DAO 116:243-249 (2015)  -  DOI: https://doi.org/10.3354/dao02920

NOTE
Analysis of Yersinia ruckeri strains isolated from trout farms in northwest Germany

Yidan Huang1, Arne Jung2, Werner-Johannes Schäfer3, Dieter Mock3, Geovana Brenner Michael4, Martin Runge5, Stefan Schwarz4, Dieter Steinhagen1,*

1Fish Disease Research Unit, University of Veterinary Medicine Hannover, Bünteweg 17, 30559 Hannover, Germany
2Clinic for Poultry, University of Veterinary Medicine Hannover, Bünteweg 17, 30559 Hannover, Germany
3Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen (LANUV), Fisheries Ecology, Heinsberger Straße 53, 57399 Kirchhundem-Albaum, Germany
4Institute of Farm Animal Genetics, Friedrich-Loeffler-Institut (FLI), Höltystr. 10, 31535 Neustadt-Mariensee, Germany
5Lower Saxony State Office for Consumer Protection and Food Safety (LAVES), Food and Veterinary Institute Braunschweig/Hannover, Eintrachtweg 17, 30173 Hannover, Germany
*Corresponding author:

ABSTRACT: Enteric redmouth disease (ERM), caused by Yersinia ruckeri, is among the most important infectious diseases in rainbow trout Oncorhynchus mykiss aquaculture in Europe. Our aim was to analyse the persistence of Y. ruckeri strains in trout farms in northwest Germany and their dissemination between farms based on a detailed molecular and phenotypical characterisation scheme. The data on identification and characterisation of Y. ruckeri strains and examining the distribution of these strains in the field could serve as a basis for preventive disease monitoring plans. During the observation period from June 2011 until June 2012, we collected 48 Y. ruckeri isolates from 12 different rainbow trout hatcheries. In total, 44 (91.7%) of the isolates were non-motile; in particular, all isolates recovered during the sampling period in winter and early spring were non-motile. In several trout farms, characteristic farm-specific Y. ruckeri isolates from particular typing groups were isolated throughout the year, while in other farms, which had a trading relationship between each other, ERM outbreaks were caused by Y. ruckeri from the same typing group. Our data indicate that in some farms, the causative Y. ruckeri strains persisted in the respective trout farm. The presence of Y. ruckeri from the same typing group in farms with a trading relationship indicates a dissemination of the infection between the farms.


KEY WORDS: Epidemiology · Enteric redmouth disease · Rainbow trout · Oncorhynchus mykiss


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Cite this article as: Huang Y, Jung A, Schäfer WJ, Mock D and others (2015) Analysis of Yersinia ruckeri strains isolated from trout farms in northwest Germany. Dis Aquat Org 116:243-249. https://doi.org/10.3354/dao02920

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