New Technology of North-to-North-shift Fish Breeding

Since 2000, Xingtai County has carried out research on the cultivation of fingerlings from the "southward migration to the southward" and obtained technical support from Nanjing Agricultural University. The project is to improve the utilization rate of Putian by means of transformation, scientific restocking and management of Putian, so as to achieve a double harvest of carp. The project implemented 133.3 hectares of water in Xingtai County and was approved by Hebei Provincial Fisheries Bureau. The technical highlights are described below. 1 It is appropriate to use 0.2-0.33 hectares of land for the transformation of Putian, square or rectangular, dig 0.4-0.5m, and use 3 tons of quicklime per 1/15 hectares, spread evenly after ripening, leveling and replenishing the bottom of the pool. Cement prefabricated panels are used for building and wiping joints. After the success of the seepage test, the loam is backfilled into the pond. The depth of backfilling is 30-40 cm, requiring fertile soil and uniform thickness. Reserve fish ditch and fish slips account for 10% to 15% of the area of ​​Dianchi Lake. Fish ditch and fish slip are the main places for nesting and living of nesting fish species, and they are also places for summer heat in summer season. The fish ditch is to be excavated around Putian and in the fields, with a width of 1m and a depth of 0.4-0.5m. The excavation of the fish should be connected with the fish ditch, and the depth should be 0.5-0.8m. 2 The cultivation of lotus root 2.1 The identification and selection of lotus seeds The cultivation time of lotus root is generally before and after the rain, and the temperature is stable above 15°C. Select axillary buds and fibrous roots intact, without injury, disease-free, smooth skin, robust, full-bodied, full-bodied section, straight body, complete thick germ is better. 2.2 The disinfection and agglutination of seed pods tend to carry some pathogens. If they are cultivated directly, they are susceptible to disease during the growth process. Therefore, they must be sterilized before cultivation. The method is: using 50% carbendazim or thiophanate-methyl 800 times plus 75% chlorothalonil wettable powder 800 times liquid, spraying the seed pods with a plastic film, seal stuffy species 24h, air dry . In order to extend the growth period of pupa and increase yield, germination should be carried out before cultivation. The method is: about 20 days before the frost break, that is, germination in late March, put the earthworms in a warm room, plant seedlings up and down grass 10cm, sprinkle water 1 or 2 times a day depending on the weather, keep moist, and keep the room temperature at the same time 20～25°C, when the axillary buds grow to about 10cm, they can be cultivated. 2.3 Planting Methods When planting, in order to improve the ground temperature and facilitate the operation, the field water should not be too deep, and can be maintained at 3 to 5 cm. Dig a shallow shallow ditch according to the size and shape of the species, turn the species head down, lean into the mud, and poke the head into the soil from 0 to 12cm, and then gently expose the ground to make the inclination of the plutonium to the ground approximately 20. 3 Stocking of fish species When the water temperature is stable at 22 to 25°C, they can be stocked. About 12,000 hectares of summer flowers are stored on 1/15 hectare, and fish species are soaked with 2% to 3% saline for 10 minutes before stocking. There are two types of stocking fish: 70% grass carp, 15% carp, 10% carp, 5% carp, 70% carp, 15% carp, 10% carp, and 5% carp. 4 Feeding management can be directly fed with artificial diets. The crude protein content is about 35%. The daily feeding amount can be flexibly controlled according to the water temperature, water quality, weather, and fish feeding conditions. The general requirements for feeding and attention points are as follows: "Four Ding" and "Four-seeing" requirements. When the main grass-raising fishes are fed with appropriate amount of leaves, it is advisable not to leave it on the next morning. 5 Day-to-day management During the initial stage of lotus root cultivation, the surface water depth can be maintained at 3 to 5cm. After the floating leaves appear, the water level should rise to 8 to 10cm. When 2 to 3 leaves, the water level should be increased to 15cm or more, and then rise with temperature. High, and then gradually deepen the water level, the maximum depth of field water level up to 20 ~ 25cm, after the emergence of the Festival, is about to enter the pod stage, in order to promote the crust can gradually reduce the water level to 10 ~ 20cm. Adhere to the morning and evening patrol ponds, and timely check the fish's food and activities, to avoid the lack of oxygen floating head, found that the fish disease timely remedy. 6 Precautions 6.1 Prevention of Insect Pests After 2 or 3 vertical leaves are grown, it is necessary to prevent aphids, which may affect the growth of earthworms. 6.2 Regulate the water level In summer, the temperature rises. Attention should be paid to adjusting the water level. New water should be filled every 3 to 5 days. During the flood season, pool water should be prevented from overflowing.

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