Low Salinity Culture Technology of Penaeus vannamei

Zhong Liqiang, a farmer of Qijia Temple in Wangtan Township, Laoting County, received a good harvest in the cultivation of white shrimp in South America in 2003. After 13.3hm2 of ponds were farmed for 4 months, 3750kg of shrimp were produced per hectare, and the profit was about 60,000 yuan. Here is a brief introduction to its breeding technology. Preparation before laying seedlings 1.1 Ponds After preparing ponds for cultivation, dry ponds, after a winter freeze drying, water 5 ~ lOcm, lime 1250-1500kg or 225kg bleaching powder for each hm2 application of the bottom of the pool to disinfect, sludge thicker fishing first Dredging, and then remove the weeds around the pond, repair pools, pool walls, to prevent leakage. 1.2 Influent fertilizer Clearance pond disinfection After 5 ~ 7d, a large number of water 50 ~ 80cm, when entering the water with a 40 ~ 60 mesh sieve mesh filter, put a seedling 7 before 1Od per hm2 put fermented chicken manure 1500kg fertilizer water, After one week, the transparency of the pool water is controlled at about 35cm. The water is yellow-green or yellow-brown, and the shrimp and seedlings are under water to make the shrimp seedlings have a sufficient quantity of palatability feeds; and the nutrition is comprehensive and can improve the shrimp's own immunity. Shrimp stocking summary of two years of experience, this year will be set to lay in mid-June time, stocking shrimp more than 1.5cm choice, strong physique, good vigor, strong water resistance, muscle transparency, smooth and shiny body, uniform specifications High quality shrimp seedlings, 375,000 seedlings per hm2, due to robust shrimp adaptability to the external environment, coupled with adequate natural food, aquaculture survival rate of more than 60%. 3 After feeding the l0d of the shrimp pond, the bait was started to feed. After comparison, the special feed for white prawns produced in our county was selected. The feed of 38% to 41% of the protein was fed in the early stage to allow rapid growth; the late bait protein was 30. About %, the bait coefficient is 1.3:1. During the aquaculture process, we must adhere to the “quadruple” principle of qualitative, quantitative, timing, and positioning. The amount of bait and the number of feedings should be adjusted along with the growth of the shrimp. Generally, the medium feeding amount is the wet weight of the shrimp. % 8%, feeding 3 times a day; 4% to 5% later, feeding 4 times, during the feeding process, insist on casting more in the morning and evening, less in the daytime; more than four weeks, less in the middle; , The principle of less investment in rainy and anoxic conditions; 4 Influent and salinity adjustment Aquiculture water uses underground saline to fresh water, and the formulated aquaculture water is 5‰ to 6‰, suitable for rapid growth of shrimp. During the breeding process, in order to maintain the pool water temperature, the initial water depth can be about lm. As the temperature rises, the water level is gradually deepened, and the high temperature period reaches about 2m to control the day and night temperature difference of the pool water and the temperature difference at the bottom of the pool. In order to make the pool water fresh and rich in dissolved oxygen, replace 1/3 of the pool water every 7-10d for high temperature season, and use the compound biological water purifier or application-photosynthetic bacteria to create a good environment for the growth of shrimp. Water quality regulation and disease prevention During shrimp aquaculture, the prevention of shrimp disease is an important part of aquaculture production. Zhong Liqiang insisted on using biological agents to regulate water quality in the breeding process. Each 10-15d alternately used special effects to protect water treasures, biological fertilizer and water, etc., so that beneficial bacteria breed in the pond, inhibiting the development of harmful bacteria, and at the same time absorbing The harmful gases and salts in the pool. In addition, in the middle and late breeding period, there is too much excrement in the bottom of the pond, resulting in high levels of ammonia and nitrates in the pond. Chlorine dioxide and bromochlorohydantoin are used regularly to improve the pool water.

Others Frozen Vegetables

Greenfarm Import And Export Co., Ltd. , http://www.jn-foods.cn