Muscle necrosis in shrimp is caused by temperature and salinity shock, low oxygen levels, overcrowding, rough handling and severe gill fouling.
Affected shrimp show opaque white areas on the abdomen (Fig. 6-3); blacken-ing on the edges of the uropod followed by erosion and liquid-filled boils at the tip of uropods in advanced stages; “wood grain” appearance of abdominal muscle in postlarvae (Fig. 6-4).
EFFECTS ON HOST:
There is a gradual death of cells of affected parts leading to erosion especially in the tail. This may then serve as portal of entry for secondary systemic bacte-rial infection.
PREVENTION AND CONTROL:
Reduce stocking density and improve water quality by daily water change (5-10%)
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