Affected shrimp larvae appear qpaque. The protozoeal and mysis stages are highly susceptible. Within 1-2 days, whole stock of shrimp larvae may suffer mortality.  

CAUSE  

Oomycetous fungi such as Lagenidium spp., Sirolpidium spp., and Halipthoros spp.  

DIAGNOSIS  

Microscopic demonstration of presence of extensively branched non-septate, fungal hyphae within the body cavity of the hrimp larvae.  

PREVENTION  

Clean tank bottom periodically. Disinfect the tanks and other equipment in the hatchery from time to time. Treat spawners with 5 ppm treflan bath for one hour.  

CONTROL  

Treflan (Trifluralin) 0.1-0.2 ppm bath for one day.