First, the management of the end of winter
As the temperature increases after wintering, the fish activity increases and the temperature rises. Overwintering pool water is easily degraded due to the high density of fish and the organic matter content in the water. Therefore, it is better to separate the pools as soon as possible after the early spring and put the overwintering fish to the environment. Normal feeding in density-constrained culture ponds is the most fundamental measure for reducing dead fish in spring. However, the following precautions must also be taken.
(I) Prevention of Bubble Disease in Spring
Especially in the late winter, especially after the beginning of spring, the amount of phytoplankton in the pool water often reaches the peak, the transparency of the pool water is reduced to 10-20cm, and the dissolved oxygen often reaches supersaturation (20mg/L), which makes it easy for the fish to get bubble disease. Take the following measures to prevent: 1 filling with water; 2 agitate the water and aerate it, increase the use time of the aerator on the eve of natural thawing, and allow the ice to melt in advance for 7-10 days; 3 use the salt per acre when the fish suffers from bubble disease 5- 10kg splash treatment.
(B) Anti-wind, cold weather
When the thawing occurs in the spring, there is sometimes a climate similar to that in the winter when the ice is sealed off, so when deep winds are encountered, deep well water must be filled.
(3) Staying in the water for the winter to promote early pooling
Some rivers and irrigated areas have a time lag between agricultural water use and aquaculture pond waterflood. Generally, they will wait until mid-to-late May. They can use the water in the first year of the fall to collect water for the winter, that is, when the animals are caught during the autumn, they will drain the water from one pool first. After the net fish, every second pool of water is discharged into the first pool. The following analogy is very simple (reserve the pool to prevent water leakage). Over the winter, the pond water freezes in winter, and in the early spring and the wintering pond simultaneously, the breeding pond can be used to bleach the water to clear the pond, and the fish can be put in a few days. Normally, the stocking will be completed before April 25, and it will enter normal management, so that it will be possible to feed nearly one month earlier.
(4) For the fish ponds where water shortage cannot be divided in time, the following management work must be done after the development:
1, timely removal of dead fish and debris floating in the water.
2. Use 35 kg of lime to adjust the water quality in the whole area of ​​the Mu, precipitate organic matters, and reduce your turbidity.
3, a few days later with bleach to make the pool water 1.0ppm concentration, Quanchiposa, kill pathogens.
4. Properly feed the feed with higher protein content.
5. Clear the fish pond as soon as possible and divide the pool in time.
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