Management techniques of aquaculture in summer

The summer weather is hot, the water temperature is high, the fish growth is exuberant, the water concentration is high, the fish is easy to be infected with disease. In the high temperature season, it is particularly important to strengthen management.

First, adjust the water quality.

1. Add the pool water to the highest level. With evaporation, leakage to timely recharge of new water, generally every 7-10 days water injection, each time 10-15 cm. If the water source is insufficient, the amount of bait and fertilizer should be reduced on the premise of ensuring water color and transparency.

two。 Pond fertilization should be a small number of times, should keep the water color is reddish brown, brown-green, brown-cyan (dark green) and green, and the color of the water should be "alive" (the color changes obviously every day); the transparency should be controlled at 20-30 cm; in the case of very strong water color, bleach or formaldehyde can be used regularly with disease prevention to reduce the biomass of phytoplankton (pay attention to the change of dissolved oxygen). In the case of high close cultivation, the content of nitrogen in water is high, so phosphate fertilizer can be applied mainly, and no or less nitrogen fertilizer can be applied.

3. Adjust the pH of the pool water to keep the pH value between 7.5 and 8.5. Lifetime lime can be applied every 15-20 days. The dosage per mu is 20-25 kg, and the whole pool is sprinkled after turning into lime milk. To improve the water quality, precipitate the organic matter in the water, reduce the oxygen consumption of the organic matter in the pool water, and promote the growth of phytoplankton.

4. Reasonable configuration, the use of aerator, according to the design output of 5-8 mu equipped with an impeller aerator. It can not only regulate water quality, but also increase oxygen to prevent fish from floating head. The use of the aerator should scientifically determine the start-up time and the running time of the machine according to the change law of dissolved oxygen in water and the function of the aerator. It is necessary to adhere to the principle of opening at noon in sunny days, early morning in cloudy days, not in the evening, before floating heads, and in the middle of the night with continuous rain; the operating time should be determined according to the weather, water quality, the floating head of fish and the load area of the aerator.

Second, strengthen the management of baiting

Among them, the amount of bait should be flexibly controlled according to the weather, water quality and fish eating. The water color is good, the water quality is fat and cool, and the bait can be fed normally. If the water color is too strong, the amount of bait should be reduced and new water should be injected in time. When the competition for food of fish is fierce, the bait can be fed normally, the school of floating fish decreases, and when the competition for food is not fierce, the amount of feeding can be reduced, and the cause should be found; when the fish disease is treated, the amount of feeding should be properly controlled.

III. Drug prevention

1. Use bleach once a month to prevent bacterial fish disease, sprinkle the whole pool and use the pool water to make 1ppm.

two。 Disinfect the food farm with bleach once a month, once a day, 250g per feeding site. Before feeding it from 2:00 to 3:00 in the afternoon, dissolve the bleach and sprinkle it around the farm and then feed the fish. It can be used for 3-4 days.

3. After entering July, hang the bag every ten days in the food market, and make use of the opportunity for the fish to eat in the food market to come into contact with the drugs dissolved in the hanging bag to kill the parasites on the fish. Each time for 3-4 days, change the dressing once a day. Drugs can be used copper sulfate, ferrous sulfate, daily dosage of 100 grams and 40 grams. The two drugs are used separately. Each food farm hangs 4-6 bags.

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