Shrimp Disease: Disease Yellowhead
Shrimp Disease: Disease Yellowhead
Cause: Yellow Head Virus (YHD), corona-like RNA virus (genus Okavirus, family Ronaviridae and the order Nidovirales)
Bio - Ecology of Pathogens:
• Krustase sensitive to infection with this virus include: Penaeus monodon, P. merguensis, P. semisulcatus, Metapenaeus ensis, Litopenaeus vannamei, etc..
• Shrimp black tiger shrimp is a very sensitive species, in acute cases can result in the death of up to 100% within 3.5 days since the first clinical symptoms appear.
• Transmission occurs horizontally through the water shrimp or cannibalism to feed a sick or infected.
• Post larvae (PL) shrimp aged <15 days relative resisters against infection with this virus compared with 20-25 days old PL or juveniles.
• The molecular (DNA sequencing) from products of reverse-transcription polymerase chain reaction (RT-PCR) of yellow head virus have similarities to the gill-associated virus (Gav), although different species or strains.
Clinical Sympto