Stock Discrimination Using Otolith Shape Analysis
Otolith shape has long been known to be species specific, but recent reports have pointed to its value as an indicator of stock identity. To test this hypothesis, all three pairs of otoliths were sampled from 2349 Atlantic cod (Gadus morhua) collected on spawning grounds throughout the northwest Atl...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1993
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Online Access: | http://dx.doi.org/10.1139/f93-123 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-123 |
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crcansciencepubl:10.1139/f93-123 2024-06-23T07:51:05+00:00 Stock Discrimination Using Otolith Shape Analysis Campana, Steven E. Casselman, John M. 1993 http://dx.doi.org/10.1139/f93-123 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-123 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 5, page 1062-1083 ISSN 0706-652X 1205-7533 journal-article 1993 crcansciencepubl https://doi.org/10.1139/f93-123 2024-05-24T13:05:51Z Otolith shape has long been known to be species specific, but recent reports have pointed to its value as an indicator of stock identity. To test this hypothesis, all three pairs of otoliths were sampled from 2349 Atlantic cod (Gadus morhua) collected on spawning grounds throughout the northwest Atlantic. Otolith shape was determined with Fourier analysis and combined with measures of otolith area and perimeter. There were highly significant differences in otolith shape among most of the cod samples, but shape also differed among ages, sexes, and year-classes. The sagittal otoliths (largest pair) provided slightly better stock discrimination than did the lapillar or asteriscal otoliths. The first discriminant function was highly correlated with both fish and otolith growth rate, indicating that stock discrimination improved as the difference in stock-specific growth rate increased. Reevaluation of published studies on other species indicated that growth rate contributes more variation to regional differences in otolith shape than does stock origin. Differences in otolith shape among ages, sexes, and year-classes were also attributable to growth rate differences. To the extent that growth rates vary more between than within stocks, otolith shape analysis can provide an easily determined measure of stock identity. Article in Journal/Newspaper atlantic cod Gadus morhua Northwest Atlantic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 50 5 1062 1083 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
Otolith shape has long been known to be species specific, but recent reports have pointed to its value as an indicator of stock identity. To test this hypothesis, all three pairs of otoliths were sampled from 2349 Atlantic cod (Gadus morhua) collected on spawning grounds throughout the northwest Atlantic. Otolith shape was determined with Fourier analysis and combined with measures of otolith area and perimeter. There were highly significant differences in otolith shape among most of the cod samples, but shape also differed among ages, sexes, and year-classes. The sagittal otoliths (largest pair) provided slightly better stock discrimination than did the lapillar or asteriscal otoliths. The first discriminant function was highly correlated with both fish and otolith growth rate, indicating that stock discrimination improved as the difference in stock-specific growth rate increased. Reevaluation of published studies on other species indicated that growth rate contributes more variation to regional differences in otolith shape than does stock origin. Differences in otolith shape among ages, sexes, and year-classes were also attributable to growth rate differences. To the extent that growth rates vary more between than within stocks, otolith shape analysis can provide an easily determined measure of stock identity. |
format |
Article in Journal/Newspaper |
author |
Campana, Steven E. Casselman, John M. |
spellingShingle |
Campana, Steven E. Casselman, John M. Stock Discrimination Using Otolith Shape Analysis |
author_facet |
Campana, Steven E. Casselman, John M. |
author_sort |
Campana, Steven E. |
title |
Stock Discrimination Using Otolith Shape Analysis |
title_short |
Stock Discrimination Using Otolith Shape Analysis |
title_full |
Stock Discrimination Using Otolith Shape Analysis |
title_fullStr |
Stock Discrimination Using Otolith Shape Analysis |
title_full_unstemmed |
Stock Discrimination Using Otolith Shape Analysis |
title_sort |
stock discrimination using otolith shape analysis |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/f93-123 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-123 |
genre |
atlantic cod Gadus morhua Northwest Atlantic |
genre_facet |
atlantic cod Gadus morhua Northwest Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 5, page 1062-1083 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f93-123 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
50 |
container_issue |
5 |
container_start_page |
1062 |
op_container_end_page |
1083 |
_version_ |
1802642086540869632 |