Crab farming technology
2024-08-24 05:01:23
Crab breeding pond conditions:
Convenient transportation, quiet environment; abundant water, good water quality, pollution-free, convenient drainage and irrigation; pool bottom leveling, pond slope ratio 1: 2.5-3.
Anti-escape facilities:
There are mainly three types of cement brick walls, calcium plastic plate fences, and polyethylene mesh fences. At present, calcium plastic fences are commonly used. The calcium-plastic composite plates are compacted 20 cm around the concrete in the earthen bowl and fixed at intervals of 1 m with wooden stakes.
Sterilize the clear pond:
Remove excess silt, leaving only about 10 centimeters of silt, splashing with quicklime, 200-250 kg per acre, complete disinfection of clear ponds, removal of wilderness, killing bacteria, improving sediment quality, after medicine 7 days, that is, water 1 time to remove the dirt, and then add water after 3-5 days.
Crab pond should plant species:
To cultivate a pond crab, we must first plant a pond grass. The water grass is one of the natural foods eaten by crabs, and it can also play a role in purifying water quality. It is also a place for crabs to inhabit and avoid predators. The area of ​​aquatic weeds should account for more than 70% of the area of ​​ponds. The main species include black algae, Vallisneria, Elodea and so on. The black-leaf algae and Elodea species are mainly transplanted and cuttings are introduced, and the plants are planted by sowing.
Crab ponds should be placed screws:
Screws are one of the natural foods that crab eats and can purify water. Before the stocking of crabs and the market and, put 300-500 kilograms of live screws per mu, in order to cultivate the basic bait of crabs.
Crab species selection:
It is advisable to select the crab species of the Chinese river eel in the Yangtze River water system with neat specifications, complete appendages, no disease, no injury and quick action.
Crab pond reasonable stocking:
General stocking of crabs needs to be “three types†and “one temporary raiseâ€, that is, proper density, timely stocking, appropriate specifications, and stocking after first holding. The stocking density of crabs is generally about 500--600 per acre, so that the crabs have ample space for life and growth. The time for the stocking of crabs is generally appropriate from the end of February to March of each year. If the stock is released prematurely, In winter, the number of casualties is heavier. When the water temperature rises too late, some of the crab shells will affect the survival rate of the lower pond. The stocking size of crabs should be 100--200 per kilogram. The size is too large. Each time the first shell is difficult, the damage is heavier; if the size is too small, the growth base is not large, affecting the market specifications. The temporary conservation of crabs is a transitional phase before the stocking of crabs. It is necessary to first set up a “holding zone†in the pool. The length of the holding period should be determined by the water temperature and the growth of aquatic plants in the pond. The area is about 1/5 of the stocking area.
Scientific and reasonable feeding materials:
Crab is an omnivorous animal of a partial eclipse. In the feeding of bait, strict implementation of the scientific method of "four determinations and four readings" and mastering the principles of "preliminary fineness, intermediate greenness, and meat quality matching". Feed each time in the morning and evening, and the daily feeding amount generally accounts for 3--4% of crab body weight, and it is advisable to eat within 1--2 hours. In the initial stage of stocking, mainly animal feeds, mainly fresh fish, snail meat, etc., and then gradually increase the amount of vegetative concentrate feed, such as wheat, corn, soybean meal, etc., in high temperature season, do not cast For animal diets, less vegetable essence baits, and more crude fodder such as aquatic plants, pumpkins, potatoes, etc., enter the late stage of cultivation, for the river crab to promote growth and weight gain stage, it is necessary to increase the botanical concentrate feed and animal bait to ensure the crab Eat enough to eat.
Crab pool water quality control:
The general water depth is maintained at 0.6--0.8 meters, and the high-temperature season is adjusted to 1-1.2 meters. The adjustment of water quality focuses on three aspects: First, constantly changing new water, generally changing the water once every 7-10 days. When high temperature, inject water 10-20 centimeters per day and change the water once every 3 days. The second is to adjust the pH of the water body, generally in the PH value of 7.5--8.5. The main use of quicklime adjustment, 7--10 days Quanchiposa 1 time, the amount of water per acre per meter of about 10-15 kg. The third is to use photosynthetic bacteria to regulate water quality, 3-3-5 kilograms per acre, the whole pool pouring water in order to transform the body of ammonia, nitrogen, hydrogen sulfide and other harmful substances, control the breeding and breeding of harmful bacteria.
Crab fishing:
Generally in October, according to the temperature and market conditions, timely fishing market, the main tool is the cage.
