Pacific lamprey (Entosphenus tridentatus) is a First Food of Native Americans. Declines in lamprey abundance due to dam construction and habitat loss have curtailed traditional harvest opportunities. Artificial propagation is an emerging recovery tool for this imperiled species, and other lamprey species in Finland and Japan. To manage disease risk at prospective lamprey hatcheries, it is critical to understand the pathogens and parasites most likely to affect lamprey and other fish, both in culture and in the wild. We assembled data from regional fish health laboratories to assess pathogen prevalence in Pacific lamprey sampled from various sources (518 adults, 275 larvae, and one juvenile). In adults, Aeromonas salmonicida was identified using standard health screening methods in 0–69% of dead lamprey samples submitted, but no other pathogens were typically observed. All larvae were negative for bacterial and viral infections, and larvae experimentally exposed to A. salmonicida showed no infection or mortality. Conspicuously absent were detailed health assessments for metamorphosed larvae (juveniles). However, external examinations of over 20,000 juveniles captured at dams on the lower Columbia River indicated that they are susceptible to fungal infection in warm water conditions (> 12 °C), which can lead to mortality. To fully evaluate the disease risk associated with lamprey culture, directed research is needed along with standardized health screenings of lamprey at all life stages. Control of A. salmonicida, the etiological agent for furunculosis, will be a top priority for Pacific lamprey use, as this was the only pathogen regularly identified in this species.

中文翻译：

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太平洋七鳃鳗 (Entosphenus tridentatus) 中病原体的发生

太平洋七鳃鳗（Entosphenus tridentatus）是美洲原住民的第一食物。由于大坝建设和栖息地丧失，七鳃鳗数量下降，减少了传统的收获机会。人工繁殖是这种濒危物种以及芬兰和日本的其他七鳃鳗物种的新兴恢复工具。为了在预期的七鳃鳗孵化场管理疾病风险，了解最有可能影响养殖和野生七鳃鳗和其他鱼类的病原体和寄生虫至关重要。我们收集了来自区域鱼类健康实验室的数据，以评估从各种来源（518 只成鱼、275 只幼鱼和 1 只幼鱼）采样的太平洋七鳃鳗的病原体流行率。在成年人中，使用标准健康筛查方法在提交的 0-69% 的死七鳃鳗样本中发现了杀鲑气单胞菌，但通常没有观察到其他病原体。所有幼虫的细菌和病毒感染均呈阴性，实验性暴露于杀鲑鱼的幼虫未显示感染或死亡。显然没有对变态幼虫（幼虫）进行详细的健康评估。然而，对在哥伦比亚河下游大坝捕获的 20,000 多只幼鱼进行的外部检查表明，它们在温水条件下 (> 12 °C) 容易受到真菌感染，这可能导致死亡。为了全面评估与七鳃鳗养殖相关的疾病风险，需要进行定向研究以及在所有生命阶段对七鳃鳗进行标准化的健康筛查。控制绦虫病病原体 A. salicida 将是太平洋七鳃鳗使用的重中之重，