In recent years, due to the decline in the quality of some carp and carp, many fish farmers have turned their attention to grass carp farming. Here are some things to look out for when rearing grass carp. 1. Ponds The grass ponds are no more than 20 centimeters thick, with sufficient water and water quality. The pond water depth is maintained at more than 2 meters. A pond of about 6,670 square meters should be equipped with a 2.2-kilowatt aerator. 2. The species of fish, grass, and fish must be of uniform specifications, and they should be of good health. The specifications are about 100 grams/tail, and the specifications of other species, especially the species of carp, must not be greater than grass carp. 3. Species collocation and stocking density The grass pond is the main raising grass carp. The amount of grass carp should be controlled at about 60% of the total amount, and the pond with better conditions can have 500 to 550 grass carp per 667 square meters, with 300 pairs of carp. , 70 squid, 80 squid (or squid 150 to 200), but also 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 yield green feed 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 food and water conditions, and it is better to eat before the evening. In the summer hot season, grass carp should be strictly prevented 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 granule 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. At the same time, it is 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 hygienic. 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 leaching 10-20 kg every 667 m2 to clarify the water quality. The transparency is best kept at 25-30 cm. 6. Prevention of fish diseases Bacterial enteritis, gill rot, and dermatosis are the three major diseases of grass carp. 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 5 kilograms per 667 square meters. 2 fish species disinfection, fish species must be disinfected before stocking, can be used 3% to 4% salt solution dip fish species for 15 minutes, can also be used bleach 10 ml / kg; 8 mg / kg copper sulfate and other disinfection methods. 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 disinfection. 5 Limit appetite, grass carp greedy. As long as the environment, suitable, appetite is basically unrestrained, at high temperatures. In particular, it is necessary to limit the food intake of grass carp during the season. Generally, it is sufficient to feed 80% of the grass carp. Even grass carp cannot eat nocturnal grass. Every day, it is necessary to remove the remaining fish residue. 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.
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