Experimental Challenge of Chinook Salmon (Oncorhynchus tshawytscha) With Tenacibaculum maritimum and Tenacibaculum dicentrarchi Fulfils Koch's Postulates
Kumanan, Karthiga, Carson, Jeremy, Hunter, Ryan B.J., Rolton, Anne, von Ammon, Ulla, Bandaranayake, Chaya, Angelucci, Connie, Morrison, Richard N., Walker, Seumas P., Symonds, Jane E., and Hutson, Kate S. (2025) Experimental Challenge of Chinook Salmon (Oncorhynchus tshawytscha) With Tenacibaculum maritimum and Tenacibaculum dicentrarchi Fulfils Koch's Postulates. Journal of Fish Diseases, 48 (6). e14088.
|
PDF (Published Version)
- Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (4MB) | Preview |
Abstract
The bacterial skin disease tenacibaculosis, caused by Tenacibaculum species, affects numerous economically important marine fish, including salmonids. This study reports the ability of three Tenacibaculum maritimum strains, belonging to different molecular O-AGC types, and a single Tenacibaculum dicentrarchi strain to induce tenacibaculosis in farmed Chinook salmon (Oncorhynchus tshawytscha, Walbaum 1792) in Aotearoa New Zealand. Naïve Chinook salmon were exposed to T. maritimum (2 × 10<sup>8</sup> cells/mL) and T. dicentrarchi (2 × 10<sup>7</sup> cells/mL) by immersion using natural seawater. Clinical signs of tenacibaculosis were apparent in all T. maritimum strains used in the challenged fish. Of these, 100% of the fish challenged with O-AGC Type 2-1 and Type 3-2 strains became moribund, whereas only 60% of the O-AGC Type 3-0 challenged fish became moribund. Fish exposed to T. dicentrarchi showed more severe symptoms, exposing musculature in 51% of the challenged population, with 28% of fish becoming moribund. Gross pathological signs of fin rot, scale loss, skin ulcers and haemorrhagic skin spots were observed for both Tenacibaculum species and were consistent with those observed on farmed fish. Pure T. maritimum and T. dicentrarchi cultures were reisolated from epidermal damage of challenged fish. Tenacibaculum species was not isolated from the anterior kidney of affected fish, which indicates no systemic infection in Chinook salmon.
| Item ID: | 87998 |
|---|---|
| Item Type: | Article (Research - C1) |
| ISSN: | 1365-2761 |
| Keywords: | challenge model, disease causation, marine disease, pathogenicity, skin ulcer, tenacibaculosis |
| Copyright Information: | © 2025 The Author(s). Journal of Fish Diseases published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
| Date Deposited: | 17 Mar 2026 03:48 |
| FoR Codes: | 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300503 Fish pests and diseases @ 100% |
| SEO Codes: | 10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1002 Fisheries - aquaculture > 100202 Aquaculture fin fish (excl. tuna) @ 100% |
| Downloads: |
Total: 1 Last 12 Months: 1 |
| More Statistics |
Actions (Repository Staff Only)
 |
Item Control Page |