Experimental Induction of Tenacibaculosis in Atlantic Salmon (<i>Salmo salar</i> L.) Using <i>Tenacibaculum maritimum</i>, <i>T. dicentrarchi</i>, and <i>T. finnmarkense</i>
There is a limited understanding of the pathogenesis of tenacibaculosis in Atlantic salmon (<i>Salmo salar</i> L.) and there are few reproducible exposure models for comparison. Atlantic salmon were exposed via bath to <i>Tenacibaculum maritimum</i>, <i>T. dicentrarchi&...
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| Auteurs principaux: | , , , |
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| Format: | article |
| Langue: | EN |
| Publié: |
MDPI AG
2021
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| Sujets: | |
| Accès en ligne: | https://doaj.org/article/03668a47f58d48098f1cc5bd8c56dbd5 |
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| Résumé: | There is a limited understanding of the pathogenesis of tenacibaculosis in Atlantic salmon (<i>Salmo salar</i> L.) and there are few reproducible exposure models for comparison. Atlantic salmon were exposed via bath to <i>Tenacibaculum maritimum</i>, <i>T. dicentrarchi</i>, or <i>T. finnmarkense,</i> and were then grouped with naïve cohabitants. Mortalities had exaggerated clinical signs of mouthrot, a presentation of tenacibaculosis characterized by epidermal ulceration and yellow plaques, on the mouth and less frequently on other tissues. Histopathology showed tissue spongiosis, erosion, ulceration, and necrosis ranging from mild to marked, locally to regionally extensive with mats of intralesional bacteria on the rostrum, vomer, gill rakers, gill filaments, and body surface. Exposure to <i>T. maritimum</i> resulted in less than a 0.4 probability of survival for both exposed and cohabitants until Day 21. Exposures to <i>T. dicentrarchi</i> resulted in 0 and 0.55 (exposed), and 0.8 and 0.9 (cohabitant) probability of survival to Day 12 post-exposure, while <i>T. finnmarkense</i> had a 0.9 probability of survival to Day 12 for all groups. This experimental infection model will be useful to further investigate the pathogenesis of tenacibaculosis, its treatment, and immunity to <i>Tenacibaculum</i> species. |
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