Institute of Marine Research, Bergen, Norway.
Department of Biological Sciences, University of Bergen, Bergen, Norway.
J Fish Dis. 2023 May;46(5):527-533. doi: 10.1111/jfd.13765. Epub 2023 Feb 7.
Mycobacterium infection in fish is a well-known disease problem globally, mainly in the farming of ornamental fish or fish for food. Less is known about the prevalence, distribution and the effects such infections have on wild fish species. Presumptive mycobacteriosis has previously been observed in Atlantic mackerel (Scomber scombrus). Since 2018, there has been an increase in reports of granulomatous kidney disease in Atlantic mackerel with the suspicion of this being mycobacteriosis. A total of six individuals were sent to the Institute of Marine Research for further examination. They were caught in the Nordic Sea by either commercial fishing vessels or during the International Ecosystem Summer Survey in the Nordic Seas (IESSNS research cruise) between 2018 and 2020. Samples for both histological and molecular analysis were collected. Here, we detect a likely novel Mycobacterium species in tissue samples from Atlantic mackerel with this condition, on the basis of rDNA and protein gene sequences. The same unnamed bacterium seems to have been found in some Pacific marine fishes. The macroscopic and histological manifestation of the disease is described. Over the past years, there has been an increase in reports of mycobacteriosis worldwide and climate change has been suggested as one of the driving forces as these bacteria prefer warm water.
鱼类分枝杆菌感染是一种全球范围内众所周知的疾病问题，主要发生在观赏鱼或食用鱼的养殖中。关于此类感染对野生鱼类物种的流行程度、分布和影响知之甚少。以前曾在大西洋鲭鱼（Scomber scombrus）中观察到疑似分枝杆菌病。自 2018 年以来，大西洋鲭鱼的肉芽肿性肾病报告有所增加，怀疑这是分枝杆菌病。共有 6 人被送往海洋研究所进一步检查。它们是在 2018 年至 2020 年期间，由商业渔船或在北欧海域国际生态系统夏季调查（IESSNS 研究巡航）期间捕获的。收集了用于组织学和分子分析的样本。在这里，我们根据 rDNA 和蛋白质基因序列，在患有这种疾病的大西洋鲭鱼的组织样本中检测到一种可能的新型分枝杆菌。在一些太平洋海洋鱼类中也发现了相同的无名细菌。描述了这种疾病的宏观和组织学表现。近年来，世界各地分枝杆菌病的报告有所增加，气候变化被认为是其中的驱动因素之一，因为这些细菌更喜欢温水。
