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2. The species of fish, grass, and fish must be of uniform specifications, and the physique is robust. The specifications are about 100 grams/tail, and the specifications of other species, especially the species of squid, must not be greater than that of grass carp.
3, species mix and stocking density The main pond to raise grass carp, grass carp should be put in about 60% of the total amount, a better condition of the pond, per acre can be put grass carp 500 to 550, with 300 squid, é³™There are 70 fishes and 80 squids (or 150 to 200 squid), but they can also be used with the head lice.
4. The feed is mainly fed with green grass or various aquatic plants. In addition to regular feeding of alfalfa grass, reedgrass, bitter grass, alfalfa grass, artificially cultivated alfalfa, Sudan grass, ryegrass and other high-quality and high-yielding green fodder can also be fed. In addition weeds and vegetables, beans, melons, corn stems and leaves are all good feed for grass carp. The amount of feed to be fed should be based on the weather, fish eating conditions, and water quality. It is better to eat before the evening of the day. During the summer heat season, grass grasses should be strictly prohibited from eating night grass. In addition, at about 4 pm every day, fish should be fed with 1.5% of the weight of pond fish to supplement nutrients and domesticate for centralized feeding. The use of grass-fed puffed pelleted bait in combination with green fodder works well. This bait can not only meet the needs of grass carp growth, but also save a lot of labor. It is also very good for purifying water and preventing fish disease.
5. Water quality It is very important to regulate the quality of the grass carp. It is important to keep the water fresh and sanitary. It is required to add 5 to 10 cm of fresh water every 3 to 5 days in order to increase the vitality of the water, increase dissolved oxygen, increase the reproduction rate of plankton, meet the needs of eels and catfish for bait, and stimulate the rapid growth of grass carp. Equipped with aerator oxygen, to keep the water fresh, dissolved oxygen is normal. At the same time, lime is splashed with 10 to 20 kg of lime every half a month to clarify the water quality. The transparency is best kept at 25-30 cm.
6, to prevent fish diseases Bacterial enteritis, gill disease, red skin disease is the grass carp's three major diseases. Viral hemorrhagic disease has also appeared in some areas in recent years. In actual production, these diseases are all concomitant diseases. Therefore, a comprehensive prevention and control method should be adopted for prevention. 1 Thoroughly clearing the pond, the pond that owns the grass carp must thoroughly clear the pond before stocking, eliminating pathogens and predators. It is best to use dry lime to spread the clear pond and use 75 kg per mu. (2) Disinfection of fingerlings. Fish must be disinfected before stocking, and 3 to 4% salt solution can be used to soak fish seeds for 15 minutes. Other disinfection methods such as 10 ml/kg bleaching powder and 8 mg/kg copper sulfate can also be used. 3 feed disinfection, green feed is best to use 5 ~ 10 ml / kg of bleach solution and then fed. 4Disinfection in the food court. From June to September, the food field is sterilized once every two weeks. After the fish have eaten, 500 grams of bleaching powder is used to dissolve the water, and they are splashed around the food field. It is also possible to use bags or hanging bottles. Method of disinfection, 5 restrictions on appetite, grass carp greedy, as long as the environment is appropriate, the appetite is basically unrestrained, especially in the hot season to limit the feed intake of grass carp, generally fed to Bacheng full, but can not let grass carp eat nocturnal grass, every day will insist The remaining residue is removed. 6 pool water disinfection, feeding baits, 5 to September, pool water once every half of the poisoning. Commonly used drugs and their dosage: bleaching powder 1 mg/kg, copper sulphate, ferrous sulfate mixture 0.70 mg/kg, trichlorfon 0.50 mg/kg, quicklime 20 mg/kg, all kinds of drugs used alternately, the effect is better. The bait can be fed once every half month, each time for 3 days, 100 grams of oxytetracycline per 100 kg of feed, or drugs such as sulfonamides, furans, etc. can be used to make the bait and be fed as appropriate.
1. The pond's main pond for raising grass carp is no more than 20 centimeters thick. The water source is sufficient and the water quality is good. The pond's water depth is maintained at more than 2 meters. The pond of about 1 mu should be equipped with 2.2 kilowatts of aerators.