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Cultivation ponds to prevent algae damage
In pond fish farming, a large amount of harmful algae is often produced, resulting in deterioration of water quality, affecting the growth of fish, and even causing fish poisoning death, which can reduce the economic benefit of pond culture by 15% to 20%. The comprehensive control techniques for several major algae in aquaculture ponds are introduced below. First, Spirogyra, Double Star Spirulina, and dinoflagellate grow in shallow water at the pond after the weather warms up. They grow into filaments, and the bottom is tied to the bottom of the pool. The upper end stands upright in water. It is also called a deep-water filamentous plant. When it is senescent, it breaks away from the bottom of the pool and floats in the water to form lumps of tangled fish. Frogs are mistaken for them and are often entangled and die. In addition, a large amount of chaotic filaments floating in the water seriously affects the absorption of light by plankton and the increase of water temperature, hinders the dissolution of oxygen, and consumes a large amount of nutrients in the water to make the pool water thinner and affect the growth of the fish. Lime dry clearing pond before stocking, using 75 kg of lime per acre. After ponds with poor sediment quality, 200 to 300 kg of organic fertilizer is applied per mu. Sponge, etc. After the occurrence of copper sulfate solution Quanchiposa, so that the pool of copper sulfate concentration of 0.7 mg / liter, 2 days after the change of 1/3 of the new water; per acre with prometryne net 150 to 200 grams, mixed wet soil after Yang Sprinkle on the blue mud moss; Scatter with blue ash on the blue mud moss. After 2 days, use 10 kg of quick lime for each mu. Second, water net algae commonly known as green algae, mostly occurs in the more shallow shallow water fish ponds, because of the shape of the algae after the collection of net belt, so the young fish fry into the net is difficult to come back, the nets live by the fry Respiratory and feeding difficulties cause death. Lime dry clearing pond before stocking, using 75 kg of lime per acre. For example, if water net algae occurs, splash copper sulfate to make the copper sulfate solution in the pool water kill at a concentration of 1.5 mg/L, and the splash area is 1/5 of the pond area. 3. Microcystis aeruginosa and Microcystis catarrhalis are commonly known as lake trout and copper rust water, and they mostly occur in the high humidity season, especially when the water temperature is 28 to 30°C and the pH value is 8.0 to 9.5. Faster growing season. The hazards are twofold: First, when algae die in large quantities, the proteins contained in them rapidly decompose and produce harmful substances such as hydroxylamine (NH2OH) and hydrogen sulfide (H2S). After these substances reach a certain concentration, the fish will have a lot of Death, especially to the upper layer of fish, is more harmful. Second, when it grows excessively, the lack of dissolved oxygen in the water causes a large number of deaths of fish, which makes the pool water more and more severely anoxia. This phenomenon mostly occurs in the middle of the night. When the amount of oxygen dissolved in the pool water is at its lowest in the early morning, it can easily cause the fish to lose oxygen and die. Before stocking, 500-1000 kg of base fertilizer per acre is used to make the pool water maintain a certain degree of fatness; frequent exchange of fresh water is needed during the hot season; a certain number of tilapia can be provided with certain conditions. In case of lake trout, copper sulfate solution Quanchiposa, so that the pool of copper sulfate concentration of 0.7 mg / liter; also in the early stages of the production of tilapia per acre 1000. 4. Polydendron and nilaceous dinoflagellates are commonly called red water, and they often occur in high-temperature water bodies with many organic substances, high hardness, and slight alkalinity. They are very sensitive to environmental changes, such as sudden changes in water temperature and pH. Will die a lot. After they die, they produce dinoflagellates, which kill fish poisoning. Therefore, you should be especially vigilant in the season where the temperature changes greatly. Before the occurrence of the accident, new water is often replaced to adjust the water quality and destroy the environment. After the occurrence of 15 kilograms of lime per acre, to increase the pH of the pool water, abruptly change its aquatic environment and cause it to die, and then replace the dead algae with new water; it can also use a copper sulfate solution Quanchiposa to make the copper sulfate concentration in the pool water 0.7 Milligram/liter, change 1/3 new water after 2 days. V. trichophyton It can secrete a toxin causing fish poisoning the central nervous system caused fish death. In the aquaculture water, the number of algae is more than 30 million/liter. When the water is yellow-brown, it will cause a large number of fish such as clams, cockroaches and cockroaches to die. Before the occurrence of the application of organic fertilizer and phosphate fertilizer, fertilizer pool water, so that beneficial algae as the dominant population; often pay attention to the water after the fertility of the fat, it is best to make the water to maintain transparency of 25 cm. After the occurrence, the golden water algae was replaced with fresh water, and then phosphorus fertilizer and manure were used to regulate the water quality. The copper sulfate was splashed to make the copper sulfate concentration in the pool water 0.7 mg/l, inhibiting the secretion of toxin from the algae, and then replacing the fresh water.