The earlier the crayfish emerge in autumn and winter, the larger the size of next year's shrimp fry will be. Large shrimp fry can reach the market specifications after a month of rearing, of course, the earlier the adult shrimp market time, the more dominant the price. After the harvest of rice, the adult shrimp pond will generally be placed until the end of February and the beginning of March next year, and then carry out water, grass planting, seedling release, and adult shrimp feeding throughout the year; however, for the nursery pond, it is necessary to carry out comprehensive management, and at the same time, the following work should be done to quickly produce early seedlings.
If you want to produce early seedlings, you must be prepared in the following four aspects:
The first is the morning water, which is generally recommended to be fully watered before October 15th, forcing the crayfish shrimp out of the hole and allowing the egg-holding shrimp to hatch. Some of the water is relatively early, especially at the end of September and the beginning of October, now you can see 1-1.5 cm of shrimp fry in the pond mouth, which is very conducive to the listing of shrimp fry in the early next year, and can also be listed in advance. If there is no water now (October 18), then seize the time to carry out the water, once you enter the water in November, it will be difficult to produce early seedlings.
The second work after the water, it is necessary to carry out a comprehensive detoxification of the pond mouth, remove the residual disinfectants, pesticides, pesticide residues, etc. in the pond, and then quickly carry out comprehensive fertilizer water after detoxification; the purpose of fertilizer water is to cultivate beneficial algae, it is recommended to consider in many aspects, do not use a single fertilizer and water product, you can use fertilizer water paste (Wang algae fertilizer water treasure) with biological fertilizer and fertilizer to improve the effect of fertilizer water. Biological manure is good, but it is necessary to use EM bacteria fermentation liquid for biological manure for fermentation, which can effectively kill a large number of bacteria, viruses, parasite eggs, etc. in the feces, and at the same time can mature the feces, promote the escape of nutrients and facilitate the spread of fertilizer. Biological manure use can not be excessive, in the autumn and winter temperature is low, fertilizer diffusion is affected, the next year after the water temperature rises, very easy to spoil water; fertilizers such as urea, ammonium carbon, phosphate fertilizer, etc. Although the effect of fertilizer water is fast, the cultivation of algae is fast, but it is extremely unstable, the fertilizer effect is also fast, the algae phase aging is also fast; so in the fertilizer water, it must be used together with fertilizer water paste in many aspects, such as: poly water source, fertilizer water eighteen supplements, etc.
Third, as long as a large number of shrimp fry hatch, it is necessary to control and feed the water quality of the pond mouth, control the water quality, and use more strains, such as: bacillus (Dr. Liang Huoshui), lactic acid bacteria, EM bacteria, etc. to decompose the organic matter in the rice straw in the water and stabilize the water quality. When feeding, the full price of crayfish is used with feed plus bait duobao, which can not only provide a lot of food for shrimp fry, but also play a good role in fertilizing water, cultivating beneficial algae and insects for shrimp fry to eat. Strengthen the amount of feed, on the one hand, to ensure the nutrition of the shrimp, to improve the hatching rate of the shrimp, on the other hand, to provide a large amount of food for the juvenile shrimp, to promote the rapid growth of the young shrimp; feed to add drugs to improve immunity and promote digestion, such as: 99 shrimp crab mix king, water kang king are a very good choice, while choosing to use these drugs is not only to promote a rapid growth of shrimp, the most important thing is to improve the survival rate of shrimp fry.
The fourth aspect is to do a good job in winter management, plant good aquatic weeds to do a good job of keeping warm, aquatic weeds will generally be planted in the middle of November, the retained part of the stubble is also conducive to the warmth of the water body, while organic matter can also cultivate beneficial algae and insects for juvenile shrimp to eat. Doing a good job of fertilizer water can also effectively prevent the outbreak of moss, once the moss outbreak can absorb a lot of nutrients in the water body, reduce the food of shrimp fry in the water body. Winter management should also do a good job of feed delivery to prevent the death of juvenile shrimp due to food shortages caused by too little feed stocking.
Can do the above four points, basically can ensure that in the coming year at the end of February, the beginning of March there are a large number of shrimp fry can be listed or to provide a large number of seed to the adult shrimp pond, which is conducive to the morning market of adult shrimp.