Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean
Abstract: We estimated bias-corrected mean fork lengths of gillnet-caught chum salmon using a size selectivity estimate of the gillnet to test how the bias correction affects the estimated temporal pattern of chum salmon body size, during 1971–1994 and 1994–2007. Results showed bias-corrected mean f...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.183.1429 2023-05-15T15:43:48+02:00 Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean Masa-aki Fukuwaka Nancy D. Davis Tomonori Azumaya Toru Nagasawa The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.183.1429 http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.183.1429 http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf chum salmon ocean survey fish size temporal trend gillnet selectivity sampling bias text ftciteseerx 2016-01-07T16:32:24Z Abstract: We estimated bias-corrected mean fork lengths of gillnet-caught chum salmon using a size selectivity estimate of the gillnet to test how the bias correction affects the estimated temporal pattern of chum salmon body size, during 1971–1994 and 1994–2007. Results showed bias-corrected mean fork lengths were smaller than uncorrected means. Therefore, when examining ontogenetic changes in fish size (e.g. the growth trajectory) using data collected by research gillnets, the uncorrected mean fork length can overestimate the true value. Comparison of temporal trends in bias-corrected mean fish lengths to uncorrected means showed similar results because both illustrated a decrease in chum salmon fork length in 1971–1994, and a stable fish size after 1994. Uncorrected mean values of chum salmon fork length for fish caught using research gillnets can be used as a proxy for fish size to examine temporal trends. We conclude that interpreting temporal trends using either uncorrected or bias-corrected data will support the same general conclusions regarding long-term changes in chum salmon body size. Text Bering Sea Unknown Bering Sea Pacific Salmon Fork ENVELOPE(-141.005,-141.005,66.544,66.544) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
chum salmon ocean survey fish size temporal trend gillnet selectivity sampling bias |
spellingShingle |
chum salmon ocean survey fish size temporal trend gillnet selectivity sampling bias Masa-aki Fukuwaka Nancy D. Davis Tomonori Azumaya Toru Nagasawa Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
topic_facet |
chum salmon ocean survey fish size temporal trend gillnet selectivity sampling bias |
description |
Abstract: We estimated bias-corrected mean fork lengths of gillnet-caught chum salmon using a size selectivity estimate of the gillnet to test how the bias correction affects the estimated temporal pattern of chum salmon body size, during 1971–1994 and 1994–2007. Results showed bias-corrected mean fork lengths were smaller than uncorrected means. Therefore, when examining ontogenetic changes in fish size (e.g. the growth trajectory) using data collected by research gillnets, the uncorrected mean fork length can overestimate the true value. Comparison of temporal trends in bias-corrected mean fish lengths to uncorrected means showed similar results because both illustrated a decrease in chum salmon fork length in 1971–1994, and a stable fish size after 1994. Uncorrected mean values of chum salmon fork length for fish caught using research gillnets can be used as a proxy for fish size to examine temporal trends. We conclude that interpreting temporal trends using either uncorrected or bias-corrected data will support the same general conclusions regarding long-term changes in chum salmon body size. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Masa-aki Fukuwaka Nancy D. Davis Tomonori Azumaya Toru Nagasawa |
author_facet |
Masa-aki Fukuwaka Nancy D. Davis Tomonori Azumaya Toru Nagasawa |
author_sort |
Masa-aki Fukuwaka |
title |
Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
title_short |
Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
title_full |
Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
title_fullStr |
Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
title_full_unstemmed |
Bias-Corrected Size Trends in Chum Salmon in the Central Bering Sea and North Pacific Ocean |
title_sort |
bias-corrected size trends in chum salmon in the central bering sea and north pacific ocean |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.183.1429 http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf |
long_lat |
ENVELOPE(-141.005,-141.005,66.544,66.544) |
geographic |
Bering Sea Pacific Salmon Fork |
geographic_facet |
Bering Sea Pacific Salmon Fork |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_source |
http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.183.1429 http://www.npafc.org/new/publications/Bulletin/Bulletin%20No.%205/NPAFC_Bull_5_173-176%28Fukuwaka%29.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766378008556339200 |