The bioaerobic method injects fertilizer-rich phytoplankton into the fish pond before freezing, and the amount of water injected does not exceed one fifth of the total pool water. Phytoplankton is used for photosynthesis to release oxygen to oxygenate the pool water. If the pool water is thin, apply 0.5 to 1 kg of urea and superphosphate per acre. Do not apply organic fertilizer. Fertilization time should not be too early, it is best to be carried out immediately before freezing, in order to avoid premature breeding of algae, reducing the oxygen content of later water.
The aeration and aeration method uses an air pump to press air into a hose installed under the ice water. A sand filter is attached to the top of the hose, or many small holes are directly pierced on the hose, so that the air is diffused into the water with small bubbles, and the air is increased. The contact area with water increases the oxygen content of the pool water. If necessary, oxygen cylinders can be used to directly send pure oxygen through the hose to the ice water for emergency oxygen supplementation.
Chemical aeration methods Small water bodies, such as pools and tanks, in greenhouses can be supplemented with oxygenated chemical aids during hypoxia during winter. Suitable chemical oxygen activators include ammonium dipersulfate, calcium peroxide and hydrogen peroxide. Ammonium peroxodisulfate uses 10 grams per cubic meter of water and is harmless to fish. Calcium peroxide and hydrogen peroxide can add 10 to 20 milliliters per cubic meter of water. The amount should not be too large to avoid harm to the fish.
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