Health Monitoring of Invasive Pink Salmon Oncorhynchus gorbuscha in Norway in 2023

IF 1.9 Q3 FISHERIES
Åse Helen Garseth, Lisa Furnesvik, Kristoffer Vale Nielsen, Anne Berit Olsen, Julie Christine Svendsen, Torfinn Moldal
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Abstract

Since 2019, the Norwegian Veterinary Institute (NVI) has conducted health monitoring of pink salmon in Norway. The primary purpose of health monitoring has been to examine the presence of selected notifiable infections in pink salmon, but also to gain general knowledge regarding the health of pink salmon to inform assessments of risks to wild and farmed native salmonids. In 2023, post-mortem examinations were performed on 184 pink salmon captured in rivers Lakselv, Tana, Neiden, Komagelva, Kongsfjordelva and Karpelv in the County of Finnmark, Norway. Tissue samples from 161 of these were analysed with specific PCR assays aimed at detecting infectious salmon anaemia virus (ISAV), viral haemorrhagic septicaemia virus (VHSV), infectious hematopoietic necrosis virus (IHNV), piscine orthoreovirus genotype 1 (PRV-1) and Renibacterium salmoninarum. In addition, cultivation methods were applied to detect the presence of cultivable virus and bacteria. ISAV, VHSV, IHNV PRV-1 and R. salmoninarum were not detected by PCR. Furthermore, R. salmoninarum, Aeromonas salmonicida subsp. salmonicida and cultivable virus were not detected by cultivation. With the exception of the absence of PRV-1, the results correspond to previous years' health-monitoring projects.

Abstract Image

2023年挪威入侵粉红鲑健康监测
自2019年以来,挪威兽医研究所(NVI)在挪威对粉红鲑鱼进行了健康监测。健康监测的主要目的是检查粉红鲑鱼中是否存在选定的应报告感染,但也要获得关于粉红鲑鱼健康的一般知识,以便为评估野生和养殖的本地鲑鱼的风险提供信息。2023年,对在挪威芬马克县的Lakselv、Tana、Neiden、Komagelva、Kongsfjordelva和Karpelv河捕获的184条粉鲑鱼进行了尸检。对其中161条鱼的组织样本进行了特异性PCR分析,目的是检测传染性鲑鱼贫血病毒(ISAV)、病毒性出血性败血症病毒(VHSV)、传染性造血坏死病毒(IHNV)、鱼类正呼肠孤病毒基因型1 (PRV-1)和鲑科沙门氏菌。此外,采用培养方法检测可培养病毒和细菌的存在。PCR未检出ISAV、VHSV、IHNV PRV-1和沙门氏菌。此外,沙门氏菌,沙门氏气单胞菌亚种。培养未检出沙门氏菌和可培养病毒。除没有PRV-1外,结果与前几年的健康监测项目相符。
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