The success and sustainability of Chilean aquaculture largely depends on the control of endemic and emerging pathogens, including several species of the genus Tenacibaculum. Tenacibaculum dicentrarchi and “Tenacibaculum finnmarkense” have been detected and confirmed in Chilean Atlantic salmon (Salmo salar). However, no outbreaks of tenacibaculosis in rainbow trout (Oncorhynchus mykiss) or coho salmon (Oncorhynchus kisutch) have been reported, either in Chile or globally. The aims of this study were to determine whether the mortalities recorded for rainbow trout and coho salmon from five marine fish farms located in the Los Lagos, Aysén, and Magallanes Regions could be caused by Tenacibaculum spp. The diseased fish exhibited cutaneous haemorrhages, tail and peduncle rots, and damage on the mouth and tongue. Microbiological analysis of infected external tissues yielded 13 bacterial isolates. The isolates were identified as members of the genus Tenacibaculum through biochemical analysis (e.g. Gram‐stain negative, straight rods, filamentous cells and motile by gliding), but differences existed in biochemical results, making species‐level identification through biomolecular tools essential. The 16S rRNA analysis found that the majority of isolates were more closely related to “T. finnmarkense” than T. dicentrarchi, while the phylogenetic trees resulting from multilocus sequence data recovered the four main clades (clades I to IV) identified by Olsen et al. (2017, Veterinary Microbiology, 205, 39). This is the first documented occurrence of clinical tenacibaculosis in farmed rainbow trout and coho salmon globally, and it extends the known host distribution of this pathogen in Chile. Moreover, we confirm the presence of Tenacibaculum species in the Chilean Patagonia. These findings highlight the importance of establishing preventative measures to minimize the spread of this disease within the Chilean marine aquaculture industry, as well as the need for monitoring initiatives worldwide in these farmed fish species.

中文翻译：

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新的鲑鱼寄主为Tenacibaculum物种：智利水产养殖中的tenacibaculosis扩大。

智利水产养殖的成功与可持续性在很大程度上取决于对地方性和新兴病原体（包括Tenacibaculum属的几种）的控制。已在智利大西洋鲑鱼（Salmo salar）中发现并确认了Tenacibaculum dicentrarchi和“ Tenacibaculum finnmarkense ” 。但是，无论是在智利还是在全球，都没有报告过虹鳟（Oncorhynchus mykiss）或银鲑（Oncorhynchus kisutch）暴发性球菌病的报道。这项研究的目的是确定记录在洛斯拉各斯，艾森和马加拉内斯地区的五个海水养鱼场的虹鳟鱼和银大麻哈鱼的死亡率是否可能由以下原因造成：藤杆菌属 患病的鱼表现出皮肤出血，尾巴和花梗腐烂以及口和舌头受损。感染的外部组织的微生物学分析产生了13种细菌分离株。通过生化分析（例如革兰氏阴性，直杆，丝状细胞和滑行运动），将分离物鉴定为藤杆菌属的成员，但是生化结果存在差异，因此通过生物分子工具进行物种水平的鉴定至关重要。16S rRNA分析发现，大多数分离物与T. finnmarkense的关系比T. dicentrarchi更紧密，而由多基因座序列数据产生的系统发育树恢复了Olsen等人鉴定的四个主要进化枝（进化枝I至IV）。（2017，兽医微生物学，205，39）。这是全球范围内养殖虹鳟鱼和银大麻哈鱼中首次出现的临床性腱鞘病，它扩大了该病原体在智利的已知寄主分布。此外，我们确认智利巴塔哥尼亚存在Tenacibaculum物种。这些发现强调了制定预防措施以使该疾病在智利海洋水产养殖业中的传播最小化的重要性，以及对这些养殖鱼类在全球范围内进行监测的必要性。