Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River
The simple-Petersen estimator is a well-known mark-recapture method to estimate animal abundance. Two key assumptions are equal catchability in both samples and complete mixing of tagged and untagged animals. If these are violated, severe bias can occur. The stratified-Petersen estimator can be used...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1998
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Online Access: | http://dx.doi.org/10.1139/f97-238 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-238 |
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crcansciencepubl:10.1139/f97-238 2024-09-09T20:02:04+00:00 Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River Schwarz, Carl James Taylor, Carolyn Gail 1998 http://dx.doi.org/10.1139/f97-238 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-238 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 2, page 281-296 ISSN 0706-652X 1205-7533 journal-article 1998 crcansciencepubl https://doi.org/10.1139/f97-238 2024-06-20T04:11:56Z The simple-Petersen estimator is a well-known mark-recapture method to estimate animal abundance. Two key assumptions are equal catchability in both samples and complete mixing of tagged and untagged animals. If these are violated, severe bias can occur. The stratified-Petersen estimator can be used to account for some of the heterogeneity in catchability or mixing. In this paper, we first review recent developments in the stratified-Petersen experiment for fisheries audiences and demonstrate some of the practical problems that can occur that have not been discussed in the theoretical literature. Second, we present a case study to estimate the gross escapement of Fraser River pink salmon (Oncorhynchus gorbuscha) in 1991. The motivation for this study is a discrepancy of over 5 million fish between the estimates as derived by the Pacific Salmon Commission (PSC) (7.5 million fish based on a hydroacoustic method) and the Department of Fisheries and Oceans (DFO), Canada (13.0 million fish based on a mark-recapture method). One hypothesis put forward was that the discrepancy may be due to the use of a pooled-Petersen estimator when there is differential migration over time. The stratified-Petersen model suggests that little of this discrepancy can be explained by differential migration. Article in Journal/Newspaper Oncorhynchus gorbuscha Pink salmon Canadian Science Publishing Canada Fraser River ENVELOPE(-62.243,-62.243,56.619,56.619) Pacific Petersen ENVELOPE(-101.250,-101.250,-71.917,-71.917) Canadian Journal of Fisheries and Aquatic Sciences 55 2 281 296 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The simple-Petersen estimator is a well-known mark-recapture method to estimate animal abundance. Two key assumptions are equal catchability in both samples and complete mixing of tagged and untagged animals. If these are violated, severe bias can occur. The stratified-Petersen estimator can be used to account for some of the heterogeneity in catchability or mixing. In this paper, we first review recent developments in the stratified-Petersen experiment for fisheries audiences and demonstrate some of the practical problems that can occur that have not been discussed in the theoretical literature. Second, we present a case study to estimate the gross escapement of Fraser River pink salmon (Oncorhynchus gorbuscha) in 1991. The motivation for this study is a discrepancy of over 5 million fish between the estimates as derived by the Pacific Salmon Commission (PSC) (7.5 million fish based on a hydroacoustic method) and the Department of Fisheries and Oceans (DFO), Canada (13.0 million fish based on a mark-recapture method). One hypothesis put forward was that the discrepancy may be due to the use of a pooled-Petersen estimator when there is differential migration over time. The stratified-Petersen model suggests that little of this discrepancy can be explained by differential migration. |
format |
Article in Journal/Newspaper |
author |
Schwarz, Carl James Taylor, Carolyn Gail |
spellingShingle |
Schwarz, Carl James Taylor, Carolyn Gail Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
author_facet |
Schwarz, Carl James Taylor, Carolyn Gail |
author_sort |
Schwarz, Carl James |
title |
Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
title_short |
Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
title_full |
Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
title_fullStr |
Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
title_full_unstemmed |
Use of the stratified-Petersen estimator in fisheries management: estimating the number of pink salmon ( Oncorhynchus gorbuscha) spawners in the Fraser River |
title_sort |
use of the stratified-petersen estimator in fisheries management: estimating the number of pink salmon ( oncorhynchus gorbuscha) spawners in the fraser river |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/f97-238 http://www.nrcresearchpress.com/doi/pdf/10.1139/f97-238 |
long_lat |
ENVELOPE(-62.243,-62.243,56.619,56.619) ENVELOPE(-101.250,-101.250,-71.917,-71.917) |
geographic |
Canada Fraser River Pacific Petersen |
geographic_facet |
Canada Fraser River Pacific Petersen |
genre |
Oncorhynchus gorbuscha Pink salmon |
genre_facet |
Oncorhynchus gorbuscha Pink salmon |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 2, page 281-296 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f97-238 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
55 |
container_issue |
2 |
container_start_page |
281 |
op_container_end_page |
296 |
_version_ |
1809934058885480448 |