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Applied and Environmental Microbiology, September 2000, p. 3924-3930, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Additional Evidence that Juvenile Oyster Disease Is Caused by a Member of the Roseobacter Group and Colonization of Nonaffected Animals by Stappia stellulata-Like Strains†

Katherine J. Boettcher,1,* Bruce J. Barber,2 and John T. Singer1

Department of Biochemistry, Microbiology, and Molecular Biology1 and School of Marine Sciences,2 University of Maine, Orono, Maine 04469

Received 2 May 2000/Accepted 6 July 2000

Juvenile oyster disease (JOD) causes significant annual mortalities of hatchery-produced Eastern oysters, Crassostrea virginica, cultured in the Northeast. We have reported that a novel species of the alpha -proteobacteria Roseobacter group (designated CVSP) was numerically dominant in JOD-affected animals sampled during the 1997 epizootic on the Damariscotta River, Maine. In this study we report the isolation of CVSP bacteria from JOD-affected oysters during three separate epizootics in 1998. These bacteria were not detected in nonaffected oysters at the enzootic site, nor in animals raised at a JOD-free site. Animals raised at the JOD enzootic site that were unaffected by JOD were stably and persistently colonized by Stappia stellulata-like strains. These isolates (designated M1) inhibited the growth of CVSP bacteria in a disk-diffusion assay and thus may have prevented colonization of these animals by CVSP bacteria in situ. Laboratory-maintained C. virginica injected with CVSP bacteria experienced statistically significant elevated mortalities compared to controls, and CVSP bacteria were recovered from these animals during the mortality events. Together, these results provide additional evidence that CVSP bacteria are the etiological agent of JOD. Further, there are no other descriptions of specific marine alpha -proteobacteria that have been successfully cultivated from a defined animal host. Thus, this system presents an opportunity to investigate both bacterial and host factors involved in the establishment of such associations and the role of the invertebrate host in the ecology of these marine alpha -proteobacteria.

* Corresponding author. Mailing address: Department of Biochemistry, Microbiology, and Molecular Biology, University of Maine, Orono, ME 04469. Phone: (207) 581-2822. Fax: (207) 581-2801. E-mail: boettche{at}maine.maine.edu.

dagger This is Maine Agriculture and Forestry Experiment Station Publication number 2434.

Applied and Environmental Microbiology, September 2000, p. 3924-3930, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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