Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study
Methods used to monitor variation in population sizes in both Atlantic salmon and anadromous brown trout (sea trout) have been widely used in Norway the last 20 years. However, a national management regime, based on population data, has only been established for one of the two species, the Atlantic...
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ftdoajarticles:oai:doaj.org/article:f3a1cefc1b0446b7a6a146fb1a682182 2023-05-15T15:30:41+02:00 Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study Anders Lamberg Albert Kjartansson D. Imsland 2022-09-01T00:00:00Z https://doi.org/10.3390/fishes7050264 https://doaj.org/article/f3a1cefc1b0446b7a6a146fb1a682182 EN eng MDPI AG https://www.mdpi.com/2410-3888/7/5/264 https://doaj.org/toc/2410-3888 doi:10.3390/fishes7050264 2410-3888 https://doaj.org/article/f3a1cefc1b0446b7a6a146fb1a682182 Fishes, Vol 7, Iss 264, p 264 (2022) Atlantic salmon anadromous brown trout salmon farming population status anthropogenic effects Biology (General) QH301-705.5 Genetics QH426-470 article 2022 ftdoajarticles https://doi.org/10.3390/fishes7050264 2022-12-30T23:07:10Z Methods used to monitor variation in population sizes in both Atlantic salmon and anadromous brown trout (sea trout) have been widely used in Norway the last 20 years. However, a national management regime, based on population data, has only been established for one of the two species, the Atlantic salmon. One prerequisite for using this “one species” model is that there is negligible interspecific competition between salmon and trout in the rivers. This may, however, be an oversimplification of the real situation. The pre-fishery abundance (PFA), monitored with combination of underwater video systems, snorkelling counts, and catch statistics will, in most rivers, include both salmon and Sea Trout. In the present study, we estimated a total PFA for rivers, or groups of rivers, in eight regions in Norway in 2019. The total size of each river system was measured by abiotic factors such as river area, river length, annual mean water flow, and size of precipitation field; additionally, one biotic factor, smolt age, was used to standardise PFA data across regions. A comparison shows that the standardised total PFA of salmon and trout varies across regions where the highest estimated PFA was four times higher than the lowest. Compared to the traditional one-species approach, the merged PFA data show a different population status in the eight regions. The difference in the two approaches was mainly linked to the variation in size in anadromous brown trout populations. Merging data from salmon and trout populations in defined regions may be a better input in a management model than the current model used by the Norwegian Scientific Committee for Salmon Management (VRL). Article in Journal/Newspaper Atlantic salmon Directory of Open Access Journals: DOAJ Articles Norway Fishes 7 5 264 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Atlantic salmon anadromous brown trout salmon farming population status anthropogenic effects Biology (General) QH301-705.5 Genetics QH426-470 |
spellingShingle |
Atlantic salmon anadromous brown trout salmon farming population status anthropogenic effects Biology (General) QH301-705.5 Genetics QH426-470 Anders Lamberg Albert Kjartansson D. Imsland Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
topic_facet |
Atlantic salmon anadromous brown trout salmon farming population status anthropogenic effects Biology (General) QH301-705.5 Genetics QH426-470 |
description |
Methods used to monitor variation in population sizes in both Atlantic salmon and anadromous brown trout (sea trout) have been widely used in Norway the last 20 years. However, a national management regime, based on population data, has only been established for one of the two species, the Atlantic salmon. One prerequisite for using this “one species” model is that there is negligible interspecific competition between salmon and trout in the rivers. This may, however, be an oversimplification of the real situation. The pre-fishery abundance (PFA), monitored with combination of underwater video systems, snorkelling counts, and catch statistics will, in most rivers, include both salmon and Sea Trout. In the present study, we estimated a total PFA for rivers, or groups of rivers, in eight regions in Norway in 2019. The total size of each river system was measured by abiotic factors such as river area, river length, annual mean water flow, and size of precipitation field; additionally, one biotic factor, smolt age, was used to standardise PFA data across regions. A comparison shows that the standardised total PFA of salmon and trout varies across regions where the highest estimated PFA was four times higher than the lowest. Compared to the traditional one-species approach, the merged PFA data show a different population status in the eight regions. The difference in the two approaches was mainly linked to the variation in size in anadromous brown trout populations. Merging data from salmon and trout populations in defined regions may be a better input in a management model than the current model used by the Norwegian Scientific Committee for Salmon Management (VRL). |
format |
Article in Journal/Newspaper |
author |
Anders Lamberg Albert Kjartansson D. Imsland |
author_facet |
Anders Lamberg Albert Kjartansson D. Imsland |
author_sort |
Anders Lamberg |
title |
Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
title_short |
Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
title_full |
Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
title_fullStr |
Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
title_full_unstemmed |
Using Merged Pre-Fishery Abundance as a Parameter Evaluating the Status of Atlantic Salmon and Anadromous Brown Trout Populations: A Norwegian Case Study |
title_sort |
using merged pre-fishery abundance as a parameter evaluating the status of atlantic salmon and anadromous brown trout populations: a norwegian case study |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/fishes7050264 https://doaj.org/article/f3a1cefc1b0446b7a6a146fb1a682182 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Fishes, Vol 7, Iss 264, p 264 (2022) |
op_relation |
https://www.mdpi.com/2410-3888/7/5/264 https://doaj.org/toc/2410-3888 doi:10.3390/fishes7050264 2410-3888 https://doaj.org/article/f3a1cefc1b0446b7a6a146fb1a682182 |
op_doi |
https://doi.org/10.3390/fishes7050264 |
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Fishes |
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7 |
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5 |
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264 |
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1766361144459526144 |