Necrosis of hematopoietic and epithelial organs

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.

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.