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Effects of fish size and route of infection on virulence of a Danish Yersinia ruckeri O1 biotype 2 strain in rainbow trout (Oncorhynchus mykiss)

Ohtani, M, Villumsen, KR, Strom, HK, Lauritsen, AH, Aalbaek, B, Dalsgaard, I, Nowak, B ORCID: 0000-0002-0347-643X, Raida, MK and Bojesen, AM 2019 , 'Effects of fish size and route of infection on virulence of a Danish Yersinia ruckeri O1 biotype 2 strain in rainbow trout (Oncorhynchus mykiss)' , Aquaculture, vol. 503 , pp. 519-526 , doi: 10.1016/j.aquaculture.2019.01.041.

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The comparative virulence of Yersinia ruckeri serotype O1 biotype 2 strain 07111224 from a Danish outbreak ofenteric redmouth disease in rainbow trout (Oncorhynchus mykiss) was investigated in different sizes of rainbowtrout (5, 19, 25 and 52 g) using a panel of challenge methods (bath, intraperitoneal (IP) injection, anal intubationand cohabitation). The results show that Y. ruckeri 07111224 is virulent enough to successfully cause mortality in 5–52 grainbow trout through three different infection routes (bath, IP injection and anal intubation), and stronglysuggests that susceptibility to Y. ruckeri infection is dependent on fish size. Bath challenge (108 CFU/ml) caused79% mortality in 5 g fish, while the mortality in 19–52 g fish was approximately 26%. IP injection challenges(105–106 CFU/individual) resulted in high mortalites in fish of all sizes. Anal intubation challenges (109 CFU/individual) induced 82% mortality in 5 g fish and decreased with increasing fish weight. Finally, cohabitationchallenges induced 45% mortality in 5 g test fish when test fish were cohabitated 1:1 with shedder fish, whilemortalities in test fish of five other challenge groups were lower (5–25%). Statistical models were fit to the datafrom each challenge model. The model parameter predictions suggests statistically significant effects of fishweight for bath, IP and anal intubation challenges. Furthermore, they highlight the importance of the ratio ofshedders to test fish in cohabitation challenges and of the challenge doses, in particular for the IP challengemodel.

Item Type: Article
Authors/Creators:Ohtani, M and Villumsen, KR and Strom, HK and Lauritsen, AH and Aalbaek, B and Dalsgaard, I and Nowak, B and Raida, MK and Bojesen, AM
Keywords: Yersinia ruckeri O1 biotype 2, bath, Intraperitoneal injection, anal intubation, cohabitation
Journal or Publication Title: Aquaculture
Publisher: Elsevier Science Bv
ISSN: 0044-8486
DOI / ID Number: 10.1016/j.aquaculture.2019.01.041
Copyright Information:

© 2019 Published by Elsevier B.V.

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