Cockroach is a type of migratory fish that grows in rivers, lakes, ponds and other freshwater areas. After 2 to 3 years of growth, when the body is as long as 50 cm to 60 cm, the gonads begin to mature and migrate to the deep sea for spawning. By the end of the year or the beginning of the year, the seedlings will be clustered in coastal estuaries such as Guangdong, Fujian and Zhejiang. At this time, you can use the lamp at night to grab and catch the seedlings with a hand-made net, a net, and a net. The rearing pond can be made of cement, brick, stone, etc. and is divided into 4 levels. The first-class pool is Baizi pool. The area of ​​each pool is from 100m2 to 120m2, and the water depth is 60cm to 80cm. The second-level pool is the black bedding pool, each pool is from 300m2 to 600m2, and the water depth is about 1m. The tertiary pool is a standard coarse pool, each pool of 1000 square meters to 1200 square meters, with a water depth of 1.5 meters or more; a four-level pool is a foster pool, each pool is more than 1,500 square meters and the water depth is 2 meters. The bottom of each pool should be covered with 10 cm thick sand, and be equipped with organic electric drainage and aeration facilities. The area ratio of the four pools is 1:5:10:15. The first grade pool is stocked with white seedlings (6500 to 7,000 per kg), 1,500 to 2000 tails per square meter, and silkworms, minced meat, and large leeches can be used as bait. The daily dosage is 10% of the pond weight. %about. The bait should be placed on a bait station, and a plastic board should be used above the bench to make the light in the desk dark. In the early feeding period, feeding should be done in the evening, supplemented by low-light lure, so that the seedlings can develop good habits of timing, fixed-point, and quantitative eating. After 2 months, the seedlings became darker in size, called black seedlings, and the tail weight increased from 0.08 to 0.5 g, which was then put into a secondary tank, stocking about 1,000 fishes per square meter, and mainly fed with artificial compound feed. . Formulated with high-quality fishmeal 50% and 20% Alfa starch made from potatoes, 5% leavened white powder, 5% compound auxin, and 30% soybean meal, plus a small amount of wolfberry powder as an attractant. Before feeding, add 50 kg of feed powder and 60 kg of water to the mixer. Stir in the mixer for 2 minutes to make the feed sticky and flexible. Place it on the feed table. Every day, two feedings are conducted on a daily basis, and the daily feeding amount is about 15% of the weight of the pond. After 4 months to 5 months, the seedlings weighing more than 5 grams, can be placed in the three standard pool crude, stocking more than 2000 per square meter, feeding method with the former. After another 4 months, when the seedlings grow to more than 20 grams, they can be reared in a four-level pond and stocked with 10,000 to 12,000 acre per acre. The daily feeding amount is 20% of the pond pond weight. Oxygen requires more oxygen, and the amount of dissolved oxygen per litre is more than 5 mg/l, which is 1 times higher than that of pond fish. If the dissolved oxygen level is less than 3 mg, the carp suffers from poor appetite and slow growth. Therefore, we must carefully manage the water quality. The water should be kept green and the transparency should be more than 30 cm. If the water color is brownish green or dark blue, it means that the fat is too large. Change the water immediately by 1/3. Dianchi should be equipped with a 1 kW to 3 kW impeller type aerator. Every day from 2 to 7 o'clock in the morning, oxygen should be turned on; if the weather is hot or thunderstorms occur, oxygen should be turned on to prevent the death of the floating head. The standard crude pool and the Chengchi pond should preferably be mixed with a small amount of oysters, oysters and oysters to keep the pool water fresh. (Ni Shijun)
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