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1 Selection of Water Areas Select coves to be placed near the villages, sunny leewards and water depths of more than 8m. This will not only facilitate management, but also avoid the occurrence of dry season cages (the normal elevation of the reservoir area is 3m). Or choose a water area that is within 0.1m/sec away from the fairways, docks and water. Such a water environment is relatively quiet and can reduce the stress response of fish.
Water resources of pollution sources such as chemical fertilizer plants, pesticide plants and paper mills in the upstream and surrounding areas should not be selected.
2 Making of cages
2.1 Net cage material uses 33 polyethylene nets.
2.2 The cage specifications are hexahedral closed double cages with lids. The cage is 3m long, 3m wide and 3m deep; the outer mesh is 3cm, and the inner mesh is 1.5cm.
2.3 cage brackets from the four 3.5m, tail diameter of about 4cm made of bamboo and bamboo 3m3m square float rack.
3 cage installation
3.1 The anchorage of the cage is fixed by anchor rope. Each group of 10 boxes is a group, each group is ligated in series along the two sides of the cage by two polyethylene-based cords with a diameter of 2 cm. Box spacing 1m, row spacing 5m. Each row of 2 ends is tensioned and fixed by anchor ropes. Each anchor weighs 10kg. Anchor rope diameter 3cm, length greater than water depth 2.5 times.
3.2 Net cage water time Net cages should be installed 10-15 days before the fish species are put into the tank. After the algae are attached to the tank wall, friction damage to the fish body can be prevented to improve the survival rate of the fish species.
3.3 Production of feedstuffs The frame was made of 6mm diameter steel bars, and 40 mesh screens were lining and seaming to make 1.5m x 1.5m rectangular feed tables with a height of 0.2m. Feeding platform hanging in the center of the cage, close to the bottom of the box.
4 stocking of fish species
4.1 The capture of the fish species is adopted by shrimp giants and fixed nets. When the small screen is caught, use a small scissors to cut the cable and take the fish. Do not pull the hard pick by hand. Electro-fishing species are not available.
4.2 Selection of species There are four types of yellow turdice in the outlet area, namely P.fu-lvidraco, P.nitidus, P. vachelli, and yellow croaker. (P. virgatus). Among them, the stingray grows quickly and has large individuals, and it has the most breeding value. In acquisition and acquisition, the above four types are often mixed together and care should be taken to identify the selection. Stingray main features: dark brown body, large mouth, short and round kiss, pectoral fin spine internal and external edges are serrated, the other three species grayish yellow, mouth, small, more pointed kiss, pectoral fins hard outer edge smooth The inner edge is serrated.
4.3 Stocking density Fish species tailstock weight 25g stocking density 100 tails/m2, tail weight 50g stocking 70 tails/m2.
4.4 When fish species are sterilized, the fish box is bathed with 3% to 5% saline solution for 5 to 10 minutes.
5 Feeding methods Baits are mainly fresh fish, supplemented with quail, pork blood, and snail meat. The bait fish mainly comes from the capture and acquisition of wild fish in the reservoir area. Fish species can be fed after the box. In the early stage, the sturgeon, which was eaten like stingray, was twisted into a fish larvae for attracting and domesticating. After 1 week, the bait fish can be directly fed into small, palatable fish. The daily feeding amount is controlled at 2% to l0% of the fish body weight, depending on the weather, water temperature, and fish activity conditions. Feeding twice a day, from 6:00 to 8:00 in the morning and from 5:00 to 7:00 in the evening. According to the evening feeding habits of stingrays, the amount of feeding in the evening should account for 60% of the daily feeding amount. It is advisable to eat within 2 hours each time.
6 daily management
6.1 Wash the cage every 1 to 7 days and wash it once to remove debris such as garbage in time to prevent the plugging of the mesh from affecting the water exchange.
6.2 Cleaning the feed table Check and clean the feed table every morning to prevent the leftover bait from decaying and damaging the water. At the same time, depending on the situation of the remaining bait, the amount of feeding on the day is determined
6.3 Preventing Fighting Fish Every day should carefully observe and inspect the nets for damage and slippage. If it should be repaired in time.
6.4 Cover Shady Stingray prefers to feed under low light. Portions of water lettuce can be transplanted inside the box, and its coverage area should be less than 50% of the total area of ​​the cage. It is also possible to cover the lid with a black plastic woven cloth.
7 Diseases Prevention and control of yellow catfish disease is less, but once the disease losses are greater. The process of cage culture should be based on prevention.
7.1 Feeding table bag Disinfection use woven sachets, each bag containing 150-250g of bleaching powder, hung above the feed table, medicine bag into the water 50cm, each box hanging a bag, after the drug is dissolved, interval 3 to 5 days and then add.
7.2 Sprinkle quick lime regularly Every 7 to 10 days, 1 to 1.5 kg of quick lime per container is poured into the water and splashed, once a day for 3 consecutive days.
Stingrays are scaleless fish and are more sensitive to drugs. Trichlorfon and copper sulfate should be used with caution.
Pseudobagrus fulvidraco Richardson (Pseudobagrus fulvidraco Richardson) is a 鲶-shaped head, family, yellow pecker, commonly known as yellow, yellow. For small benthic fish, hi clusters live in waters with slow water flow and many aquatic plants. During the day, it rests on the bottom or hidden in caves. It is active at night, feeds, and ingests aquatic insects and their larvae, molluscs, and small fish. General body length 120mm, weight 30-100g, maximum individual 300mm, weight 500-750g. Because of its delicate meat, delicious taste, rich nutrition, less muscle interspersed and popular with consumers, is one of the most valuable fish in China. The market price is above 40 yuan/kg. After the completion of Fujian Shuikou Power Station, the rivers of the Lancang River will become wider, the water flow will be slower, the water quality will become fat, and small wild fish and shrimp will increase, which is very beneficial to the long-term growth of the yellow catfish. People in the reservoir area will collect and purchase wild seed for cage culture, net cages of 3m3m3m, and stocking 600-1000 tails per box of fish weighing 25-50 g. After rearing for more than 6 months, the tail weight can be increased to 200. ~ 400g, the yield of up to 10 ~ 20kg/m2, significant economic benefits. The main breeding techniques are introduced below.