Seasonal high temperatures, high rainfall, and rapid growth are key stages in fishery aquaculture management. In order to ensure the healthy, safe and smooth operation of fishery culture and ensure the bumper harvest of fishery production, the following technical opinions are specifically proposed:
1. Strengthen water quality management. In summer, due to high temperature, large feeding amount, and large amount of fish excretion, the water quality is easily polluted. It is necessary to add water or change the water every 7-10 days, changing the water every time by 10-15cm. The intensive fish ponds need to be equipped with aerators, which are normally turned on at 2-3 o'clock in the sunny hours, and they must be turned on when there is a risk of floating heads. In addition, it can also be used to regularly adjust the sediment, remove the source of pollution and other methods to adjust the water quality. The pond maintains a water depth of 1.5-2m. Generally, the transparency of the pool water is maintained at about 25cm. The water is brownish-brown, yellow-green or oil-blue, which can promote the growth of fish. Every 10-15 days, use lime 20-30 kg/mu to adjust water quality once.
2, vote for feed. When the water temperature in summer is 20-28°C, the growth of fish is the fastest and you should invest enough feed. General daily pellet feed 3-4 times. The amount of feed to be fed was within 30-40 minutes after being dropped. When the water temperature exceeds 32°C, the optimum growth temperature of the fish has been exceeded, and the feed amount of the feed can be appropriately reduced. Feeding amount of feed should also follow the influence of weather, water quality and other factors. The weather is clear, the dissolved oxygen in the water is high, the food intake of the fish is large, and more investment is appropriate; the weather is sultry, the dissolved oxygen in the water is low, the fish eat less food, and the residual feed is easily spoiled and deteriorated, and less or no investment is required; the water quality is refreshing and the fish eats well. , More investment; poor water quality, less vote or not vote.
3, prevention and treatment of fish diseases. Summer is a season of fish disease. It is necessary to focus on disease prevention. The food platform should be cleaned once every 10 days. At the same time, 0.5kg of bleaching powder or 10kg of quicklime should be used in each food field. Sprinkle after hydration, and use 1ppm of bleaching powder every 2 months. Chlorine oxide 0.3ppm or quicklime Quanchiposa once.
4, anti flooding pond. Nighttime ponds should be stepped up. If fish or other fishes are found to float or have abnormal reactions before dawn in the evening until the next day, the earlier the time, the more severe the lack of oxygen. At this time, chemical oxygenation agents (requiring reserve) or aerobics can be thrown away. Machine, increase oxygen to sunrise the next day to prevent pan-tang events.
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