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Fish diseases
Enteric redmouth disease in rainbow trout: an affair of the heart?
  1. John McArdle
  1. 119 Park Drive Avenue, Castleknock, Dublin 15, Ireland
  1. e-mail: mcardlej{at}

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ENTERIC redmouth disease (ERM) is a serious haemorrhagic septicaemia of farmed rainbow trout (Oncorhynchus mykiss) caused by Yersinia ruckeri, a member of the Enterobacteriaceae. Seventeen outbreaks, including recrudescences, of ERM in Ireland, which I investigated between 2001 and 2014, revealed obvious heart pathology in every case.

Disease diagnosis was based on clinical signs, isolation and identification of Y ruckeri in pure culture from affected fish and histopathological samples. Various organs from approximately six to eight fish per case were fixed in formalin and processed to produce haematoxylin and eosin-stained sections.

Affected fish were lethargic, dark and …

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