SIGNS AND SYMPTOMS
Shrimps lethargic with surface and gill fouling.
The virus affect all life stages. Disease severe in postlarvae and senescent
adults. High cumulative mortalities.
CAUSE
Type A baculovirus
DIAGNOSIS
Tentative diagnosed by microscopic demonstration
of single or multiple spherical intranuclear occlusion bodies in fresh
squash preparation of hepatopancreas under phase contrast microscope or
by staining with 0.1% malachite green (darkly stained intranuclear occlusion
bodies.) Confirmed by demonstration of characteristic single or multiple
oval eosinophilic intranuclear occulsions with associated histopathology
by hematoxylene and eosine (H & E) staining.
PREVENTION
Use MBV-free stock for culture purpose. MBV
infections are tolerated by P. monodon until the environment conditions
are not hostile. Hence, it is essential to maintain good water quality
by increased water exchange in order to minimise risks of secondary bacterial
infections cumulatively leading to mortality.
CONTROL
Not known. Destroy affected shrimp by burning
or burying them after mixing with lime away from the culture facility |
