First, living habits: life of shrimp is generally only 12-15 months, male life is shorter than female shrimp. Overwintering green prawns usually begin to die in May. The last harvest time should be in April, and they should not be planted at the beginning of the year and harvested at the end of the year as the fish farming model. In the year of July-August, the shrimp was stocked until the last harvested dry bottom in April of the next year. Green shrimp need to be shelled more than 20 times in one life. Since the green prawn camp is attached to life, unlike fish, which live in the water layer, it is necessary to transform the farming environment into a three-dimensional space with a multi-layered adhesive layer. The sediment is required to be mud bottom, and is generally inhabited on the muddy bottom of aquatic plants. In particular, it prefers a shallow water environment. In addition to the deep water layer in winter, the growing season usually does not exceed a depth of 1 meter. Green shrimp living in aquatic plants can both escape predators and prey on food creatures that have gathered in aquatic plants. In order to increase shrimp production, we must first create a three-dimensional space for the activities of the shrimp, and provide aquatic plants to the shrimp ponds. However, the coverage of aquatic plants should not exceed one third of the surface of the water.
Second, the water quality requirements: aquaculture water body can be in ponds and paddy fields and other water culture. The water quality requirements are “fat, live, tender, and coolâ€, which is particularly suitable for fresh water quality. Saline and freshwater with low salinity in the estuary can also grow. However, the "dead water and old water" that are not so good are not conducive to the growth of shrimp. Therefore, it is suitable for the cultivation of shrimp only in places where drainage and irrigation are convenient.
Third, Shrimp pond clearing: Putian shrimp farming to dig pit from the "Lee", mu 50 kg later with lime tea bran 20 kg, pond shrimp mu with 100 kg of lime disinfection after disinfection with tea bra 40 kg disinfection , and then planted yarrow. Lime disinfection is to increase calcium, which is conducive to the shelling of shrimp. The transformation of Putian is easy for ponds, so under the same farming conditions, the shrimp production in Putian is higher than that in ponds.
Fourth, the source of seedlings: mainly from the river shrimp shrimp shrimp back to the stockpile acquisition, these shrimp species are different in size, more or less injured, the survival rate of stocking is low. The source of protection is not guaranteed. Individual shrimp farmers will have no shrimp species to fall in the second pond after the first pond, which will have a greater impact on production. Many professional shrimp farmers report that shrimp species are faster than pond species, and may be closely related to the inbreeding of pond species, resulting in poor individuals and poor growth. The Shilou is a large-scale shrimp breeding town in our district. Now it has entered the preparation stage for the hatching of the green prawn, and it is expected that the prawn will be supplied to the shrimp farmers.
V. Stocking density: The majority of shrimp per acre is 10-15 kg. The size of the shrimp shrimp in the ponds is about 700 per kilogram, and about 100-200 kilograms per kilogram are made. The general shrimp farmer “drops 1 kilogram (shrimp species) and 1 kilogram (prawn)â€, mainly because the survival rate of the ponds is low, but occasionally some individual shrimp farmers “drop 1 kilogram from the 3 kilogramsâ€.
Six, polyculture varieties: acre put 0.5 kg or so squid does not exceed 10 (grass, moss), big head, quail each put 5 (adjust water quality), and the other enlarged specifications black storks a few tail (eat snails). However, if each species is released, it will cause disadvantages or constitute a threat. These eating fish will eat shelled shrimp when there is insufficient feed.
Seven, food delivery: Green prawn omnivorous shrimp, strict requirements on bait, prawn to plankton for food, followed by aquatic insects, plant debris, organic debris, dead bodies of aquatic animals. Under artificial breeding conditions, shrimp can be eaten on various fish-feeding diets (rice bran, raw bran, soybean cake, clam meat, snail meat, and fish flesh), especially fermented feed such as lees. When there is a shortage of feed, it will eat itself. It has negative phototaxis to the light and lurks in the dark during the day and feeds and activities at night. Therefore, feed delivery is mostly carried out when it is dark.
Eight, breeding cycle: shrimp is a wide temperature shrimp, water temperature above 14 °C began feeding. Low requirements for environmental conditions, safe wintering under natural conditions. The optimum temperature for growth is 25-30°C. The adaptability to sudden temperature rise and fall is very strong. Breeding technology is easy to grasp, and the breeding cycle is short. After stocking for 4-5 months, they can be listed and arrested in batches. The breeding technology and management level can keep up with the shrimp farmers. The shrimps of the year of stocking can also be listed in the same year.
Nine, harvest and listing: When the water temperature is above 18°C, the activity of the shrimps is frequent and can be used for “crawfishing cage†loading. When the temperature is low and the prices are collected before and after the “Chinese New Yearâ€, only the dry bottom is adopted to “catch up and stay smallâ€. Ways to proceed.
The name of the shrimp is Japanese giant shrimp, commonly known as big shrimp. Because of its blue-green color and accompanied by brown-green markings, it is named Qing shrimp. Widely distributed in various fresh water bodies in China, with the highest yield south of the Yangtze River. Green shrimp and Macrobrachium rosenbergii belong to the same species of Macrobrachium, and they are similar in appearance, but individuals are significantly smaller than Macrobrachium rosenbergii. Due to a wide range of water bodies for breeding, low requirements on conditions, poor feed requirements, and easy-to-handle methods, the cultivation of freshwater shrimp is a preferred target for low investment, low risk, and quick response.