ABSTRACT: Flavobacterium species cause significant disease in salmonid farming worldwide, typically seen as mortality in sac fry and later as necrosis and ulceration in fingerlings and fry. In this study, we sampled Atlantic salmon Salmo salar and Arctic char Salvelinus alpinus from 5 Icelandic fish farms in 2014 and 2017, where flavobacteria were suspected to cause disease. The objective of the study was to identify and characterise the bacteria by sequencing the 16S rRNA gene and multilocus sequence type housekeeping genes. We found 5 distinct groups of flavobacteria: 3 that were homogeneous and appeared to persist in the fish farms between 2014 and 2017 and 2 that were heterogeneous and transient. Flavobacterium psychrophilum could be isolated from diseased Arctic char from all 5 fish farms in both 2014 and 2017. However, while the other 4 Flavobacterium sp. groups were isolated from Atlantic salmon, water and roe, F. psychrophilum could not be isolated from these samples. This indicates that flavobacteria other than F. psychrophilum may be the primary cause of fin and tail rot in Icelandic Atlantic salmon fry.

中文翻译：

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冰岛鲑鱼养殖场中黄杆菌种类的纵向调查。

摘要：黄杆菌属物种在全世界的鲑鱼养殖中引起重大疾病，通常被视为囊苗的死亡率，后来被视为鱼苗和鱼苗的坏死和溃疡。在这项研究中，我们从2014年和2017年的5个冰岛鱼类养殖场采样了大西洋鲑Salmo salar和Arctic char salvelinus alpinus，其中怀疑黄素细菌会引起疾病。该研究的目的是通过对16S rRNA基因和多基因座序列类型持家基因进行测序来鉴定和表征细菌。我们发现了5个不同的黄细菌群：3个是同质的，似乎在2014年至2017年间在鱼类养殖场中持续存在，另外2个是异质的和短暂的。嗜黄杆菌可以在2014年和2017年从所有5个养鱼场的患病北极炭中分离出来。然而，另外4个黄杆菌属 这些组是从大西洋鲑鱼，水和卵子中分离出来的，因此无法从这些样品中分离出嗜热镰刀菌。这表明，除了嗜热镰刀菌以外的黄细菌可能是冰岛大西洋鲑鱼鱼鳍和尾腐烂的主要原因。