Cause
Epithelial and hematopoietic necrosis caused by infectious hypodermal and hematopoietic necrosis virus (IHHNV). IHHNV is classified in the family Parvoviridae, of the new breed Brevidensovirus.
Diagnosis
Diagnosis: The infected white leg shrimp presented a curved or anomalous host, the appendages in the head of the breast also appeared abnormal, deformed, rough and scaly shells, crayfish beard, shrimp growth decreased from 10 to 30%, shrimp were stunted. For prawns, when they show disease, the shrimp usually turn blue, the abdominal muscles are cloudy white and the shrimp often die a lot in the period of 10 – 20 days after breeding. IHHNV disease reduces production and causes economic damage because when harvested, infected shrimp are often small, uneven and anomalous in size.
![](https://rexil-asia.com/wp-content/uploads/2022/04/tong-quan-9.png)
![](https://rexil-asia.com/wp-content/uploads/2022/04/tong-quan-10-640x341-1.png)
![](https://rexil-asia.com/wp-content/uploads/2022/04/tong-quan-11-640x413-1.png)
Preventing and treating diseases
The most effective way to prevent diseases is still to use clean, high-quality shrimp. Egg and larval sterilization is an effective method of disease prevention at breeding farms. For meat shrimp ponds, selecting and checking healthy, clean and non-infectious breeds, IHHNV infection is also a way to prevent disease.