Water quality is a key factor affecting the survival rate of overwintering fish species. Good management of water quality should focus on pH and dissolved oxygen. pH value pH is an indicator of the pH of a water body. The body of fish in the wintering pond requires a pH of between 7 and 8, and high or low levels have a direct hazard to the fish. Practice has shown that where the management is not good, the pH value of the wintering fish ponds is generally low. In this regard, the following two management measures can be taken: In the daily management and monitoring of hanging lime bags, if the pH value is found to have decreased rapidly and even reached a certain degree of acidity, lime bags can be hung in the water to increase the pH. The bag is sewn with polyethylene gauze, and about 1 kilogram of lime is contained in the bag. A number of ropes are suspended in the water. About 5 kilograms of lime are used per acre, depending on the degree of partial acidity of the water. The alkaline bag is also attached to the bag by a rope hanging method, so that the acid water can be converted into neutral or slightly alkaline in a short period of time, and the surface alkali is 0.2 g per cubic meter of water. Dissolved oxygen According to practice, dissolved oxygen in fish ponds should be maintained at more than 3 milligrams per liter, and less than 3 milligrams per liter must be supplemented with oxygen. There are five main methods: Oxygen injection is the use of uncontaminated rivers, lakes, reservoirs of water into the overwintering pool, this method is simple, effective, suitable for areas with adequate water. Cycle supplemental oxygen In the case of difficult external water source, the original pool water is pumped to carry out on-site circulation, so that the pool water is in full contact with the air, increase dissolved oxygen, release harmful gases. Inflatable oxygen supplements use air compressors or ceramic blowers to pump air into the water, or use jets to pump air or high-oxygen water into the pool. Chemical oxygen supplements use chemical drugs to supplement oxygen. This method is suitable for very small wintering ponds. The drugs used are calcium peroxide, hydrogen peroxide, ammonium persulfate and the like. Generally, 2 kg ~ 2.5 kg of calcium peroxide per mu, or 500 ml of hydrogen peroxide, or about 5 kg of ammonium hydroxide is used. The organism supplements oxygen and introduces the fertilizer containing more phytoplankton into the pond before winter to make photosynthesis under water and produce oxygen. In the pool where the water is introduced, the ice area is swept away during the icing period to keep the ice transparent and facilitate light penetration. Fire Door Monitoring System,Fire Door Monitoring Interface,Fire Door System Interface,Fire Door Control Interface LIAONING YINGKOU TIANCHENG FIRE PROTECTION EQUIPMENT CO.,LTD , https://www.tcfiretech.com
How to increase the survival rate of winter fish