The crab sets four issues

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The crab culture is currently a major breeding mode for increasing the income and improving the economic benefits of breeding in crab culture. However, according to market information, there are still some farmers who have not achieved the desired purpose after cultivation. In this article, the author will introduce the technical points of the crabs that have been raised in recent years.

I. Pond selection

The area of ​​the pond that chooses to raise the carp is preferably between 10 mu and 50 mu. The size of the pond is convenient for manual management. The pond should be able to retain water at a depth of about 1.5 meters. In addition, it is required to be close to the water source, to facilitate water drainage, and the water source should be clean and free of pollution. Convenient transportation, complete power system.

Second, pond preparation

1. Clear pond disinfection: In the idle season of the last farming cycle, the ponds are generally thoroughly cleaned in the middle and late December of each year. The clear pond drugs generally use quicklime or bleach, because these two drugs can not only kill The enemy in the dead pool, but also can kill a large number of pathogenic microorganisms in the pool.

2. Planting aquatic plants and putting on snails: According to the growth characteristics of different aquatic plants, do a good job in the arrangement of water and grass cornices in the pool so that the varieties can be properly matched to ensure that the grasses in the breeding process do not get rid of grasses. Generally, the area of ​​aquatic plants accounts for 50% of the pond area. ~60% or so. The aquatic herb has three functions: one is to provide a sheltered place for the crab shell, and to avoid the soft shell crab; the second is to provide breeding grounds for the breeding of wild fish brought in when the water enters. The wild fish is used for squid; the third is to hide the squid so as to facilitate the hunting of wild fish. In addition, about 500 kilograms of live snails before and after the Ching Ming period provide biological live bait for river crabs.

Third, seed stocking

From mid-February to early March, 500 to 600 crab species of 120 to 160/kg are stocked per acre. The species required for stocking are robust, with complete appendages, neat specifications, and strong activity capabilities in late May. In early June, 6 to 8 centimeters of carp species (10 to 15 tails per mu) will be planted, and another 20 to 25 pterophorus species will be consumed per acre to consume plankton in the water to improve water quality.

Fourth, daily management

1. Feeding of bait: Under normal circumstances, the feeding of crab feed is the main method. Set fish need no additional feed bait. For example, if there are few bait fish, one to two kilograms of egg-bearing prawns can be placed in the pool. The hatched prawns can be used as supplementary feed for carp, and part of the two winter carp can be stocked in the pond to make it natural. Breeding provides squid fish with palatable baits, and generally stocks 5 to 6 groups of squid per mu of pond, with a ratio of 2:1.

2. Water quality regulation: The crab enjoys a refreshing water environment, and the carp has poor resistance to hypoxia. Therefore, special attention should be paid to the improvement of water quality. The main measures are: 1Sprinkle lime and splash lime with 10~15kg of lime per acre per month. 2 Spilled EM bacteria, EM bacteria can increase the dissolved oxygen in water, improve crab product specifications, reduce feed coefficient, improve water quality, reduce disease, improve survival rate. 3 focus on improving the bottom quality, from September to September every 15 to 20 days with a bottom quality improver, it can purify water, reduce ammonia, hydrogen sulfide, eliminate heavy metal ions and nitrite, improve the waters sediment environment. 4 often change the water, usually every 15 days before May, add water once every 6 to 8 months, once every 7 to 10 days, a clean water, add water time to the day is appropriate to keep the water dissolved oxygen is not less than 5 mg / liter.

3. Disease prevention and control: Adhere to the principle of “prevention from prevention and prevention from over-regulation.” Since catfish is a special aquatic product and crabs are crustaceans, they are more sensitive to drugs than ordinary fish. Therefore, Carefully choose the type of drug when administering the drug. Dosage must be calculated accurately. In the summer hot season, it is best to use quicklime or biological agents to improve the water environment every 15 to 20 days to reduce the incidence of salmon and crabs.

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