Convenient transportation, quiet environment; abundant water, good water quality, pollution-free, convenient drainage and irrigation; pool bottom leveling, pond slope ratio 1: 2.5-3.
Anti-escape facilities:
There are mainly three types of cement brick walls, calcium plastic plate fences, and polyethylene mesh fences. At present, calcium plastic fences are commonly used. The calcium-plastic composite plates are compacted 20 cm around the concrete in the earthen bowl and fixed at intervals of 1 m with wooden stakes.
Sterilize the clear pond:
Remove excess silt, leaving only about 10 centimeters of silt, splashing with quicklime, 200-250 kg per acre, complete disinfection of clear ponds, removal of wilderness, killing bacteria, improving sediment quality, after medicine 7 days, that is, water 1 time to remove the dirt, and then add water after 3-5 days.
Crab pond should plant species:
To cultivate a pond crab, we must first plant a pond grass. The water grass is one of the natural foods eaten by crabs, and it can also play a role in purifying water quality. It is also a place for crabs to inhabit and avoid predators. The area of ​​aquatic weeds should account for more than 70% of the area of ​​ponds. The main species include black algae, Vallisneria, Elodea and so on. The black-leaf algae and Elodea species are mainly transplanted and cuttings are introduced, and the plants are planted by sowing.
Crab ponds should be placed screws:
Screws are one of the natural foods that crab eats and can purify water. Before the stocking of crabs and the market and, put 300-500 kilograms of live screws per mu, in order to cultivate the basic bait of crabs.
Crab species selection:
It is advisable to select the crab species of the Chinese river eel in the Yangtze River water system with neat specifications, complete appendages, no disease, no injury and quick action.
Crab pond reasonable stocking:
General stocking of crabs needs to be “three types†and “one temporary raiseâ€, that is, proper density, timely stocking, appropriate specifications, and stocking after first holding. The stocking density of crabs is generally about 500--600 per acre, so that the crabs have ample space for life and growth. The time for the stocking of crabs is generally appropriate from the end of February to March of each year. If the stock is released prematurely, In winter, the number of casualties is heavier. When the water temperature rises too late, some of the crab shells will affect the survival rate of the lower pond. The stocking size of crabs should be 100--200 per kilogram. The size is too large. Each time the first shell is difficult, the damage is heavier; if the size is too small, the growth base is not large, affecting the market specifications. The temporary conservation of crabs is a transitional phase before the stocking of crabs. It is necessary to first set up a “holding zone†in the pool. The length of the holding period should be determined by the water temperature and the growth of aquatic plants in the pond. The area is about 1/5 of the stocking area.
Scientific and reasonable feeding materials:
Crab is an omnivorous animal of a partial eclipse. In the feeding of bait, strict implementation of the scientific method of "four determinations and four readings" and mastering the principles of "preliminary fineness, intermediate greenness, and meat quality matching". Feed each time in the morning and evening, and the daily feeding amount generally accounts for 3--4% of crab body weight, and it is advisable to eat within 1--2 hours. In the initial stage of stocking, mainly animal feeds, mainly fresh fish, snail meat, etc., and then gradually increase the amount of vegetative concentrate feed, such as wheat, corn, soybean meal, etc., in high temperature season, do not cast For animal diets, less vegetable essence baits, and more crude fodder such as aquatic plants, pumpkins, potatoes, etc., enter the late stage of cultivation, for the river crab to promote growth and weight gain stage, it is necessary to increase the botanical concentrate feed and animal bait to ensure the crab Eat enough to eat.
Crab pool water quality control:
The general water depth is maintained at 0.6--0.8 meters, and the high-temperature season is adjusted to 1-1.2 meters. The adjustment of water quality focuses on three aspects: First, constantly changing new water, generally changing the water once every 7-10 days. When high temperature, inject water 10-20 centimeters per day and change the water once every 3 days. The second is to adjust the pH of the water body, generally in the PH value of 7.5--8.5. The main use of quicklime adjustment, 7--10 days Quanchiposa 1 time, the amount of water per acre per meter of about 10-15 kg. The third is to use photosynthetic bacteria to regulate water quality, 3-3-5 kilograms per acre, the whole pool pouring water in order to transform the body of ammonia, nitrogen, hydrogen sulfide and other harmful substances, control the breeding and breeding of harmful bacteria.
Crab fishing:
Generally in October, according to the temperature and market conditions, timely fishing market, the main tool is the cage.
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