The tips of walking legs, swimmerets and uropods undergo necrosis and become brownish black. The setae, antennae and appendages may be broken and melanized.  

CAUSE  

The epibiotic bacteria such as Vibrio spp., Pseudomonas spp., Aeromonas spp. and Flavobacterium spp.  

DIAGNOSSIS  

Based on gross signs and symptoms  

PREVENTION  

Maintain good water qaulity. Stock at optimum density. Avoid unnecessary handling of the shrimps, which may lead to injuries and necrosis.  

CONTROL  

Induce moulting by applying 5-10 ppm teaseed cake.