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...
Published in: | Fauna norvegica |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Norwegian University of Science and Technology (NTNU), University Museum
2016
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Online Access: | http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1954 https://doi.org/10.5324/fn.v36i0.1954 |
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ftntnutrondhojs:oai:www.ntnu.no/ojs:article/1954 2023-05-15T15:29:53+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 2016-02-24 application/pdf http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1954 https://doi.org/10.5324/fn.v36i0.1954 eng eng Norwegian University of Science and Technology (NTNU), University Museum http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1954/1964 Copyright (c) 2016 Tormod Haraldstad, Thrond Oddvar Haugen, Reidar Borgstrøm, Bror Jonsson http://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Fauna norvegica; Vol 36 (2016); 1-7 1891-5396 1502-4873 Teleostei; Atlantic salmon info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2016 ftntnutrondhojs https://doi.org/10.5324/fn.v36i0.1954 2017-08-09T19:53:05Z 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 NTNU Open Access Journals (Norwegian University of Science and Technology) Fauna norvegica 36 1 |
institution |
Open Polar |
collection |
NTNU Open Access Journals (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondhojs |
language |
English |
topic |
Teleostei; Atlantic salmon |
spellingShingle |
Teleostei; Atlantic salmon 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) |
topic_facet |
Teleostei; Atlantic salmon |
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 |
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 |
Norwegian University of Science and Technology (NTNU), University Museum |
publishDate |
2016 |
url |
http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1954 https://doi.org/10.5324/fn.v36i0.1954 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Fauna norvegica; Vol 36 (2016); 1-7 1891-5396 1502-4873 |
op_relation |
http://www.ntnu.no/ojs/index.php/fauna_norvegica/article/view/1954/1964 |
op_rights |
Copyright (c) 2016 Tormod Haraldstad, Thrond Oddvar Haugen, Reidar Borgstrøm, Bror Jonsson http://creativecommons.org/licenses/by-nc/4.0 |
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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1766360331392647168 |