Efficient statistical estimators and sampling strategies for estimating the age composition of fish
Estimates of age compositions of fish populations or catches that are fundamental inputs to analytical stock assessment models are generally obtained from sample surveys, and multistage cluster sampling of fish is the norm. We use simulations and extensive empirical survey data for Northeast Arctic...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/cjfas-2014-0408 2024-06-23T07:48:57+00:00 Efficient statistical estimators and sampling strategies for estimating the age composition of fish Aanes, Sondre Vølstad, Jon Helge Trenkel, Verena 2015 http://dx.doi.org/10.1139/cjfas-2014-0408 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2014-0408 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2014-0408 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 72, issue 6, page 938-953 ISSN 0706-652X 1205-7533 journal-article 2015 crcansciencepubl https://doi.org/10.1139/cjfas-2014-0408 2024-06-13T04:10:49Z Estimates of age compositions of fish populations or catches that are fundamental inputs to analytical stock assessment models are generally obtained from sample surveys, and multistage cluster sampling of fish is the norm. We use simulations and extensive empirical survey data for Northeast Arctic cod (Gadus morhua) to compare the efficiency of estimators that use age–length keys (ALKs) with design-based estimators for estimating age compositions of fish. The design-based weighted ratio estimator produces the most accurate estimates for cluster-correlated data, and an alternative estimator based on a weighted ALK is equivalent under certain constraints. Using simulations to evaluate subsampling strategies, we show that otolith collections from a length-stratified subsample of one fish per 5 cm length bin (∼10 fish total) per haul or trip is sufficient and nearly as efficient as a random subsample of 20 fish. Our study also indicates that the common practice of applying fixed ALKs to length composition data can severely underestimate the variance in estimates of age compositions and that “borrowing” of ALKs developed for other gears, areas, or time periods can cause serious bias. Article in Journal/Newspaper Arctic cod Arctic Gadus morhua Northeast Arctic cod Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 72 6 938 953 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Estimates of age compositions of fish populations or catches that are fundamental inputs to analytical stock assessment models are generally obtained from sample surveys, and multistage cluster sampling of fish is the norm. We use simulations and extensive empirical survey data for Northeast Arctic cod (Gadus morhua) to compare the efficiency of estimators that use age–length keys (ALKs) with design-based estimators for estimating age compositions of fish. The design-based weighted ratio estimator produces the most accurate estimates for cluster-correlated data, and an alternative estimator based on a weighted ALK is equivalent under certain constraints. Using simulations to evaluate subsampling strategies, we show that otolith collections from a length-stratified subsample of one fish per 5 cm length bin (∼10 fish total) per haul or trip is sufficient and nearly as efficient as a random subsample of 20 fish. Our study also indicates that the common practice of applying fixed ALKs to length composition data can severely underestimate the variance in estimates of age compositions and that “borrowing” of ALKs developed for other gears, areas, or time periods can cause serious bias. |
author2 |
Trenkel, Verena |
format |
Article in Journal/Newspaper |
author |
Aanes, Sondre Vølstad, Jon Helge |
spellingShingle |
Aanes, Sondre Vølstad, Jon Helge Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
author_facet |
Aanes, Sondre Vølstad, Jon Helge |
author_sort |
Aanes, Sondre |
title |
Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
title_short |
Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
title_full |
Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
title_fullStr |
Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
title_full_unstemmed |
Efficient statistical estimators and sampling strategies for estimating the age composition of fish |
title_sort |
efficient statistical estimators and sampling strategies for estimating the age composition of fish |
publisher |
Canadian Science Publishing |
publishDate |
2015 |
url |
http://dx.doi.org/10.1139/cjfas-2014-0408 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2014-0408 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2014-0408 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Gadus morhua Northeast Arctic cod |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 72, issue 6, page 938-953 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2014-0408 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
72 |
container_issue |
6 |
container_start_page |
938 |
op_container_end_page |
953 |
_version_ |
1802639248993550336 |