Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio )
Change-in-ratio and index-removal estimators are presented in a general form suitable for fisheries studies of closed populations. We also show how to combine the two approaches in a single estimator. In order to use these methods, it is necessary to sample the population before and after the fisher...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1993
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Online Access: | http://dx.doi.org/10.1139/f93-167 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-167 |
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crcansciencepubl:10.1139/f93-167 2023-12-17T10:28:48+01:00 Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) Dawe, Earl G. Hoenig, John M. Xu, Xucai 1993 http://dx.doi.org/10.1139/f93-167 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-167 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 7, page 1467-1476 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1993 crcansciencepubl https://doi.org/10.1139/f93-167 2023-11-19T13:39:30Z Change-in-ratio and index-removal estimators are presented in a general form suitable for fisheries studies of closed populations. We also show how to combine the two approaches in a single estimator. In order to use these methods, it is necessary to sample the population before and after the fishery and to determine the total harvest and its composition. We used the methods to estimate the population of legal-size snow crab (Chionoecetes opilio) in St. Mary's Bay, Newfoundland, before and after the fishery and to estimate the catchability coefficient and exploitation rate. It is also possible to estimate the abundance of prerecruits but this requires the assumption of equal catchability of all animals, a condition that may not be met. These methods have been largely neglected by fishery scientists; however, they seem to be ideally suited for studies of many temperate populations of large sedentary crustaceans, particularly those subjected to fisheries of short duration. Article in Journal/Newspaper Chionoecetes opilio Newfoundland Snow crab Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 50 7 1467 1476 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Dawe, Earl G. Hoenig, John M. Xu, Xucai Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Change-in-ratio and index-removal estimators are presented in a general form suitable for fisheries studies of closed populations. We also show how to combine the two approaches in a single estimator. In order to use these methods, it is necessary to sample the population before and after the fishery and to determine the total harvest and its composition. We used the methods to estimate the population of legal-size snow crab (Chionoecetes opilio) in St. Mary's Bay, Newfoundland, before and after the fishery and to estimate the catchability coefficient and exploitation rate. It is also possible to estimate the abundance of prerecruits but this requires the assumption of equal catchability of all animals, a condition that may not be met. These methods have been largely neglected by fishery scientists; however, they seem to be ideally suited for studies of many temperate populations of large sedentary crustaceans, particularly those subjected to fisheries of short duration. |
format |
Article in Journal/Newspaper |
author |
Dawe, Earl G. Hoenig, John M. Xu, Xucai |
author_facet |
Dawe, Earl G. Hoenig, John M. Xu, Xucai |
author_sort |
Dawe, Earl G. |
title |
Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
title_short |
Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
title_full |
Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
title_fullStr |
Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
title_full_unstemmed |
Change-in-Ratio and Index-Removal Methods for Population Assessment and Their Application to Snow Crab ( Chionoecetes opilio ) |
title_sort |
change-in-ratio and index-removal methods for population assessment and their application to snow crab ( chionoecetes opilio ) |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/f93-167 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-167 |
genre |
Chionoecetes opilio Newfoundland Snow crab |
genre_facet |
Chionoecetes opilio Newfoundland Snow crab |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 7, page 1467-1476 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f93-167 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
50 |
container_issue |
7 |
container_start_page |
1467 |
op_container_end_page |
1476 |
_version_ |
1785580999251329024 |