This year, due to the large amount of water recharge in Xiaoshan District, and the relatively abundant rainfall, the salinity is generally low. As for the water quality of some of Xiaoshan's reclamation rivers and aquaculture ponds, the salinity of many rivers and ponds is less than one inch, resulting in many Penaeus vannamei farms survived after laying their seedlings, and there was even a large number of deaths. On May 14th, May 20th, Xiaoshan Yongtong Aquatic Planting and Seedling Farm, Xiaoshan Beigan Aquaculture Co., Ltd. and the Fisheries Science and Technology Department of the District Agriculture Bureau together in the Xiaoshan Shunba Cofferdam, the 15th and 13th sections of the river course. And pond waters for trial seedlings research. After multiple and multiple tests, PH, ammonia nitrogen, and nitrite have little effect on the desalination of Penaeus vannamei. Within the pH range of 9.5, ammonia nitrogen and nitrite are around 1.0 mg/l. As long as the salinity can reach 2 ‰, the survival rate of P. vannamei seedlings destined to about 3 ‰ is less affected. If the salinity of the pond is less than 1 Torr, the survival rate will be greatly reduced after the seedlings are released. If the salinity is only about 0.5 Torr, then the mortality rate will reach 80% after 1 week. At the same time, we conducted a production test at Xiaoshan North Dry Aquaculture Co., Ltd. In the 0.51 foot Xiaoshan reclamation pond, every 100 cubic meters of water, evenly sprinkled 150 250 kg of edible salt, and stocked 200,000 desalinated seedlings, after 48 hours. About breeding and desalination, no dead seedlings were found and the breeding effect was very satisfactory. Therefore, we believe that salinity has the greatest impact on the dilution of Penaeus vannamei into the pool. To this end, Xiaoshan Yongtong Aquatic Planting and Seed Farm, for the sake of farmers, the feeding of feed to the main insects, supplemented by shrimp, etc.; desalination time of more than 10 days, the salinity dropped to the lowest point, that is about 2.5‰ The measures to dilute the seedlings to more than 1 cm have greatly improved the survival rate of Penaeus vannamei after stocking. Xiaoshan Yongtong Aquatic Planting Plant has now diluted 350 million high-quality white shrimp seedlings in South America. Many farms and farmers are still making reservations and bookings. Cooling Patch,Fever Cooling Patch,Baby Cooling Patch,Cooling Gel Patch Weihai Kangzhou Biotechnology Engineering Co.,Ltd , https://www.weihaikangzhou.com
Salinity is the key to affect the survival rate of Penaeus vannamei