After spring and summer feeding, fertilization and fish growth, the amount of fish contained in the pond increases, the water space is small, and the accumulation and concentration of organic substances such as a large number of water remnants and excretions are already large, and they consume a lot of oxygen. Hydrogen sulfide and other toxic gases will also be produced. The accumulation of ammonia nitrogen will increase and the PH value will drop, which can easily cause floating head pans. Therefore, it is necessary to promptly enter water and change water in a small amount for multiple times to discharge the bottom water as much as possible, pay attention to the cultivation of suitable plankton species, and prevent and reduce the breeding of blue-green algae. Second, use Bacillus, photosynthetic bacteria, nitrifying bacteria, EM bacteria and other microbial preparations to regulate water quality, to prevent nitrite, ammonia nitrogen, hydrogen sulfide, PH value is too high and other factors on the water damage caused; spilled every 15 days 1 Secondary lime can increase the calcium content of the pool water, regulate the PH value, and reduce the harmful substances in the sediment. The dosage is 15 kg/mu per meter water depth; the water PH7.0-8.5 is maintained, the transparency is about 25 cm, and the water color is green and dark brown.
Second, reasonable feeding and supplement fertilizer
With high-quality feeds, daily feeds accounted for 3%-5% of pond fish weight. If it is a conventional fish or a large proportion of its cockroaches and cod fishes, pay attention to the release of fertilizers. It must be done in small quantities several times to prevent the water from being too fat and less transparent. You can feed appropriate amounts of green fodder for grass-and-fish consumption. If it is other famous economic varieties, generally do not apply fertilizer.
Third, strengthen disease prevention and treatment
Judging from the experience and practice of pond fish farming, fish diseases will enter another popular peak after the beginning of autumn. Therefore, to master the law of the incidence of fish in the fall, and take active prevention and treatment measures of “prevention without disease, early treatment with diseaseâ€, can we get a multiplier effect. It is recommended to adopt a combination of "elimination" and "internal treatment" to prevent the occurrence of diseases. Every 20 days or so, the whole chlorine preparation is sprinkled once and once a month. For ponds with poor water quality and reduced aquatic weeds, the method of “killing first and then killing insects†is adopted.
Fourth, strengthen the patrol pond
Every day, stick to the morning and evening patrol ponds, check the fish activities and eating conditions, check the water color, transparency, and PH value, and immediately remove the rot grass and bait, and disinfect and clean the food field. Stay at night to visit the pond to strengthen inspections.
Fifth, timely fishing listed
In autumn ponds, the amount of fish carried increases, and many commercial fish have already reached the market specifications. They should be properly harvested and marketed to reduce the density of fish in ponds; the bottom mud will cause a decrease in the harmfulness of fish due to fishing. Better growth space and environment. If it is a seedling, it should also be divided into winter and winter at the appropriate specifications and varieties to prepare for the coming spring.
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