Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination
We compared shapes of Atlantic mackerel (Scomber scombrus) sagittae between the two contingents (i.e. spawning groups) from the Northwest Atlantic and between the stocks from the Northwest Atlantic and the North Sea to evaluate whether otolith shape could differentiate between the two contingents in...
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Canadian Science Publishing
1991
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crcansciencepubl:10.1139/f91-041 2024-09-15T18:26:19+00:00 Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination Castonguay, Martin Simard, Patrick Gagnon, Pierre 1991 http://dx.doi.org/10.1139/f91-041 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-041 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 48, issue 2, page 296-302 ISSN 0706-652X 1205-7533 journal-article 1991 crcansciencepubl https://doi.org/10.1139/f91-041 2024-08-01T04:10:02Z We compared shapes of Atlantic mackerel (Scomber scombrus) sagittae between the two contingents (i.e. spawning groups) from the Northwest Atlantic and between the stocks from the Northwest Atlantic and the North Sea to evaluate whether otolith shape could differentiate between the two contingents in a mixed fishery. We quantified shapes with the Fourier series, an objective and rapid method which decomposes a shape's outline into a series of sinusoids. To determine a correct way to compare contingents/stocks, we first assessed four intracontingent effects on otolith shapes. Age and year-class effects were significant, while sex and bilateral position effects were not. This temporal instability in shapes indicates that confounding effects of age and year-class on otolith shapes need to be assessed carefully before drawing conclusions on stock structure. It also shows that comparative studies of otolith shapes with Fourier descriptors are not useful for mackerel contingent discrimination. The power of discriminant functions to correctly classify test mackerel samples separated by age and sampling year, on the basis of otolith shape, was better for comparisons between the stocks than for those between the contingents. Article in Journal/Newspaper Northwest Atlantic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 48 2 296 302 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We compared shapes of Atlantic mackerel (Scomber scombrus) sagittae between the two contingents (i.e. spawning groups) from the Northwest Atlantic and between the stocks from the Northwest Atlantic and the North Sea to evaluate whether otolith shape could differentiate between the two contingents in a mixed fishery. We quantified shapes with the Fourier series, an objective and rapid method which decomposes a shape's outline into a series of sinusoids. To determine a correct way to compare contingents/stocks, we first assessed four intracontingent effects on otolith shapes. Age and year-class effects were significant, while sex and bilateral position effects were not. This temporal instability in shapes indicates that confounding effects of age and year-class on otolith shapes need to be assessed carefully before drawing conclusions on stock structure. It also shows that comparative studies of otolith shapes with Fourier descriptors are not useful for mackerel contingent discrimination. The power of discriminant functions to correctly classify test mackerel samples separated by age and sampling year, on the basis of otolith shape, was better for comparisons between the stocks than for those between the contingents. |
format |
Article in Journal/Newspaper |
author |
Castonguay, Martin Simard, Patrick Gagnon, Pierre |
spellingShingle |
Castonguay, Martin Simard, Patrick Gagnon, Pierre Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
author_facet |
Castonguay, Martin Simard, Patrick Gagnon, Pierre |
author_sort |
Castonguay, Martin |
title |
Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
title_short |
Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
title_full |
Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
title_fullStr |
Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
title_full_unstemmed |
Usefulness of Fourier Analysis of Otolith Shape for Atlantic Mackerel ( Scomber scombrus) Stock Discrimination |
title_sort |
usefulness of fourier analysis of otolith shape for atlantic mackerel ( scomber scombrus) stock discrimination |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/f91-041 http://www.nrcresearchpress.com/doi/pdf/10.1139/f91-041 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 48, issue 2, page 296-302 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f91-041 |
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Canadian Journal of Fisheries and Aquatic Sciences |
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48 |
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2 |
container_start_page |
296 |
op_container_end_page |
302 |
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1810466793553133568 |