The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms
Abstract The introduced salmonid ectoparasite Gyrodactylus salaris has been detected on Atlantic salmon in 53 Norwegian rivers and in 39 Norwegian fish farms. In affected rivers, the mortality of Atlantic salmon juveniles is very high, estimated to a mean of 86%. G. salaris has been considered one o...
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Online Access: | http://dx.doi.org/10.1111/jfd.13981 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.13981 |
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crwiley:10.1111/jfd.13981 2024-09-15T17:55:48+00:00 The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms Mo, Tor Atle 2024 http://dx.doi.org/10.1111/jfd.13981 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.13981 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Fish Diseases volume 47, issue 9 ISSN 0140-7775 1365-2761 journal-article 2024 crwiley https://doi.org/10.1111/jfd.13981 2024-08-27T04:27:24Z Abstract The introduced salmonid ectoparasite Gyrodactylus salaris has been detected on Atlantic salmon in 53 Norwegian rivers and in 39 Norwegian fish farms. In affected rivers, the mortality of Atlantic salmon juveniles is very high, estimated to a mean of 86%. G. salaris has been considered one of the biggest threats to wild Norwegian Atlantic salmon stocks. With various measures, the authorities have reduced the potential for further spread of the parasite to new rivers and fish farms, and G. salaris has been eradicated from 43 rivers and all fish farms. Furthermore, the eradication process is almost completed in five affected rivers located at the Norwegian west coast, while preparations for the eradication in the remaining five rivers in the southeastern part of Norway have begun. The goal of Norwegian management is to eradicate the introduced pathogenic G. salaris strains from all occurrences in Norway. In fish farms, the parasite has been removed by mandatory slaughter of infected fish. In rivers, G. salaris has mostly been removed by killing all the fish hosts with rotenone. The indigenous genetic Atlantic salmon stocks are re‐established after eradication of the parasite. New methods are developed using chemicals that kill the parasite without killing fish in the rivers. Norwegian authorities have so far used more than NOK 1.5 billion on research, monitoring and combating G. salaris . However, the benefits are considered many times greater than the spending. Without control measures, G. salaris would likely have spread to new Atlantic salmon rivers where the same catastrophic outcome had to be expected. The Norwegian authorities seem to meet the goal in their long‐term work to halt the spread of G. salaris and to eradicate the parasite in affected rivers. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Journal of Fish Diseases 47 9 |
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Abstract The introduced salmonid ectoparasite Gyrodactylus salaris has been detected on Atlantic salmon in 53 Norwegian rivers and in 39 Norwegian fish farms. In affected rivers, the mortality of Atlantic salmon juveniles is very high, estimated to a mean of 86%. G. salaris has been considered one of the biggest threats to wild Norwegian Atlantic salmon stocks. With various measures, the authorities have reduced the potential for further spread of the parasite to new rivers and fish farms, and G. salaris has been eradicated from 43 rivers and all fish farms. Furthermore, the eradication process is almost completed in five affected rivers located at the Norwegian west coast, while preparations for the eradication in the remaining five rivers in the southeastern part of Norway have begun. The goal of Norwegian management is to eradicate the introduced pathogenic G. salaris strains from all occurrences in Norway. In fish farms, the parasite has been removed by mandatory slaughter of infected fish. In rivers, G. salaris has mostly been removed by killing all the fish hosts with rotenone. The indigenous genetic Atlantic salmon stocks are re‐established after eradication of the parasite. New methods are developed using chemicals that kill the parasite without killing fish in the rivers. Norwegian authorities have so far used more than NOK 1.5 billion on research, monitoring and combating G. salaris . However, the benefits are considered many times greater than the spending. Without control measures, G. salaris would likely have spread to new Atlantic salmon rivers where the same catastrophic outcome had to be expected. The Norwegian authorities seem to meet the goal in their long‐term work to halt the spread of G. salaris and to eradicate the parasite in affected rivers. |
format |
Article in Journal/Newspaper |
author |
Mo, Tor Atle |
spellingShingle |
Mo, Tor Atle The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
author_facet |
Mo, Tor Atle |
author_sort |
Mo, Tor Atle |
title |
The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
title_short |
The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
title_full |
The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
title_fullStr |
The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
title_full_unstemmed |
The battle against the introduced pathogenic monogenean Gyrodactylus salaris in Norwegian Atlantic salmon rivers and fish farms |
title_sort |
battle against the introduced pathogenic monogenean gyrodactylus salaris in norwegian atlantic salmon rivers and fish farms |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1111/jfd.13981 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.13981 |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Journal of Fish Diseases volume 47, issue 9 ISSN 0140-7775 1365-2761 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/jfd.13981 |
container_title |
Journal of Fish Diseases |
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47 |
container_issue |
9 |
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1810432023056089088 |