Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals
Traditional age reading is a rather subjective method that lacks true reproducibility, producing ageing error that propagates up to stock assessment. One alternative is represented by the use of otolith morphometrics as a predictor of age. An important issue with such a method is that it requires kn...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f08-143 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-143 |
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crcansciencepubl:10.1139/f08-143 2024-09-15T17:55:24+00:00 Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals Doering-Arjes, P. Cardinale, M. Mosegaard, H. 2008 http://dx.doi.org/10.1139/f08-143 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-143 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 11, page 2342-2350 ISSN 0706-652X 1205-7533 journal-article 2008 crcansciencepubl https://doi.org/10.1139/f08-143 2024-08-01T04:10:03Z Traditional age reading is a rather subjective method that lacks true reproducibility, producing ageing error that propagates up to stock assessment. One alternative is represented by the use of otolith morphometrics as a predictor of age. An important issue with such a method is that it requires known-age fish individuals. Here we used known-age Atlantic cod ( Gadus morhua ) from the Faroe Bank and Faroe Plateau stocks. Cod populations usually show quite large variation in growth rates and otolith shape. We showed that including otolith morphometrics into ageing processes has the potential to make ageing objective, accurate, and fast. Calibration analysis indicated that a known-age sample from the same population and environment is needed to obtain robust calibration; using a sample from a different stock more than doubles the error rate, even in the case of genetically highly related populations. The intercalibration method was successful but generalization from one stock to another remains problematic. The development of an otolith growth model is needed for generalization if an operational method for different populations is required in the future. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 65 11 2342 2350 |
institution |
Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Traditional age reading is a rather subjective method that lacks true reproducibility, producing ageing error that propagates up to stock assessment. One alternative is represented by the use of otolith morphometrics as a predictor of age. An important issue with such a method is that it requires known-age fish individuals. Here we used known-age Atlantic cod ( Gadus morhua ) from the Faroe Bank and Faroe Plateau stocks. Cod populations usually show quite large variation in growth rates and otolith shape. We showed that including otolith morphometrics into ageing processes has the potential to make ageing objective, accurate, and fast. Calibration analysis indicated that a known-age sample from the same population and environment is needed to obtain robust calibration; using a sample from a different stock more than doubles the error rate, even in the case of genetically highly related populations. The intercalibration method was successful but generalization from one stock to another remains problematic. The development of an otolith growth model is needed for generalization if an operational method for different populations is required in the future. |
format |
Article in Journal/Newspaper |
author |
Doering-Arjes, P. Cardinale, M. Mosegaard, H. |
spellingShingle |
Doering-Arjes, P. Cardinale, M. Mosegaard, H. Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
author_facet |
Doering-Arjes, P. Cardinale, M. Mosegaard, H. |
author_sort |
Doering-Arjes, P. |
title |
Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
title_short |
Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
title_full |
Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
title_fullStr |
Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
title_full_unstemmed |
Estimating population age structure using otolith morphometrics: a test with known-age Atlantic cod (Gadus morhua) individuals |
title_sort |
estimating population age structure using otolith morphometrics: a test with known-age atlantic cod (gadus morhua) individuals |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/f08-143 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F08-143 http://www.nrcresearchpress.com/doi/pdf/10.1139/F08-143 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 65, issue 11, page 2342-2350 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f08-143 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
65 |
container_issue |
11 |
container_start_page |
2342 |
op_container_end_page |
2350 |
_version_ |
1810431691720753152 |