Scientific management in the early stage of fish and shrimp mixed culture mode to improve the survival rate of prawns
Release time:
2024-03-04 10:13
Mixed culture of freshwater fish and white shrimp in Jiangsu coastal areas is a more efficient mode of aquaculture, which can make full use of pond space and resources to create higher economic benefits. In the process of many years of technical services, found that the early survival rate of this mode of culture is an important limiting factor affecting the production of white shrimp.
1, improve seedling survival rate
Many factors affecting the release of seedling survival rate, put seedlings when the water quality difference, shrimp seedling desalination is not good, easy to cause intense stress of shrimp seedlings. In addition, the release of seedlings when the poor physical quality of shrimp seedlings, repeated molting, after the release of seedlings after the lack of food, will also affect the survival of shrimp seedlings. Therefore, before and after the release of seedlings to do a good job of stress, to ensure that the difference between the salinity of the pond and the seedling pond should not exceed 2 grams (about 2.8 ‰).
2, after the release of seedling prevention and control of air bubble disease
Pond water level after the release of shallow, over-fertilized water, small algae, early day and night temperature difference, water quality is not stable, etc. are likely to lead to the occurrence of air bubble disease, causing acute death or secondary bacterial infection. Release seedlings when the pond water level as deep as possible (recommended more than 1 meter), according to the weather, water quality, water stabilization, good prevention.
3, put the “liver” this off!
Liver is the most important functional organ of the shrimp, with immunity and digestion and absorption of a number of functions, liver is the shrimp liver comprehensive development, function of the process of comprehensive improvement, is one of the most critical steps in the growth and development of shrimp, general shrimp seedling specifications up to about 3 ~ 4cm, put the seedling more than 20 days to start entering the liver, liver liver lobules after the success of the liver significantly increased the number of liver digestion, metabolism, significantly strengthened function. “Liver” is the shrimp most sensitive to changes in the external environment, but also their own resistance is the weakest, most prone to disease, shrimp farming is a large part of the ‘liver’ problems.
Shrimp that can't turn the liver properly are generally characterized by poor feeding, poor grabbing, unable to add material, and slow growth. Disease resistance declined, easy to disease steal death. “Liver” unsuccessful reasons on the one hand, drastic changes in the environment, frequent algae, hypoxia, bubble disease. On the other hand, the feeding amount is not enough, shrimp seedlings eat a lot of dead algae, mud. Therefore, the liver to do a good job of stabilizing the water, increase oxygen, maintain water stability; in addition, do a good job of internal liver protection, you can use the liver and bile protection and nutritional supplementation of feeding products.
4, pre-control of vibriosis
Vibrio disease is the most important bacterial disease of shrimp, common pathogenic Vibrio including Vibrio parahaemolyticus, Vibrio alginolyticus, Vibrio harveyi and so on. Vibrio is a constant bacteria in the water column, the presence of the most in the substrate, the temperature is suitable, once the lack of oxygen, water change, serious organic pollution is easy to reproduce in large quantities; shrimp specifications to grow to 4 ~ 5cm, Vibrio reaches a certain number of possible diseases.
For the prevention and control of vibriosis, the first to maintain the stability of the water body, to avoid water changes. Second, adequate feeding to avoid shrimp ingestion of large amounts of substrate, dead algae. Third, regularly test the number of Vibrio bacteria in the water column to prevent their proliferation. Fourth, adhere to the regular bottom change, to avoid serious pollution of late organic pollution. Reasonable use of fermented products to regulate the intestinal micro-ecological balance, repair the intestinal mucosa at the same time to improve the immunity of shrimp, once the occurrence of bacterial disease, you can also use disinfectants and antibacterial drugs according to the specific circumstances.
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