CATDOLL : CATDOLL: The crabs have just started to grow and there is a lot of moss in the pond. Can it be removed?

The excessive growth of a single algae in river crab breeding ponds has certain harm to river crab breeding. In particular, the filamentous algae moss is seriously harmful. Whether the control technology of moss in river crab breeding ponds is correctly applied directly affects the survival rate, specifications, yield and effect of river crabs. 1. The danger of moss. 1. After the moss reproduces in large quantities, it consumes the inorganic salts in the water area, resulting in the destruction of the normal nutrient metabolism of the pond and the deterioration of water quality. 2. Being covered by moss or adsorbed by aquatic plants, it hinders the photosynthesis of aquatic plants, causing the aquatic plants to shrink and die, affecting the water quality. 3. After the moss dies and decomposes, it produces toxic substances such as hydrogen sulfide and hydroxylamine, the water quality becomes black, smells bad, the ammonia nitrogen content exceeds the standard, and the dissolved oxygen content in the water body is low. 4. The decay of moss will not only affect or infiltrate the color of crabs, but also induce black gill disease and edema of crabs, reducing the quality of crabs.

2. Causes of moss. 1. Incomplete green pond. If there is a serious moss problem in the previous year, there is water accumulation in the crab pond in winter, and it has not decreased in the spring of the second year. The crab pond cannot be cleared and sunbathed before raising crabs. The incidence of moss in this crab pond is very high and the risk is also very high. 2. The water in the swimming pool is too fine. Before stocking the crab seedlings, the farm was not fertilized or fertilized, resulting in the water in the pond being too dry and moss growing. 3. Large-scale fertilization. If it is found that the growth of the dead grass in the water cover group is not ideal or moss has occurred, use a large amount of fertilization to make fertilizer, and the growth rate of moss will be accelerated after fertilization. 4. Excessive bait. Blind feeding will cause excess feed to be deposited at the bottom of the pond, and moss will grow after fermentation. 5. Excessive application of other phosphorus and unfermented organic fertilizers will destroy the ecology of the water area. Or put moss in the crab pond when transplanting water plants and conchs.

3. Prevention and treatment of moss. 1. Qingtang extension. Replace winter clear soup with spring clear soup. That is to say, from February to early March, after the temperature rebounds, remove excess pool mud, the thickness should not exceed 15 cm, sunbathe, and make clear soup after 20 days. Use 1.5 kg/mu of copper sulfate to dissolve the bottom and slope of the swimming pool in water, inject about 10 cm of water into the pond after 5 days, and then use about 150 kg/mu of quicklime to evenly spray the entire pool. 2. Fertilizer water quality. 7 to 10 days after the end of sugar disinfection, start fertilization, cultivate fertilizer water quality, and inhibit the growth of moss. 3. Put snails in batches. The amount of conch put in at one time is too large, and the water quality is not easy to cultivate. A part can be put in around Qingming, and then it can be put in gradually in appropriate amounts later. 4. With silk stockings fish. Mix an appropriate amount in the crab pond, and stock scraping fish such as fine scales and oblique chins, which can eat some moss in the water. Through the activities of these fish, the transparency of the water is reduced, which can further inhibit the growth of moss.

You can use drugs to kill moss. Currently, the two most commonly used types of drugs for killing moss are crude sodium humate and moss cleaner. The former is relatively safe and sound. Its principle of killing moss is to kill the moss by reducing the transparency of the water after using the drug, while the latter directly eliminates the moss through the action of the drug.

Of course, the excessive growth of algae is harmful to river crab farming.

For ponds with serious moss, DBNPA can be used to kill the moss! DBNPA is a popular green fungicide and algaecide in the world today.

Algae and moss are seriously harmful. Whether the prevention and control technology of moss in crab breeding ponds is correctly applied directly affects the survival rate, size, yield and effect of river crabs.