using a small number of methods. It is strictly prohibited to use ammonium bicarbonate, ammonia, etc., which are highly volatile and irritating fertilizers.
4. Weeding pesticides use low-toxicity and low-residue pesticides.
Control insects, use low toxicity and low residue pesticides.
Note: The powder is sprayed when the dew is not dry in the early morning. The liquid agent is sprayed after the dew is dry, and the spray nozzle sprays upward when spraying, so as to spray the medicine on the leaf surface as much as possible. Change the water promptly after application.
Third, crab stocking
1. Apply fertilizer 3-4 ppm urea to feed bait organisms in advance of the big eye larvae 6-7 days before entering the pool.
2. Crabs are stocked in paddy fields to raise crabs, generally adopting two-stage feed raising methods, that is, firstly raising them to temporary holding, and then digging the holding tanks to raise them after half a month.
In addition, the rice larvae were magnified 0.7-1.1 pounds per mu of paddy field, and were first concentrated in the holding tank. The rice field is repeatedly washed with water several times before sub-seedling to minimize the residual pesticide concentration.
IV. Breeding management
1. Feeding is the key to cultivating crabs. To increase the survival rate and control precocity, all must use the bait reasonably.
2. During the holding period, feeding should be based on concentrates to increase the survival rate of big-eyed larvae and crabs in the first few stages. Big-eyed larvae should be cast in water for a long time in the bait, frequency cast. The feeding amount of big eye larvae should be 100-150% of the stock of large-eyed larvae, and after becoming a crab, gradually reduce the proportion of feeding.
Large-eyed larvae have miscellaneous fish and miscellaneous shrimps. The miscellaneous fish and miscellaneous shrimps must be puddled in water and sprinkle water. After becoming Phase I larval crabs, feeding and bigeye larvae are different. Before Phase III larval crabs, fine concentrates are still needed. Varieties can still be used as miscellaneous fish and miscellaneous shrimps. The bait is crushed and thrown into shallow water near the pool.
After raising from the holding pool, the bait is mainly made of coarse material and gradually adopted a transition. Crab is omnivorous and there are many types of bait. Animals such as fish, shrimp, insect larvae, silkworms, etc.; vegetable such as vegetables, tender grass, duckweed, bean cake, wheat bran, corn flour, rice bran and so on. Daily feeding 2-3 times, accounted for 1/3 of the total daytime during the day, and 2/3 of the total daily amount at night to adapt to feeding habits at night.
The feeding of deducted crabs must be arranged according to the specifications to prevent premature precociousness caused by excess nutrients. The general principle is to “precise and thick, first and then less.†If you find that the specifications are larger, you can spot rough or not feed.
3, change the water holding pool to exchange water quality in time. The depth of paddy field should be kept above 5cm (this does not affect the normal growth of rice). Depending on the condition of water quality, the number of water changes and the amount of water changed can be determined flexibly.
4. After taking the big eye larvae into the holding pool, one can take 1-2ppm of oxytetracycline and 0.5-1ppm of nitrofurazone. The entire pool is splashed evenly. During the period of crab cultivation, 10kg of lime slurry per acre is sprayed per acre and the calcium is disinfected.
For the preparation of crab breeding plots, the cultivation and management of rice can be referred to crab farming.
One, crab species stocking
1, stocking density
350-650/mu, not more than 1000/mu.
2, stocking density
40-60/kg, sexual immature deduction crabs, specifications should not be less than 120/kg.
3, stocking time crab species first held in the holding pool, until the rice seedlings grow to 30cm, and then to the field of subculture.
Second, aquaculture management
1, feeding bait in the holding pool concentrates, because the crab after 4-5 months of long winter, the body is depleted of nutrients, feeding high-quality food, prompting the restoration of physical fitness as soon as possible to ensure the smooth escape of the first shell The amount of fish that can be fed is 10-15% of the total amount of crabs in the pool.
Breeding late breeding materials, to promote crab fattening.
Daily feeding 2 times, 1 time in the morning and 1 time in the evening, the amount of the evening accounted for 2/3 of the total daily amount.
2. The water quality regulation will exchange water quality in time depending on the water quality. Each month, 10kg of lime is used for seedlings, and the field is splashed with water.
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