Yandu County adopts straw and fertilizer technology to breed catfish. After 2 to 3 months of stocking, the tail fish weight of the carp is 0.5 to 5 kilograms, and 750 to 1,000 kilograms of catfish are produced per mu. The economic benefits are significant. The technology is introduced as follows:
First, choose suitable fields?
Choose land and aquaculture with convenient irrigation, plenty of sunlight, and fertile soil. The sandy soil is better for the soil quality, and the culture area can be determined according to the needs. Generally, 3 to 5 mu is appropriate. In the field, we must excavate outer ring grooves 0.5 to 5 meters wide and 0 to 8 meters deep, and excavate a 0 to 5 meter wide and 0 to 6 meter deep trench at every 2.5 meters on the surface of the earth. . The trenches were opened into "tian", "king", and "well" shapes, and were reinforced with excavated earth to increase the height of the field ridges, which were 0 to 6 meters high and 0 to 5 meters wide. Set up the drainage system on each side of the cultivated field block, and install a dense fence and dense barbed wire to block the squid device at the injection and drainage outlets. ?
Second, disinfection and fertilization?
Before the carp enters the pond for 6 to 8 days, 50 to 75 kg of lime per acre is used to disinfect the whole pool of water. Before the squid enters the pond for 4 to 5 days, 150-200 kg of fertilized water that has been treated with high-temperature straw is sprayed per acre, or 300-400 kg of mechanically comminuted straw is put into the water for fertilization. Water quality provides a rich biological feed for salmon. ?
Third, squid feed?
In mid-August, 3 000 to 4 000 catfishes with a size of 10 cm or more were placed per acre, and 2 500 to 4 000 catfishes with 3 to 5 cm in length could be directly fed. However, the carp seedlings must be fully invested and their size is basically the same, so as to avoid eating too much. Before the squid enters the pool, the fish should be washed with 3% to 4% saline for 3 to 5 minutes. ?
Fourth, feeding and management?
1? Feeding method of bait After 15 to 20 days after the catfish enters the pool, due to the small size of the fish, and after being pulled or transported, the constitution is weak, and some good-quality animal bait should be fed to facilitate the restoration of constitution as soon as possible. Promote its rapid growth. Afterwards, the planktonic microorganisms cultivated with compound feeds, animal feeds and straw fertilizers were gradually replaced. 5 to 8 feed stations per acre of pond water can be set, and the daily feeding amount of concentrate feed accounts for 5% to 8%, and the other is coarse material. Each shot is fed 1 time in the morning, middle and evening, and it is eaten 1 hour after feeding. It is advisable to finish it. ? 2? Bait source (1) straw fertilizer baits. To give full use of straw base fertilizer, supplemented with high-temperature decomposition of straw as a top-dressing fertilizer, straw ammonia fertilizer can also be used as topdressing, generally 50 ~ 100 kg of top dressing dosage, the specific amount should be depending on the eel feeding, weather changes and other flexible control. (2) Animal and vegetable feed sources. All kinds of animal carcasses, scraps and fly maggots, cocoons, cockles, shellfish and corn flour, wheat flour, bran, cake meal, etc. can be used as bait for farmed carp. (3) Preparation of feed pellets. The condition can also be formulated according to the nutritional needs of sea bream as a pellet feed containing more than 30% of crude protein. The reference formula is: corn flour 20%, wheat flour 15%, fried soybean powder 10%, vegetable cake powder 15%, rice bran 20%, silkworm powder 12%, fishmeal 8%. ?
3? Water quality management Catfish is a subtropical omnivorous fish, like water, resistant to hypoxia, strong ability to adapt to the environment. As the straw is soaked in water, it will increase the content of silicon in the water, and silicon can promote the proliferation of diatoms. The diatom is a good natural bait for salmon, so the salmon grow faster in straw fertilizer. In order to maintain good water quality, the high temperature season generally changes the water every 15 to 20 days 1 time, each time to replace 1/5 to 1/3 of the pool water, and later use straw and other fertilizers to cultivate water, and continue to cross-cycle use. ?
4? Note that the anti-escape squid can "crawling" along the river, so when there is heavy rain or heavy rain, special care must be taken to prevent the squid from escaping. It is necessary to maintain a certain level of aquaculture in peacetime and to constantly check whether there are loopholes in the pool and the integrity of the fish stopping facilities. ?
5. Prevention of Diseases To prevent enteritis and black body disease in squid, water bodies should be disinfected once every 7 to 10 days before June, and every 10 to 15 days after June. Each time, mu bleaching agent should be used. ~ 1 kg or quicklime 12 to 5 to 15 kg.
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