Low survival rate of M. rosenbergii seedlings is related to climate and water quality
On April 28th, Lu Yuanyu of Gaoyou City came to the telephone to report that he recently introduced a batch of Roche shrimp larvae from the Zhenghu shrimp farm in Wujiang. After 2-3 days of introduction, all of the larvae died and most of them were in shells. When it died, there were many Roche shrimp farmers, some of them were imported from Zhejiang, and the mortality rate was very high. He asked how the mortality rate of Roche shrimp was so high this year? What is the original cause?
The reporter contacted Sun Guixi, deputy director of the Agricultural and Forestry Bureau of Gaoyou Municipality, to understand the situation. Sun Guilu said that this year, the survival rate of Macrobrachium rosenbergii seedlings is relatively high, not only in aquaculture farmers, but also in the breeding quality of some Macrobrachium rosenbergii breeding plants. The quantity is also unsatisfactory, such as seed breeding farms in Jiangsu, Shanghai, Zhejiang, and Guangdong. Due to the small number of seedlings, some localities have even stipulated that local seedlings can only be supplied to local farmers. Last year, the supply of Roche shrimp was more than 35 billion, and this year there are only about 10 billion.
The low survival rate of Macrobrachium rosenbergii may be related to the two reasons. On the one hand, the broodstock of the Macrobrachium rosenbergii has a weak constitution, and on the other hand, the farmer does not perform good feeding and management after the shrimp seedlings are introduced. Sun Guilu said that due to the relatively long duration of the "cold spring" this year and the relatively low temperature, according to what they learned from the meteorological department, this year is the year in which the temperature in the spring is low and lasts for a long time in the past 20 years. In the early stages of the death of Macrobrachium rosenbergii, they invited a professor from Nanjing Agricultural University to collect a sample of the dead shrimp seed, but no virus or pathogen was detected.
In addition, the reporter also contacted Shen Xinglin, director of Zhenghu Shrimp Farm in Wujiang City, and Shen Changchang said that the phenomenon of low seedling survival rate and inability to hatch hatchlings in the early stage of larval rearing of M. rosenbergii , resulting in less supply of prawn prawn, the price is 4 times the same period last year. After the farmers reported to the field that the mortality rate after the introduction of the seeds was high, the experts asked the relevant experts for diagnostic analysis. The diagnosis results were caused by excessive levels of floating bacteria and bacteria in the Taihu Lake water. At present, under the guidance of relevant experts, the site will introduce the Taihu Lake water disinfection and purification treatment to be used as the hatchery water of the Macrobrachium roxburgi seedlings. The quality of hatched shrimp seedlings is relatively good and can be supplied to the market.
“At present, the loss of Macrobrachium prawn farmers due to seeding problems is relatively large, and this year the cost of Macrobrachium rosenbergii has risen by about 3,000 yuan per mu from last year. If the market price of Macrobrachium rosenbergii remains at the same level as last year, the profit of farmed fish is compared. Low.†Sun Guixi said that the Gaoyou Agriculture and Forestry Bureau intends to invite experts from Tangshan Qing, a crayfish breeding expert from the Jiangsu Provincial Institute of Freshwater Fisheries, and Gong Peipei, a shrimp culture expert from the Jiangsu Provincial Aquatic Technology Promotion Station, to start some crayfish and shrimp farming techniques in May. The training class will guide farmers to aquaculture other aquatic animals and reduce losses. At the same time, the Bureau also communicated with some of Gaoyou's crayfish farmers and agreed that their crayfish seedlings will be sold to subsidized aquaculture farmers at sub-market prices.
Vegetable Hollow capsule manual
Name:Hollow Vegetable Capsule
Major components:HPMC(Hypromellose) and purified water
Character:The product is cylindrical and is made of two hard and elastic empty sacs made up of two sets of cap and body. The bag is smooth, uniform in color, smooth in incision, free of deformation, non-toxic and harmless, and is no odor
HPMC: It is an anhydroglucose of the cellulose.HPMC can be derived from cotton seeds
Function: Used for containing solid drugs. Isolation of herbs
Specifications:Size0,size1,size2,size3,size4,size5
Store:Keep in a cool, dry, airtight place
Manufacturing:Zhejiang Honghui Capsule Co.,Ltd
Add:Qingshan industrial area, Xinchang County, Zhejiang Province(Chengguan Town, Quanqin)
Food Capsule,Hpmc Food Capsule,2 Hpmc Food Capsule,Size 2 Hpmc Empty Capsules
Zhejiang Honghui Capsule Co.,Ltd , https://www.hhcapsule.com