Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions
Abstract Selective breeding plays a vital role in the production of farmed Atlantic salmon and has shown success in many aspects. Still, challenges related to fish health and welfare continue to result in significant economic losses. One such challenge is red and melanized focal changes (RFC/MFC), w...
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crwiley:10.1111/jfd.13856 2024-09-30T14:32:17+00:00 Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions Brimsholm, Malin Fjelldal, Per Gunnar Hansen, Tom Fraser, Thomas Kenneth William Solberg, Monica Glover, Kevin Koppang, Erling Olaf Bjørgen, Håvard 2023 http://dx.doi.org/10.1111/jfd.13856 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.13856 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Fish Diseases volume 46, issue 12, page 1377-1389 ISSN 0140-7775 1365-2761 journal-article 2023 crwiley https://doi.org/10.1111/jfd.13856 2024-09-17T04:49:09Z Abstract Selective breeding plays a vital role in the production of farmed Atlantic salmon and has shown success in many aspects. Still, challenges related to fish health and welfare continue to result in significant economic losses. One such challenge is red and melanized focal changes (RFC/MFC), which result from acute and chronic inflammation, respectively, in the skeletal muscle. Importantly, RFC/MFC has not been observed in wild Atlantic salmon, suggesting that both external and genetic factors may contribute to the development of inflammation. To investigate the underlying cause of RFC/MFC, we conducted a study involving 1854 Atlantic salmon of farmed, wild and hybrid origin. All fish were reared under identical conditions to minimize the influence of external factors. Throughout the production cycle, the fish was monitored for growth parameters and examined for RFC/MFC using macroscopic and histological analysis. We found no association between the experimental groups and the presence of RFC/MFC. Histological investigations revealed melano‐macrophages in the soft tissue in freshwater smolt, although no macroscopic discoloration was observed. MFC showed granulomas in various stages, suggesting a complex progression of the condition. In summary, we conclude that RFC/MFC is primarily caused by external factors found in the rearing facilities of farmed Atlantic salmon. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Journal of Fish Diseases 46 12 1377 1389 |
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Abstract Selective breeding plays a vital role in the production of farmed Atlantic salmon and has shown success in many aspects. Still, challenges related to fish health and welfare continue to result in significant economic losses. One such challenge is red and melanized focal changes (RFC/MFC), which result from acute and chronic inflammation, respectively, in the skeletal muscle. Importantly, RFC/MFC has not been observed in wild Atlantic salmon, suggesting that both external and genetic factors may contribute to the development of inflammation. To investigate the underlying cause of RFC/MFC, we conducted a study involving 1854 Atlantic salmon of farmed, wild and hybrid origin. All fish were reared under identical conditions to minimize the influence of external factors. Throughout the production cycle, the fish was monitored for growth parameters and examined for RFC/MFC using macroscopic and histological analysis. We found no association between the experimental groups and the presence of RFC/MFC. Histological investigations revealed melano‐macrophages in the soft tissue in freshwater smolt, although no macroscopic discoloration was observed. MFC showed granulomas in various stages, suggesting a complex progression of the condition. In summary, we conclude that RFC/MFC is primarily caused by external factors found in the rearing facilities of farmed Atlantic salmon. |
format |
Article in Journal/Newspaper |
author |
Brimsholm, Malin Fjelldal, Per Gunnar Hansen, Tom Fraser, Thomas Kenneth William Solberg, Monica Glover, Kevin Koppang, Erling Olaf Bjørgen, Håvard |
spellingShingle |
Brimsholm, Malin Fjelldal, Per Gunnar Hansen, Tom Fraser, Thomas Kenneth William Solberg, Monica Glover, Kevin Koppang, Erling Olaf Bjørgen, Håvard Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
author_facet |
Brimsholm, Malin Fjelldal, Per Gunnar Hansen, Tom Fraser, Thomas Kenneth William Solberg, Monica Glover, Kevin Koppang, Erling Olaf Bjørgen, Håvard |
author_sort |
Brimsholm, Malin |
title |
Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
title_short |
Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
title_full |
Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
title_fullStr |
Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
title_full_unstemmed |
Red and melanized focal changes in white skeletal muscle in Atlantic salmon ( Salmo salar): Comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
title_sort |
red and melanized focal changes in white skeletal muscle in atlantic salmon ( salmo salar): comparative analysis of farmed, wild and hybrid fish reared under identical conditions |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/jfd.13856 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.13856 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Diseases volume 46, issue 12, page 1377-1389 ISSN 0140-7775 1365-2761 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/jfd.13856 |
container_title |
Journal of Fish Diseases |
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46 |
container_issue |
12 |
container_start_page |
1377 |
op_container_end_page |
1389 |
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1811636482823159808 |