The growth of green algae and a certain amount of light, open-air fish ponds just provide such conditions, so it will lead to algae outbreaks. If you want to prevent it, you'd better set up a sunshade net, which can reduce the intensity of light, for curbing the growth and reproduction of algae, can play a very good effect.
Green algae will only multiply in large numbers in places where there is excess nutrition in the water body. Generally, open fish ponds will be properly fertilized at the initial stage, but the source of nutrition behind is the bait for feeding. Feeding too much bait, eating too much bait becomes residual bait, eating up becomes fish stool, which will accelerate the growth of algae, so we must reduce feeding.
If you want to prevent algae explosion, the most effective way is to use drugs. Generally more commonly used drug is glutaraldehyde, this drug itself is algaecide, algae outbreak can be used to remove algae, usually can also curb its growth. Usually every 100 liters of water can be dropped into 5 milliliters of 2% glutaraldehyde, which can be effectively prevented.
Generally, fish ponds cannot be mixed with some algae-eating fish, but black shell shrimp can be raised. This kind of shrimp is very easy to raise, and the requirements for water quality and temperature are relatively low, but it may be attacked by fish when changing the shell. In addition, it will eat fish eggs, so the breeding period must not be raised.
