Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea
We developed an age- and size-structured equilibrium model using the software package R to examine the long-term relationship between fishing mortality and size-at-age of Pacific halibut. We limited our study to International Pacific Halibut Commission (IPHC) regulatory areas in the Gulf of Alaska (...
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dataone:10.24431_rw1k453_2020_6_12_194029 2024-10-03T18:46:01+00:00 Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea Steve Martell 2020-06-12T19:40:29.991Z https://search.dataone.org/view/10.24431_rw1k453_2020_6_12_194029 unknown Research Workspace OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Hippoglossus stenolepis Pacific halibut, alabato del Pacífico Pacific halibut stock assessment growth fishing effects fishing mortality stock assessment management reference points size-at-age over fishing Size-selective fishing North Pacific Research Board Dataset dataone:urn:node:RW 2024-10-03T18:16:21Z We developed an age- and size-structured equilibrium model using the software package R to examine the long-term relationship between fishing mortality and size-at-age of Pacific halibut. We limited our study to International Pacific Halibut Commission (IPHC) regulatory areas in the Gulf of Alaska (2B, 2C, 3A, and 3B), because these areas provide the greatest contrast in terms of historical fishing mortality and changes in size-at-age. Primary inputs to the equilibrium model included sex and area-specific von Bertalanffy growth parameters that were estimated externally using fisheries-independent observations of halibut length-at-age collected by the IPHC collected from 1980 to 1989, when halibut size-at-age was at its peak. This growth curve, which defines mean size-at-age and variability in size-at-age, was used to generate a series of “growth-type groups,” or groups within a cohort that differ in growth and relative abundance. Additional model inputs included parameters associated with maturity, natural mortality, length-weight allometry, and recruitment Model results were evaluated in terms of changes in mean size-at-age with fishing mortality under equilibrium conditions. Model outputs used for Sullivan (2016) include a data frame of predicted weight-at-age under varying equilibrium fishing mortalities, size limits, and discard mortality rates. This model was coded in the statistical software program R version 3.2.5 (R Core Team 2016). Model results are stored as a dataframe within R but could be exported as a csv or text file. Dataset Bering Sea Alaska Research Workspace (via DataONE) Bering Sea Gulf of Alaska Pacific Sullivan ENVELOPE(-63.817,-63.817,-69.650,-69.650) |
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OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Hippoglossus stenolepis Pacific halibut, alabato del Pacífico Pacific halibut stock assessment growth fishing effects fishing mortality stock assessment management reference points size-at-age over fishing Size-selective fishing North Pacific Research Board |
spellingShingle |
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Hippoglossus stenolepis Pacific halibut, alabato del Pacífico Pacific halibut stock assessment growth fishing effects fishing mortality stock assessment management reference points size-at-age over fishing Size-selective fishing North Pacific Research Board Steve Martell Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
topic_facet |
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Hippoglossus stenolepis Pacific halibut, alabato del Pacífico Pacific halibut stock assessment growth fishing effects fishing mortality stock assessment management reference points size-at-age over fishing Size-selective fishing North Pacific Research Board |
description |
We developed an age- and size-structured equilibrium model using the software package R to examine the long-term relationship between fishing mortality and size-at-age of Pacific halibut. We limited our study to International Pacific Halibut Commission (IPHC) regulatory areas in the Gulf of Alaska (2B, 2C, 3A, and 3B), because these areas provide the greatest contrast in terms of historical fishing mortality and changes in size-at-age. Primary inputs to the equilibrium model included sex and area-specific von Bertalanffy growth parameters that were estimated externally using fisheries-independent observations of halibut length-at-age collected by the IPHC collected from 1980 to 1989, when halibut size-at-age was at its peak. This growth curve, which defines mean size-at-age and variability in size-at-age, was used to generate a series of “growth-type groups,” or groups within a cohort that differ in growth and relative abundance. Additional model inputs included parameters associated with maturity, natural mortality, length-weight allometry, and recruitment Model results were evaluated in terms of changes in mean size-at-age with fishing mortality under equilibrium conditions. Model outputs used for Sullivan (2016) include a data frame of predicted weight-at-age under varying equilibrium fishing mortalities, size limits, and discard mortality rates. This model was coded in the statistical software program R version 3.2.5 (R Core Team 2016). Model results are stored as a dataframe within R but could be exported as a csv or text file. |
format |
Dataset |
author |
Steve Martell |
author_facet |
Steve Martell |
author_sort |
Steve Martell |
title |
Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
title_short |
Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
title_full |
Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
title_fullStr |
Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
title_full_unstemmed |
Climate, and Ecological Effects on Pacific Halibut Size-at-age: Cumulative effects of size-selective fishing on size-at-age in the Gulf of Alaska and Bering Sea |
title_sort |
climate, and ecological effects on pacific halibut size-at-age: cumulative effects of size-selective fishing on size-at-age in the gulf of alaska and bering sea |
publisher |
Research Workspace |
publishDate |
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url |
https://search.dataone.org/view/10.24431_rw1k453_2020_6_12_194029 |
long_lat |
ENVELOPE(-63.817,-63.817,-69.650,-69.650) |
geographic |
Bering Sea Gulf of Alaska Pacific Sullivan |
geographic_facet |
Bering Sea Gulf of Alaska Pacific Sullivan |
genre |
Bering Sea Alaska |
genre_facet |
Bering Sea Alaska |
_version_ |
1811923334436225024 |