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Application and Control of Moss in Shrimp Culture
Moss has both advantages and disadvantages in shrimp farming. How to seek benefits and avoid hazards is of great significance to shrimp aquaculture. In the early stages of the shrimp farming-fat and water stage, if the fertilization is not properly made into the pond in the winter season, there will usually be a large amount of moss in the shrimp pool in the spring of next year. With the increase of water temperature and temperature, it gradually appeared. To the hot season, it will gradually change white, causing the bottom of the pool to emit a bad odor, and even cause pan shrimp pool. At the same time, the moss poses a great threat to the already-watered shrimp seedlings. Once the water-feeding shrimp seedlings reach the moss and struggle, they can only dry up and die. Moss has a disadvantageous side to the shrimp farming industry, but there are also favorable aspects. First, the moss itself can be used as a bait for shrimp, and shrimp can be used as a bait from seedlings to adults. Second, mosses are good habitats and carriers such as the one-toothed larvae and the quail-toed oysters, which provide indirect feed for shrimps. Third, moss can provide a hiding place for shrimp to prevent the invasion of enemy animals. Prevention of shrimp production in the production of moss flooding there are several ways: First, after finishing the shrimp, the shrimp pond water drained, bulldozers dug away the surface silt, no water in winter and early spring. Second, in the spring when water and fertilizer are used, it is necessary to use reasonable fertilization according to the fertility of the water. Do not receive shallow water and apply more fertilizer. Once the pond moss is flooded, the water level needs to be raised as quickly as possible to reduce the transparency, so that the propagation of the moss can be inhibited by the rapid propagation of the unicellular algae. Thirdly, when there are more mosses in the pool, if they are removed, do not use nets to avoid spreading and flooding. When there are a lot of moss in the shrimp ponds, the methods to clear them are: First, a large number of mosses appear in the unriven shrimp ponds. The limes are splashed and burned into copper sulfate to kill them, then they are quenched. Then the tides are swept repeatedly and the pool is brushed again. Pool. Secondly, one way to store shrimp seedlings is to remove the moss on the surface of the pond to the corner of the pond on a windy day. Manually remove the moss on the surface of the pool and keep it in the pool and bottom of the pool while applying photosynthetic bacteria every 15-20 days. 5 kg/mu. In this way, the corrupted moss has no pollution and harm to the pool bottom and shrimp. An alternative method is to use paracetamol 1ppm. Application method: Mix the paraquat with the sediment, the ratio is 1:100-1:2O0, and the humidity is appropriate. Choose to apply the drug when the dissolved oxygen is high in the sunny afternoon, and during the large swell, continuously change the water 24 hours after the application until the pool of dissolved oxygen is normal.