Management technology of aquaculture in summer

Before cultivating and stocking seedlings, the pond should be cleaned and disinfected. In summer, we should pay attention to the bubble disease caused by the excessive growth of algae in fish ponds, adjust the water quality in time and control the abundance of algae. Fish fry should be divided into ponds in time to prevent the growth specifications from being too different and carnivorous fish from eating too much. Anti-stress, anti-hypoxia and disinfection should be done before and after pond separation.

Water quality control in summer, continuous high temperature, large temperature difference between day and night, vigorous metabolism of aquatic animals, easy anoxia of bottom water, serious deterioration of bottom environment and rapid change of water quality. Water quality control should be carried out in time to ensure the stability of aquaculture environment.

● Replenish fresh water appropriately, generally once every 7- 10 days, and keep the water level at 1.5-2 meters. When adding fresh water, try to avoid washing the bottom material.

● Strengthen the detection of pH, ammonia nitrogen, nitrite and other indicators of pond water environment, and take measures such as changing water and increasing oxygen in time if any abnormality is found; Pay attention to monitoring the dissolved oxygen in the culture pond, and turn on the aerator frequently to prevent the cultured fish from floating head due to lack of oxygen. The use of the aerator should follow the principle of "three on and two off" (noon on sunny days, early morning on cloudy days, midnight on rainy days; Closed on cloudy nights and at noon). "Youjiling" has multiple functions such as complexing toxins, enhancing anti-stress ability and stabilizing algae. It has already become a "fragrant cake" for many farmers to regulate water quality and cultivate fry.

Frequently improving the bottom environment of the pond during high temperature can effectively inhibit the growth of pathogenic microorganisms, accelerate the decomposition of harmful substances in water, promote the circulation of organic substances in aquaculture water, and keep the water in good condition.

Choosing suitable feed and adopting scientific and reasonable feeding methods are important links of healthy breeding in summer.

● In summer, the days are long and the nights are short, so the feeding method of "small amount and multiple times" can be adopted, and the full-price compound feed can be fed according to the principle of "fixed quality, quantitative, fixed point and timing".

● Feed should be kept fresh, free from impurities and deterioration; Feeding frequency and feeding quantity should be properly judged and adjusted in time according to different factors such as weather, temperature, water quality of aquaculture water and fish body specifications. Feed more on sunny days, feed as little as possible on cloudy days, and don't feed on rainy days; Feed more at noon in the morning, feed as little as possible at night, and generally do not feed at night; The feeding amount should be 7-80% full for cultured fish, and it should be 1-2 hours each time. "Myna" has the functions of attracting food, promoting growth, protecting liver and gallbladder, and improving intestinal immunity. Adding myna to feed can not only promote the healthy growth of cultured varieties, but also reduce the cost of breeding and realize "reducing costs and increasing efficiency", which has been successfully applied in many places.

● Continuous high temperature in summer will lead to high surface water temperature but low water temperature, which will easily lead to stress reaction of cultured animals. We can reduce the temperature difference of water body by setting sunshade facilities, gradually deepening the water level in the pond, and using low-temperature water to cool down, so as to keep the temperature of water body relatively stable and avoid the stress reaction of cultured animals due to high temperature.