It is known that fish are prone to oxygen deprivation and die in high temperature seasons, so special precautions are taken at that time, and people often pay insufficient attention to the phenomenon of oxygen deficiency of fish during wintering, which may easily cause accidents and cause losses.
Causes of hypoxia
During the winter, although there are fewer fish activities and poor oxygen consumption, if there is more silt in the bottom of the pool, organic matter decomposes and consumes oxygen, which makes the oxygen low, while neglecting the regulation of water quality; or the lack of illumination after the ice closure, poor photosynthesis. Oxygen production is insufficient, so it is also prone to fish anoxic floating heads and even dead fish accidents. Especially in the late winter, due to winter management can not keep up, water quality is aging, with the increase of water temperature, decomposition of organic matter is intensified, if you do not take timely measures, it is likely that due to lack of oxygen floating head or even cause dead fish accidents.
Precaution
The density of fish ponds that are sparse in density and ponds overwintering, the stocking density of fish species should not be too large, generally 20,000 to 40,000 fish species of 10 cm can be placed on the acre, and the lack of oxygen due to stocking densities should be strictly prevented; and for adult fish ponds, At the beginning of the winter, some of the fish that have reached the listed specifications can be listed and the pond pressure can be reduced.
Improving water quality is the key to management. Improve water quality is mainly to pay attention to adding water, generally 15 days to 20 days should be added once again, each time 10 cm to 20 cm, usually pay attention to observation, found that water quality is not good, timely adjustment measures; winter should pay attention to the late The changes in water quality will require a major change of water once in the spring, changing the water to 1/3 to 1/2 and thoroughly improving the water quality. It is best to constantly measure the dissolved oxygen in the pool water, keep the dissolved oxygen above 5 mg/l, find that the dissolved oxygen is too low, replace the water in time and take other oxygen enhancement measures to avoid accidents.
Timely fertilizer and water during the winter, but also pay close attention to the pool of fat, for the new pond, thin pool, often top manure, the specific amount of fertilizer depends on the pond conditions, the pool of water to control flexibility, according to the principle of a small number of times to maintain the transparency of the pool water 30 cm ~ 35 cm is good, manure should be fully fermented before use to prevent excessive fertilization.
Observe that the observation should be carried out in time for the first aid during the overwintering period. Observe the fish's activities and water quality, find problems, and take timely measures to avoid accidents.
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