1. For the drought-affected rivers and lakes, we must continue to do a good job of "closing rivers and sealing lakes" As the natural water area of ​​rivers and lakes this year has been severely reduced, the fish density has increased. If you start catching at the beginning of July, fishermen will catch fish and they will be able to catch it as if they were fishing in ponds. This practice will seriously damage the fishery resources. In view of the drought this year, it is suggested that all localities should continue to do a good job of “fishing and sealing lakes†and prohibit fishing in accordance with actual local conditions so as to facilitate the restoration of fishery resources. 2. After the lakes recharge water, the productivity of the waters will be significantly improved, and the eutrophication of the waters should be prevented. After arid rivers and lakes are recharged, in addition to the input of large amounts of nutrient salts from surface runoff, the sediment of rivers and lakes is exposed to sunlight and the mineralization is greatly enhanced. After the impoundment, a large amount of nutrients will be released from the sediment. In the class, the amount of plankton in the water will increase significantly; a large amount of terrestrial grasses will accumulate in the bottom of lakes and shoals, and the water will quickly rot after submergence, forming a decayed food chain. Therefore, after the water is refilled, the productivity of the water area will increase significantly. Without timely bioremediation measures, water bodies will increase eutrophication. To this end, we must make full use of the characteristics of increased productivity in post-accumulation waters, increase the release of fish, and use bioremediation technology to control the water environment and prevent eutrophication. 3. The natural water bodies affected by this winter, spring, and spring must increase the release of fishery resources and restore fishery resources. Drought this year has caused a serious impact on fishery resources. Therefore, it is recommended that the natural water bodies affected by disasters should increase the release of fishery resources. The Yangtze River is the most important germplasm resource pool of freshwater fishes in China. Germplasm should not be mixed. Therefore, when releasing, it is necessary to insist on the stocking of indigenous fishes, and it is forbidden to use hybrids, artificially-selected varieties, and exotic species (including species from out-of-water basins) as artificial excrement objects. For example, squid must be stocked with wild squid in the area, and some triploid squid (such as oysters, etc.) must not be used as let-through fish. Fishery personnel must strengthen technical guidance and supervision. 4. Promote bioremediation technology with "fish water purification, fishery and water conservation" "To fish water purification" - natural water bodies should be used to stock filter-feeding fish (fish and clams), food-fattening food-chain fishes (measuring slugs, slugs), and omnivorous fish (flies, eels, etc.). Small carnivorous fish (stingrays, pond catfish, etc.) and shellfish (spiral puffer, river fleas, etc.) are used to purify water and prevent eutrophication. "Take water and fish" - develop ecological fisheries and protect the water environment. In natural water bodies, we must prohibit the feeding of herbivorous fish, implement the combination of aquatic animal breeding and aquatic plant cultivation, promote the ecological fishery technology centered on “grass cultivation, snail snails, mixing, thinning, and water control†and protect and cultivate aquatic plants ( Especially for submerged plants, zero pollution and zero emissions are required to maintain the ecological balance of the water environment. 5. The pond should be dissolved in oxygen, prevent floating heads, and prevent water quality from deterioration (1) Anti-floating head. It is clear that without rain, ponds have a high appetite for fish cultured and the water quality is more fat. Once it encounters continuous rain or thunderstorms in the evening, it is very prone to floating or even flooding. Therefore, it is necessary to use aerators and micropore aerated oxygenation techniques in time. To use aerators rationally, we should “start at noon on sunny days, open in the early morning on cloudy days, open in the middle of a rainy night, open in the evening, open the floating head early, and keep open every day during the main growing season for fish†to control water quality. (2) For the crab ponds with a grass cover rate of more than 70%, aquatic grass enclosures should be prevented. Once the weather deteriorates, ponds with too many plants can easily deteriorate water quality. Therefore, it is necessary to remove a part of aquatic plants and keep the coverage of crabs and ponds at around 60% to ensure that crabs are safe in summer. Floor-Stand Atm,Payment Atm Kiosk,Self-Service Atm Terminal,Lcd/Led Monitor Advertising Kiosk Shenzhen Sunson Tech Co., Ltd , https://www.sunsonkiosk.com