Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers
Young Atlantic salmon, Salmo salar , brown trout, Salmo trutta , and Arctic char, Salvelinus alpinus , from eight rivers in North and Mid Norway were examined for Gyrodactylus. The fish were collected from 1975 to 1980. A Gyrodactylus salaris type was observed infecting salmon from six of these rive...
Published in: | Journal of Fish Biology |
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1982
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1982.tb02819.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1982.tb02819.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1982.tb02819.x |
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crwiley:10.1111/j.1095-8649.1982.tb02819.x 2024-06-02T08:02:26+00:00 Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers Heggberget, T. G. Johnsen, B. O. 1982 http://dx.doi.org/10.1111/j.1095-8649.1982.tb02819.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1982.tb02819.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1982.tb02819.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 21, issue 1, page 15-26 ISSN 0022-1112 1095-8649 journal-article 1982 crwiley https://doi.org/10.1111/j.1095-8649.1982.tb02819.x 2024-05-03T11:33:24Z Young Atlantic salmon, Salmo salar , brown trout, Salmo trutta , and Arctic char, Salvelinus alpinus , from eight rivers in North and Mid Norway were examined for Gyrodactylus. The fish were collected from 1975 to 1980. A Gyrodactylus salaris type was observed infecting salmon from six of these rivers. No trout or char were infected. A high frequency and intensity of infection of salmon were observed in all but one of the rivers surveyed. In the Saltdalselva, only one specimen of Gyrodactylus infecting one fish was observed. No subsequent mortality of salmon was observed in this river while there were signs of a high mortality of salmon in the other rivers. The salmon parr were more frequently attacked than the fry, the mortality of salmon seemed to have happened in most of the rivers one year after the first observations of Gyrodactylus were made. The mortality of salmon and the high infection rate of Gyrodactylus in these rivers appears unique, and as far as known to the authors there are no other described cases of mortality due to Gyodactylus in Atlantic salmon in natural waters. The reasons for the outbreak of Gyrodactylus in these rivers are not known. Two theories are discussed: one that the fish were weakened by environmental factors and the other that Gyrodactylus was introduced from some of the infected salmon hatcheries in Scandinavia. Article in Journal/Newspaper Arctic Atlantic salmon Salmo salar Salvelinus alpinus Wiley Online Library Arctic Norway Journal of Fish Biology 21 1 15 26 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Young Atlantic salmon, Salmo salar , brown trout, Salmo trutta , and Arctic char, Salvelinus alpinus , from eight rivers in North and Mid Norway were examined for Gyrodactylus. The fish were collected from 1975 to 1980. A Gyrodactylus salaris type was observed infecting salmon from six of these rivers. No trout or char were infected. A high frequency and intensity of infection of salmon were observed in all but one of the rivers surveyed. In the Saltdalselva, only one specimen of Gyrodactylus infecting one fish was observed. No subsequent mortality of salmon was observed in this river while there were signs of a high mortality of salmon in the other rivers. The salmon parr were more frequently attacked than the fry, the mortality of salmon seemed to have happened in most of the rivers one year after the first observations of Gyrodactylus were made. The mortality of salmon and the high infection rate of Gyrodactylus in these rivers appears unique, and as far as known to the authors there are no other described cases of mortality due to Gyodactylus in Atlantic salmon in natural waters. The reasons for the outbreak of Gyrodactylus in these rivers are not known. Two theories are discussed: one that the fish were weakened by environmental factors and the other that Gyrodactylus was introduced from some of the infected salmon hatcheries in Scandinavia. |
format |
Article in Journal/Newspaper |
author |
Heggberget, T. G. Johnsen, B. O. |
spellingShingle |
Heggberget, T. G. Johnsen, B. O. Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
author_facet |
Heggberget, T. G. Johnsen, B. O. |
author_sort |
Heggberget, T. G. |
title |
Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
title_short |
Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
title_full |
Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
title_fullStr |
Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
title_full_unstemmed |
Infestations by Gyrodactylus sp. of Atlantic salmon, Salmo salar L., in Norwegian rivers |
title_sort |
infestations by gyrodactylus sp. of atlantic salmon, salmo salar l., in norwegian rivers |
publisher |
Wiley |
publishDate |
1982 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1982.tb02819.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1982.tb02819.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1982.tb02819.x |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Atlantic salmon Salmo salar Salvelinus alpinus |
genre_facet |
Arctic Atlantic salmon Salmo salar Salvelinus alpinus |
op_source |
Journal of Fish Biology volume 21, issue 1, page 15-26 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1982.tb02819.x |
container_title |
Journal of Fish Biology |
container_volume |
21 |
container_issue |
1 |
container_start_page |
15 |
op_container_end_page |
26 |
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1800746930788106240 |