Environmental distribution and persistence of Quahog Parasite Unknown (QPX)
Gast, Rebecca J.
Moran, Dawn M.
Lyons, M. Maille
Reece, Kimberly S.
Leavitt, Dale F.
Smolowitz, Roxanna M.
MetadataShow full item record
Quahog Parasite Unknown (QPX) is the cause of mass mortality events of hard clams Mercenaria mercenaria from Virginia, USA, to New Brunswick, Canada. Aquaculture areas in Massachusetts, USA, have been particularly hard hit. The parasite has been shown to be a directly infective organism, but it is unclear whether it could exist or persist outside of its clam host. We used molecular methods to examine water, sediment, seaweeds, seagrass and various invertebrates for the presence of QPX. Sites in Virginia and Massachusetts were selected based upon the incidence of QPX-induced clam die-offs, and they were monitored seasonally. QPX was detectable in almost all of our different sample types from Massachusetts, indicating that the parasite was widely distributed in the environment. Significantly more samples from Massachusetts were positive than from Virginia, and there was a seasonal pattern to the types of samples positive from Massachusetts. The data suggest that, although it may be difficult to completely eradicate QPX from the environment, it may be possible to keep the incidence of disease under control through good plot husbandry and the removal of infected and dying clams.
Author Posting. © Inter-Research, 2008. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Diseases of Aquatic Organisms 81 (2008): 219-229, doi:10.3354/dao01948.
Suggested CitationArticle: Gast, Rebecca J., Moran, Dawn M., Audemard, Corinne, Lyons, M. Maille, DeFaveri, Jacquelin, Reece, Kimberly S., Leavitt, Dale F., Smolowitz, Roxanna M., "Environmental distribution and persistence of Quahog Parasite Unknown (QPX)", Diseases of Aquatic Organisms 81 (2008): 219-229, DOI:10.3354/dao01948, https://hdl.handle.net/1912/5848
Showing items related by title, author, creator and subject.
Epizootiology of Quahog Parasite Unknown (QPX) disease in northern quahogs (=hard clams) Mercenaria mercenaria Lyons, M. Maille; Smolowitz, Roxanna M.; Gomez-Chiarri, Marta; Ward, J. Evan (National Shellfisheries Association, 2007-08)The economically important marine bivalve mollusc, Mercenaria mercenaria, (commonly called a northern quahog or hard clam), has endured considerable mortalities caused by a thraustochytrid pathogen called Quahog Parasite ...
Gast, Rebecca J.; Cushman, E.; Moran, Dawn M.; Uhlinger, Kevin R.; Leavitt, Dale F.; Smolowitz, Roxanna M. (Inter-Research, 2006-06-12)Quahog Parasite Unknown (QPX) is a significant cause of hard clam Mercenaria mercenaria mortality along the northeast coast of the United States. It infects both wild and cultured clams, often annually in plots that are ...
Development of a real time quantitative PCR assay for the hard clam pathogen Quahog Parasite Unknown (QPX) Lyons, M. Maille; Smolowitz, Roxanna M.; Dungan, Christopher F.; Roberts, Steven B. (Inter-Research, 2006-09-14)Quahog Parasite Unknown (QPX) is a thraustochytrid pathogen responsible for catastrophic mortalities of the northern quahog (hard clam) Mercenaria mercenaria. A real-time quantitative polymerase chain reaction (qPCR) assay ...