Abstract

• Macrobrachium rosenbergii nodavirus (MrNV) is a pathogen of giant freshwater prawns that causes white tail disease (WTD). It leads to high economic losses in hatcheries and farms of freshwater shrimp culture area across the world. In the present study, two prawns hatcheries: Twantay and Htantabin hatcheries located at Yangon Division were selected as a study sides and to examine the distribution Macrobrachium rosenbergii nodavirus (MrNV) in different life stages of Macrobrachium rosenbergii using RT-PCR and RT-nested PCR (nRT-PCR). Negative results were record in all life stages of Macrobrachium rosenbergii from Htantabin hatchery. However, different life stages broodstocks, post-larvae and juveniles of M. rosenbergii showed positive in nRT-PCR at Twantay hatchery. The result in the present study indicated that MrNV has been introduced to Twantay hatchery through the broodstocks.