Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar)
The precision of growth estimates based on fish scales often remains uncertain because of withinindividual variation in scale size and scale patterns, and also due to measurement errors. Based on scale readings of Atlantic salmon, we show that errors decreased with number of times and number of scal...
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Language: | English |
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Online Access: | http://hdl.handle.net/11250/2491232 https://doi.org/10.5324/fn.v36i0.1954 |
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ftnorskinstvf:oai:niva.brage.unit.no:11250/2491232 2023-05-15T15:30:48+02:00 Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) Haraldstad, Tormod Haugen, Thrond Oddvar Borgstrøm, Reidar Jonsson, Bror 2016-07-20T12:16:16Z application/pdf http://hdl.handle.net/11250/2491232 https://doi.org/10.5324/fn.v36i0.1954 eng eng NTNU Open Access Journals Fauna norvegica. 2016, 36. urn:issn:1891-5396 http://hdl.handle.net/11250/2491232 https://doi.org/10.5324/fn.v36i0.1954 cristin:1340041 Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no CC-BY-NC 7 36 Fauna norvegica Journal article Peer reviewed 2016 ftnorskinstvf https://doi.org/10.5324/fn.v36i0.1954 2023-02-21T08:45:17Z The precision of growth estimates based on fish scales often remains uncertain because of withinindividual variation in scale size and scale patterns, and also due to measurement errors. Based on scale readings of Atlantic salmon, we show that errors decreased with number of times and number of scales read per fish. The annual number of scale circuli was not constant, but positively correlated with annual specific growth rates. Number of circuli deposited after the last winter correlated positively with sampling date. There was no significant relationship between mean inter-circuli distance and the total circuli number during the first and second year at sea. For growth estimation in scientific studies, we recommend the use of 4-5 scales per fish. Consideration should be given to both circuli number and inter-circuli distances when estimating growth rate instead of relying on inter-circuli distances only. Article in Journal/Newspaper Atlantic salmon Salmo salar Norwegian Institute for Water research: NIVA Open Access Archive (Brage) Fauna norvegica 36 1 |
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Open Polar |
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Norwegian Institute for Water research: NIVA Open Access Archive (Brage) |
op_collection_id |
ftnorskinstvf |
language |
English |
description |
The precision of growth estimates based on fish scales often remains uncertain because of withinindividual variation in scale size and scale patterns, and also due to measurement errors. Based on scale readings of Atlantic salmon, we show that errors decreased with number of times and number of scales read per fish. The annual number of scale circuli was not constant, but positively correlated with annual specific growth rates. Number of circuli deposited after the last winter correlated positively with sampling date. There was no significant relationship between mean inter-circuli distance and the total circuli number during the first and second year at sea. For growth estimation in scientific studies, we recommend the use of 4-5 scales per fish. Consideration should be given to both circuli number and inter-circuli distances when estimating growth rate instead of relying on inter-circuli distances only. |
format |
Article in Journal/Newspaper |
author |
Haraldstad, Tormod Haugen, Thrond Oddvar Borgstrøm, Reidar Jonsson, Bror |
spellingShingle |
Haraldstad, Tormod Haugen, Thrond Oddvar Borgstrøm, Reidar Jonsson, Bror Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
author_facet |
Haraldstad, Tormod Haugen, Thrond Oddvar Borgstrøm, Reidar Jonsson, Bror |
author_sort |
Haraldstad, Tormod |
title |
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
title_short |
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
title_full |
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
title_fullStr |
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
title_full_unstemmed |
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar) |
title_sort |
increased precision of growth data gained by reading multiple scales from each individual of atlantic salmon (salmo salar) |
publisher |
NTNU Open Access Journals |
publishDate |
2016 |
url |
http://hdl.handle.net/11250/2491232 https://doi.org/10.5324/fn.v36i0.1954 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
7 36 Fauna norvegica |
op_relation |
Fauna norvegica. 2016, 36. urn:issn:1891-5396 http://hdl.handle.net/11250/2491232 https://doi.org/10.5324/fn.v36i0.1954 cristin:1340041 |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.5324/fn.v36i0.1954 |
container_title |
Fauna norvegica |
container_volume |
36 |
container_start_page |
1 |
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1766361272613339136 |