Red disease in shrimps is associated with high application of lime (2-6 tons/ha) in the pond that gives it a high initial pH; prolonged exposure to low salinity .
Affected shrimps have red short streaks on gills or abdominal segments, yel-lowish to reddish discoloration of the body (Fig. 6-9) and increased fluid in the cephalothorax, emitting foul odor.
EFFECTS ON HOST:
Yellow to red discoloration in affected shrimps; histopathology of the hepato-pancreas shows hemocytic infiltration in the spaces between the tubules; more advanced lesions are in the form of fibriotic and melanized encapsulation of necrotic tissues, either in the tubule itself or the sinuses around it.
PREVENTION AND CONTROL:
• Prepare pond bottom properly
• Reduce lime and organic matter content inputs