With the gradual increase of the high-yield level of intensive culture in Tanggu Aquaculture, the input to fertilizers and feeds for aquaculture waters has also increased accordingly. During the summer high temperature season, especially for aquaculture waters with strong alkalinity (PH8~9.5) and high nitrogen and low phosphorus, The large-scale propagation of blue-green algae often occurs, forming a layer of green, cloud-like, band-like "bloom" on the surface of the water. If neglected or handled, it is very easy to cause loss of breeding. The formation of "bloom" not only hinders the incorporation of oxygen in the air, reduces the dissolved oxygen in the water, but also "fights oxygen" with the aquaculture aquatic animals. Especially at night and continuous rainy weather, it will exacerbate the lack of oxygen in water bodies. degree. At the same time, “bloom†also induces the toxicity of nitrites and sulphides, and blocks the escape of toxic gases, which will deteriorate the water quality of aquaculture waters and cause the occurrence or outbreak of aquatic aquatic biological diseases. After the algae in the “bloom†die, the algal protein corrupts and decomposes, producing hydroxylamine, hydrogen sulfide, and other harmful substances that can cause aquatic life to die; in addition, algae toxins accumulated in fish and aquatic organisms may pass through the food chain. The cumulative effect of harm to human health. "Water bloom" control measures: First, mechanical oxygen. At noon on a sunny day, oxygen is used to increase oxygen and transported to the lower water body to accelerate the decomposition and transformation of the underlying organic decay material. At the same time, the harmful gas at the bottom layer is brought to the surface to aerate and escape. The second is to increase the exchange of water. Change the amount of water as much as possible in 1/3 or more, it is best to replace the surface of the fertilizer. The third is to control feeding and fertilization. To reduce the amount of feed, especially as far as possible not to cast materials, powder, to avoid food and excretion and feed loss and fertilizer; without appropriate application of phosphate fertilizer nitrogen fertilizer, accelerate the formation of phosphorus-rich diatom dominant population, inhibit the reproduction of blue-green algae. The fourth is the use of chelated copper. Use a concentration of 0.6-1.0 g/m3 to improve the traditional use of copper sulfate to kill algae. Fifth, ecological control. The appropriate quantity of tilapia or whitefish is stocked, blue-green algae are ingested, and aquatic plants such as water hyacinths are transplanted to reduce water body fat. The sixth is to pay attention to the inhibition of blue-green algae in the hot season. Prevent the increase of calcium and PH value in water, more conducive to the growth and reproduction of blue-green algae.
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