Winter winter pond management is mainly in the following aspects: One, the morning and evening tour ponds, found that sick fish should be picked up in time; Second, to maintain a high water level, the water depth should be above 1.8m; Third, the water quality should have a certain amount of fertilizer, transparency to maintain 30-40cm, manure 150kg / acre every 10-15 days, or 1.5kg of carbon ammonia per acre plus 1.5kg of calcium phosphate; 4. Inject fresh water once every 10-15 days, each time filling 10cm. Mushrooms Xi'an complex bio-tech CO.,LTD. , https://www.complexpowder.com