Chongming County, Shanghai has taken full advantage of the resources of crab seedlings to carry out more than ten years of history in intensive fish farming ponds. Under the premise of ensuring 500 kilograms of fish per mu, roughly 15 kilograms of persimmon crabs are produced.
1? Fish Pond Condition The depth of fish ponds can be 1-2.5 meters. If there are a large number of stocking crabs, ditches 15 cm wide and 30 cm deep should be dug in the pool pots and covered with plastic film to reduce crab escape. Disinfect with clear lime or bleaching pond before stocking.
2? Fish and crabs are mainly fish and grass carp, which account for more than 65% of carp, and catfish and carp do not exceed 20%. Avoid stocking carp. An average of 100-150 kilograms of fish per acre is stocked, preferably by the end of January. Juvenile crab stocking should not be too large, usually about 5-10 grams of juvenile crabs per acre of about 300. The crabs should be stocked no later than the end of June.
3? Management 1 Feeding: According to the conventional techniques of fish farming, there is no need to increase the amount of feed or change the type of feed. 2 Water Quality Regulation: Starting from April, fill water once a week. In hot season, fill water every 2-3 days. The transparency of the pool water is maintained at more than 30 cm. 3 Prevention of Floating Head Flooding: Every morning and evening, each patrol pond is once. If it is found that the shrimp in the pond has a floating head phenomenon, immediately flush with new water or start the aerator. 4 fish disease prevention and control: the rational use of drugs to prevent fish disease, to avoid the death of crab poisoning. Crabs are very sensitive to organophosphorus pesticides such as crystal trichlorfon, methamidophos, and enemy killers, and their lethal concentrations are much lower than fish. When crystal trichlorfon must be used, hanging bags or food sprinkling may be used. Lime, bleach, copper sulphate and various oral fish medicines, if used at standard doses, generally do not affect crabs.
Absorbent is also called absorbent. This substance can make the active ingredient adhere to the surface of its particles, and make the liquid trace compound additive become a solid compound, which is beneficial to the uniform mixing. It is a solid substance which can adsorb some of its components effectively from gas or liquid. It has large specific surface area, suitable pore structure and surface structure, strong adsorption capacity for adsorbate, generally does not react with adsorbate and medium, is easy to manufacture and regenerate, and has excellent adsorption and mechanical properties. Adsorbents are generally used in industrial production, so adsorbents can be divided into six categories according to the common industrial use.
1. silica gel, it is mainly used for drying, gas mixture and separation of petroleum components.
2. alumina, it is also a dehydrating adsorbent.
3. activated carbon is mainly used for water treatment, decolorization and gas treatment.
4. polyacrylamide is mainly used for domestic sewage and organic wastewater.
5. zeolite molecular sieve for gas adsorption separation, gas and liquid drying;
6. carbon molecular sieves mainly act as transport channels, while micropores play the role of molecular sieves.
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