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: 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.

Figure 8: White shrimps with IHHNV disease with typical signs such as curvature, anomalous tail, deformity.


Figure 9: Close-up of white shrimps with IHHNV disease card. White shrimps show IHHNV disease, deformed shrimps stems


Figure 10: White leg shrimp presents with IHHNV disease, deformed shrimp stems, anomalies.

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.