Lake nets to cultivate first-year grass fingerlings
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Second, the fence setting. Use a bamboo scaffold with a length of 3 meters as a support, plant a 20-35cm deep, spaced 2 to 3 meters apart, and use a polyethylene dense mesh as a mesh net mesh, mesh 30 to 40 mesh, and a mesh height of 2.5 meters. In the highest water level, when the net is higher than the water surface 20~30cm, the net skeleton is made of pebbles for sinking, about 30cm into the mud, and usually 50cm on the surface, the net surrounding area is suitable for the water situation, and 10~50 mu is appropriate. . In order to prevent wind and waves from attacking, bamboo rafts should be fully fixed or be supported by pillars on the other side.
Third, before and after the release of fish species technical measures.
1. 15 days before summer flowering, fully remove the wild, remove weeds, use electricity to remove wild fish, then use the summer fish nets to pull the net several times to remove as many wild fish as possible.
2. In the 10 days before the fish enters the water, multiply the duckweed in the fence, and put in 25 kg of duckweed per acre. From the beginning of the shallow water area or the inner corner of the net, gradually expand the area of ​​the duckweed and prepare sufficient water for the summer flowers. Pacifying food.
3. The fish species were bleached 1 to 2 days before bleaching and 90% crystal trichlorfon was sprayed on the edges of the mesh at a concentration of 1.25 ppm 1 or 2 times to disinfect the body of water and the mesh.
4. The summer fish should be selected for sunny and windless weather. The water temperature should be around 20°C. The running time should be carried out in the morning or at 9.00 a.m. The temperature difference between the temperature of the transported fish and the temperature of the lake should be less than 2°C. Otherwise, the water should be added slowly and the temperature difference should be reduced. The fish species must be disinfected with 2% salt water for 5 minutes before being released.
5. The summer flowering specifications should be larger, the specification is 6~7cm, 3000 mu is put, and about 20% of the fish species should be taken into account.
Fourth, feeding and management.
1. Feeding: Set up a fine and green feed table. According to the area and length of the fence, use a bamboo frame to fix a green material table every 100 meters, one for every 10 acres, and 1 to 2 for each 10 acres of fine material. The fish species began to ingest food 1 to 5 days after entering the water. The concentrates were mainly rice bran, wheat bran and cakes, and they could be fed with granular foods (can be domesticated and baited), and the amount fed was based on the weight of summer flowers. %, green material is mainly duckweed, depending on the circumstances, as appropriate feeding. In the middle and late stages of growth, feed 2 times a day: At 9:00 am, use green cast as the main ingredient, such as tender grass and aquatic plants. After 4 o'clock in the afternoon, wait until the green material is eaten before casting again. However, it will take 2 hours to finish.
2. Disease prevention: 7 to 10 days after entering the water, the summer flowers are splashed with bleach or bromochloroheine around the net and the food field. Moss can be splashed along the edge of the mesh with a solution of copper sulfate. Lime water once, or spilled with bleach, chloral chloride, etc. From July to August, the bait can be fed by adding garlic, salt, etc. to the concentrate to prevent diseases.
3. According to the growth of fish, timely control the area of ​​aquatic plants, pay attention to the rise and fall of the water level of the lake to prevent the fish to escape from fish due to the high water level. Prepare a chemical oxygen booster or aerator to increase oxygen in time with low pressure, no wind and oxygen deficiency.
4. In time to salvage dead fish, residual bait, leftover grass, sundries, etc., regularly check the nets, prevent fish from escaping, wash the nets frequently, and run smoothly.
Fifth, from the fishing species. At the end of October, the water level of the lake dropped, and it could be divided and arrested by slicing nets or concentrated lure.