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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Canadian Science Publishing
2022-01-01
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| Series: | FACETS |
| Subjects: | |
| Online Access: | https://facetsjournal.com/doi/10.1139/facets-2021-0061 |
| _version_ | 1797979335656734720 |
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| author | Jonathan I. Richar Robert J. Foy |
| author_facet | Jonathan I. Richar Robert J. Foy |
| author_sort | Jonathan I. Richar |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-11T05:37:20Z |
| format | Article |
| id | doaj.art-bc4c91d5748d48ec94b2942d9feff075 |
| institution | Directory Open Access Journal |
| issn | 2371-1671 |
| language | English |
| last_indexed | 2024-04-11T05:37:20Z |
| publishDate | 2022-01-01 |
| publisher | Canadian Science Publishing |
| record_format | Article |
| series | FACETS |
| spelling | doaj.art-bc4c91d5748d48ec94b2942d9feff0752022-12-22T11:00:16ZengCanadian Science PublishingFACETS2371-16712022-01-0171598161610.1139/facets-2021-0061A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdiJonathan I. Richar0Robert J. Foy1Kodiak Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 301 Research Court, Kodiak, AK 99615, USAAlaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 17109 Pt. Lena Loop Road, Juneau AK 99801, USAAccurate 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.https://facetsjournal.com/doi/10.1139/facets-2021-0061Chionoecetes bairdimorphometric maturitymaturity classificationBering Seabimodal distributiondistribution minima |
| spellingShingle | Jonathan I. Richar Robert J. Foy A novel morphometry-based method for assessing maturity in male Tanner crab, Chionoecetes bairdi FACETS Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima |
| title | 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_short | 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 |
| topic | Chionoecetes bairdi morphometric maturity maturity classification Bering Sea bimodal distribution distribution minima |
| url | https://facetsjournal.com/doi/10.1139/facets-2021-0061 |
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