A few days ago, Liantang Town, Gaoyao City, Guangdong Province, a member of the South China Association for Aquatic Disease Control and Prevention, and a fisherman Rong Zhichao from the Chaoyang Fisheries Clinic of Baitu Township, Gaoyao City, introduced the disease control and aquaculture management techniques of Macrobrachium rosenbergii to local shrimp farmers. The local Roche shrimp farmers attended the meeting. It is understood that the current breeding area of ​​Macrobrachium praecox in Gaoyao City is about 50,000 mu. The farming mode is one year, one year or two years, or two years and three years. It is mainly the mode of planting valerian (Black Impala) and covering the winter shed. Accounted for more than 300 kg -700 kg per mu.

Picking seedlings to choose old seedlings

Rong Zhichao said that the first step in raising Macrobrachium rosenbergii is to select good seedlings and try to select the seedlings of the Dachang plant so as to avoid the purchase of shrimps that have been used for inbreeding and hatching. When the seedlings are cast, they must pay attention to the water to be free from pollution, and the indicators cannot exceed the standards. In particular, the pH value is generally maintained at between 7.8-8.6. It is appropriate to match the pH value of the packaged water at the time of purchase, select the old seedlings, and test the water successfully. Pay attention to the use of microbial preparations for the cultivation of biological feeds, and appropriate amounts of shrimp feed supplements to improve the survival rate.

It is the key to plant and protect the grass.

The successful cultivation and care of barnyardgrass is a key part of the success of breeding. Into the water (30 cm - 50 cm) species of barnyardgrass, barnyardgrass exposed 10 cm above the water surface, can survive in half a month, regular nursing after the seedlings, keep the water quality fresh, Moderate transparency (30 cm - 50 cm), the middle and late period to sort out the road, the control of high density and withered. “Hypericum can not only improve the quality of water quality, but also provide a three-dimensional space to reduce the killing of Macrobrachium rosenbergii, and it can also be used as a green feed to increase the taste and reduce muddy taste of Macrobrachium rosenbergii.”

Avoid using self-drawing material

“Feeding recommends the use of better quality materials and avoiding the use of self-drawing materials, because Roche Macrobrachie eats and clamps to eat. Since the water content of the self-dipping material is high, it is easily dispersed in the water. The shrimp not only did not eat material and polluted the water. “Yong Zhichao said when it comes to feed selection and feeding methods, a good tonnage of over 9,000 yuan can bring good yield to the average shrimp, so it would rather feed less and also feed good-quality shrimp. "The proportion of pre-loading is larger, and small meals can be served in small quantities. In the middle and late periods, it is usually two meals a day. In the afternoon, you can feed a little more. The daily amount is generally about 3%."

During the middle and late breeding period

Macrobrachium rosenbergii need to prevent white turbidity during the shrimp seedling stage. It is recommended to regularly use povidone iodine and Chinese herbal extracts (such as Wuhuang) to prevent spillage. If the valerian planting is successful in the middle and later stages, the shrimp disease is generally less. Common diseases in the middle to late period include soft shell disease, fatty liver, crustacean ulceration, black rot disease, colitis and Vibrio infection. It is recommended to use calcium supplements at regular intervals in the middle to late period, and use a course of hepatoprotective and anti-inflammatory drugs every half a month for prevention. At the same time, changing the end and using biological bacterial water can generally prevent shrimp disease.

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