Wild fish is an unfavorable factor in the production of fish. It can reproduce naturally in large amounts in ponds, resulting in increased oxygen consumption in ponds. It competes with domestic fish for bait, and its economic value is extremely low, which affects the yield and economic efficiency of fish farming in ponds. The improvement. To do this, it must be cleared. Common methods are:
First, drug clearance work in conjunction with the clear pond, with lime, bleach or new drugs "strong chlorine" clear pond. Routine doses can not only clean water, but also kill pathogens such as wild fish, snails, aquatic insects, and bacteria and parasites, which are beneficial to stocking stocks.
Second, water filtration Water filter is more important for effective control of wild fish, especially the fry, fish ponds. After the clear pond, the wild fish often enters with the water source and competes for catching fish feed, some meat or miscellaneous foods and even residual food fish, causing a certain threat and harm. Therefore, the influent water source is preferably filtered and the filter bag is preferably made of 2 mm polyethylene yarn material. Can control fish, eggs, aquatic insects and so on.
Third, the fishing clearance 1. Feeding cage fishing clear the use of feeding cages, cattle, chickens and other bone or rapeseed cake, fresh shrimp and other food for trapping, the effect is good. 2. Screen fishing clearance If there are more fish on the upper layer and the food is severely eaten, they can use their habit of swimming on the surface of the water and concentrate on fishing around the bait station during feeding. That is, one hour after feeding, the main fish left for food and fished around the bait station to remove a certain amount of fish. 3. The use of exercise fish species or the sale of fish species to remove this work is mainly carried out in the production of fish species, the use of trash fish is more intolerant to the biological characteristics of the hypoxic environment than the fish, after the fish species by the hanging box exercise, if Screening is still difficult to remove, and pond fish can be concentrated in an appropriate amount. If the fish is not resistant to hypoxia, it can be removed. The application of this method to master the tolerance of the fish, to prevent hypoxic damage to fish.
Fourth, the biological removal of fish or more fish into the second-year-old fish ponds, the use of fierce black fish, sweet-scented osmanthus fish, leather moustaches such as the removal of miscellaneous fish, shrimp. However, such ponds must be able to fish in dry ponds and control the number of ferocious fish, which cannot cause new damage. In addition, the polyculture of fierce fish species specifications should be less than 2/3 of the fish, do not exceed 40 per acre, otherwise it will cause a growing imbalance to harm the family fish. The leather beard must be trapped before the water temperature is lower than 12°C to avoid damage caused by winter freezing and death.
First, drug clearance work in conjunction with the clear pond, with lime, bleach or new drugs "strong chlorine" clear pond. Routine doses can not only clean water, but also kill pathogens such as wild fish, snails, aquatic insects, and bacteria and parasites, which are beneficial to stocking stocks.
Second, water filtration Water filter is more important for effective control of wild fish, especially the fry, fish ponds. After the clear pond, the wild fish often enters with the water source and competes for catching fish feed, some meat or miscellaneous foods and even residual food fish, causing a certain threat and harm. Therefore, the influent water source is preferably filtered and the filter bag is preferably made of 2 mm polyethylene yarn material. Can control fish, eggs, aquatic insects and so on.
Third, the fishing clearance 1. Feeding cage fishing clear the use of feeding cages, cattle, chickens and other bone or rapeseed cake, fresh shrimp and other food for trapping, the effect is good. 2. Screen fishing clearance If there are more fish on the upper layer and the food is severely eaten, they can use their habit of swimming on the surface of the water and concentrate on fishing around the bait station during feeding. That is, one hour after feeding, the main fish left for food and fished around the bait station to remove a certain amount of fish. 3. The use of exercise fish species or the sale of fish species to remove this work is mainly carried out in the production of fish species, the use of trash fish is more intolerant to the biological characteristics of the hypoxic environment than the fish, after the fish species by the hanging box exercise, if Screening is still difficult to remove, and pond fish can be concentrated in an appropriate amount. If the fish is not resistant to hypoxia, it can be removed. The application of this method to master the tolerance of the fish, to prevent hypoxic damage to fish.
Fourth, the biological removal of fish or more fish into the second-year-old fish ponds, the use of fierce black fish, sweet-scented osmanthus fish, leather moustaches such as the removal of miscellaneous fish, shrimp. However, such ponds must be able to fish in dry ponds and control the number of ferocious fish, which cannot cause new damage. In addition, the polyculture of fierce fish species specifications should be less than 2/3 of the fish, do not exceed 40 per acre, otherwise it will cause a growing imbalance to harm the family fish. The leather beard must be trapped before the water temperature is lower than 12°C to avoid damage caused by winter freezing and death.
Changhong Imp. & Exp. Co., Ltd. , http://www.ly-foods.com