A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi
Accurate classification of maturity status and estimation of size at 50% maturity for male crabs are important to the management of North Pacific crab stocks, which form the basis of several economically valuable fisheries. We demonstrate a straightforward maturity classification approach applied to...
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Canadian Science Publishing
2022
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Online Access: | https://doi.org/10.1139/facets-2021-0061 https://doaj.org/article/bc4c91d5748d48ec94b2942d9feff075 |
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ftdoajarticles:oai:doaj.org/article:bc4c91d5748d48ec94b2942d9feff075 2023-05-15T15:43:28+02:00 A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi Jonathan I. Richar Robert J. Foy 2022-01-01T00:00:00Z https://doi.org/10.1139/facets-2021-0061 https://doaj.org/article/bc4c91d5748d48ec94b2942d9feff075 EN eng Canadian Science Publishing https://facetsjournal.com/doi/10.1139/facets-2021-0061 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2021-0061 2371-1671 https://doaj.org/article/bc4c91d5748d48ec94b2942d9feff075 FACETS, Vol 7, Iss , Pp 1598-1616 (2022) Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima Education L Science Q article 2022 ftdoajarticles https://doi.org/10.1139/facets-2021-0061 2022-12-30T19:33:16Z Accurate classification of maturity status and estimation of size at 50% maturity for male crabs are important to the management of North Pacific crab stocks, which form the basis of several economically valuable fisheries. We demonstrate a straightforward maturity classification approach applied to male Tanner crabs (Chionoecetes bairdi), based on the use of log-transformed chela height distributions calculated via kernel density functions. The linear equation defining the relationship between the minima of these chela height distributions, and the midpoint of the corresponding carapace width bins is then used to estimate the incidence of maturity by size group across the population. We demonstrate the performance of this approach relative to two other currently applied methodologies. Finally, we apply this method to assess annual size at 50% maturity in eastern Bering Sea male Tanner crabs, and spatiotemporal trends in this parameter. We demonstrate the existence of high interannual and spatial variability in this population metric and find evidence of a decline in size at maturity in the western stock. Article in Journal/Newspaper Bering Sea Chionoecetes bairdi Tanner crab Directory of Open Access Journals: DOAJ Articles Bering Sea Pacific FACETS 7 1598 1616 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima Education L Science Q |
spellingShingle |
Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima Education L Science Q Jonathan I. Richar Robert J. Foy A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
topic_facet |
Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima Education L Science Q |
description |
Accurate classification of maturity status and estimation of size at 50% maturity for male crabs are important to the management of North Pacific crab stocks, which form the basis of several economically valuable fisheries. We demonstrate a straightforward maturity classification approach applied to male Tanner crabs (Chionoecetes bairdi), based on the use of log-transformed chela height distributions calculated via kernel density functions. The linear equation defining the relationship between the minima of these chela height distributions, and the midpoint of the corresponding carapace width bins is then used to estimate the incidence of maturity by size group across the population. We demonstrate the performance of this approach relative to two other currently applied methodologies. Finally, we apply this method to assess annual size at 50% maturity in eastern Bering Sea male Tanner crabs, and spatiotemporal trends in this parameter. We demonstrate the existence of high interannual and spatial variability in this population metric and find evidence of a decline in size at maturity in the western stock. |
format |
Article in Journal/Newspaper |
author |
Jonathan I. Richar Robert J. Foy |
author_facet |
Jonathan I. Richar Robert J. Foy |
author_sort |
Jonathan I. Richar |
title |
A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
title_short |
A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
title_full |
A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
title_fullStr |
A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
title_full_unstemmed |
A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi |
title_sort |
novel morphometry-based method for assessing maturity in male tanner crab, chionoecetes bairdi |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1139/facets-2021-0061 https://doaj.org/article/bc4c91d5748d48ec94b2942d9feff075 |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea Chionoecetes bairdi Tanner crab |
genre_facet |
Bering Sea Chionoecetes bairdi Tanner crab |
op_source |
FACETS, Vol 7, Iss , Pp 1598-1616 (2022) |
op_relation |
https://facetsjournal.com/doi/10.1139/facets-2021-0061 https://doaj.org/toc/2371-1671 doi:10.1139/facets-2021-0061 2371-1671 https://doaj.org/article/bc4c91d5748d48ec94b2942d9feff075 |
op_doi |
https://doi.org/10.1139/facets-2021-0061 |
container_title |
FACETS |
container_volume |
7 |
container_start_page |
1598 |
op_container_end_page |
1616 |
_version_ |
1766377624939003904 |