Loose shell syndrome in vannamei...

Hello everyone: 
         Today we will see about loose shell syndrome in vannamei...
 Due to increased production, adaptation of various technology, high stocking density, improper management leads to origin of new disease in shrimp farming industry.
   
What is it?
          Before that, you must be clear about moulting cycle of shrimp. 
          In this syndrome, there is gap present between muscle and shell and also shells looks like paper in structure. If you touch the exoskeleton, it is very soft. Muscles also so soft.

       Sometimes after moulting, the shrimp get hardens it's shell. This happened within few hours. At stage of after moulting, the body looks so soft. So don't confused with that.

       The affected shrimp shows reduced growth rate. The affected shrimp lost its weight...

What is the main reason?
          We can't tell the correct reason for this occurance. But we can tell certain situations can cause this type of syndrome. The first and foremost thing is water quality...

                         Improper water quality
                      Improper selection of feed
              Some of nutritional deficiency in feed
                           Harmful pathogens
                      Improper pond preparation
             Presence of fouling organism in pond
                Improper application of minerals

These are the some of the reason for the occurance of this disease. Minerals requirements also very important.

Affected shrimp :
              Affected shrimp shows fouling of protozoans on pleopods and gills. The gills get heavily damaged and shows brown in colour and presence of fouling organism. It denotes improper pond bottom management.
              Vibrio present in all the conditions. If your shrimp got stressed then vibrio found. In this situation also vibrio found.
              The shells of shrimp is very thin and paper like structure. It is not got attached to the muscle. There is a gap between shell and muscle. It is due to the muscular dystrophy. The hepatopancreas get shrunken.

              The hepatopancreas get affected, so the cells present in the hepatopancreas get inflammated and leads to destruction of cells. Due to this , the shrimp can't get digest and store the nutrients in the body. So the affected animal looks always empty gut and weight also reduced.

                 This syndrome will affect the survival of the shrimp. Some of toxic diatoms species also majorly observed in the affected pond. 
   
These are the some of the sign this syndrome. We have to properly prepare the aged ponds. Proper use of probiotics will leads to better bottom management. Try to maintain optimum dissolved oxygen level in your pond.

       Nowadays, many persons facing some of the issues in aged ponds. Turbidity also occurs. How to prevent this Turbidity in loose soils.
1. How to strengthen the soil before stocking.
2. What are things to do for this type of soils.
3. Is periphyton based farming can help for this system?
4. Effect of nitrifiers in substrates based farming.
      The answer for these questions will be posted on next blog... For more info .  Contact me...
                       Thank you 😊.

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