The affected shrimp larvae show fouling of gills, setae, appendages and body surface. Moulting is impaired and the larval shrimp may die due to hypoxia.  

CAUSE  

Filamentous bacteria such as Leucothrix mucor  

DIAGNOSIS  

Based on gross signs and symptoms and by microscopically demonstrating filamentous bacterial fouling of body surface and appendages of shrimp larvae.  

PREVENTION  

Maintain good water quality with optimal physico-chemical conditions.  

CONTROL  

0.25-1 ppm copper sulphate bath treatment for 4-6 hours.