Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016
Four commercially important data-poor (currently designated as Tier 5 by the North Pacific Fishery Management Council) species were targeted for research: shortspine thornyhead (Sebastolobus alascanus), shortraker rockfish (Sebastes borealis), harlequin rockfish (S. variegatus), and redstripe rockfi...
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dataone:10.24431_rw1k43v_2020228211023 2024-10-03T18:46:01+00:00 Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 Thomas Helser Todd TenBrink Paul Spencer Christina Conrath BEGINDATE: 2009-02-01T08:00:00Z ENDDATE: 2016-08-01T08:00:00Z 2015-01-01T00:00:00Z https://search.dataone.org/view/10.24431_rw1k43v_2020228211023 unknown Research Workspace OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Sebastes variegatus harlequin rockfish Sebastes borealis shortraker rockfish Sebastes proriger redstripe rockfish Sebastolobus alascanus shortspine thornyhead, chancharro alacrán Sebastes spp. Overfishing Level Acceptable Biological Catch reproductive biology length- and age-at-maturity fisheries management rockfish sebastes age and growth reproductive biology age validation maturity Sebastolobus Dataset 2015 dataone:urn:node:RW 2024-10-03T18:16:03Z Four commercially important data-poor (currently designated as Tier 5 by the North Pacific Fishery Management Council) species were targeted for research: shortspine thornyhead (Sebastolobus alascanus), shortraker rockfish (Sebastes borealis), harlequin rockfish (S. variegatus), and redstripe rockfish (S. proriger). Research was conducted on each of these species in both the Bering Sea-Aleutian Islands (BSAI) and Gulf of Alaska (GOA) management areas. This research focused on three primary components: reproductive biology with special emphasis on maturity, age validation, and age error modeling. The maturity component involved field collections in the AI and GOA using both fisheries-independent and -dependent sampling platforms. Contemporary samples from 2014-2016 were used in the analyses, as well as previous collections from 2009-2010. The analyses resulted in female length and age at maturity estimates (ogives). Variables in the dataset include specimen information such as length, weight and age, location, year, month of collection, and maturity status (0=immature; 1=mature). These new estimates would potentially support upward movement from Tier 5 management (i.e. moving to Tier 4) by providing managers with increased information to report separate fishing reference points. Age validation analyses were based on the bomb-produced radiocarbon C-14 method. Variables in the dataset include specimen information such as length, weight, average age based on multiple ages, sex, location, year (cruise), whole otolith weight, its core weight, and C-14 material measured with 1 standard deviation. These validation results would help in potentially supporting upward movement from Tier 5 management (i.e. moving to Tier 4) by providing managers with increased information to report separate fishing reference points. This dataset was generated as part of NPRB project 1401. Dataset Bering Sea Alaska Aleutian Islands Research Workspace (via DataONE) Bering Sea Gulf of Alaska Pacific |
institution |
Open Polar |
collection |
Research Workspace (via DataONE) |
op_collection_id |
dataone:urn:node:RW |
language |
unknown |
topic |
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Sebastes variegatus harlequin rockfish Sebastes borealis shortraker rockfish Sebastes proriger redstripe rockfish Sebastolobus alascanus shortspine thornyhead, chancharro alacrán Sebastes spp. Overfishing Level Acceptable Biological Catch reproductive biology length- and age-at-maturity fisheries management rockfish sebastes age and growth reproductive biology age validation maturity Sebastolobus |
spellingShingle |
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Sebastes variegatus harlequin rockfish Sebastes borealis shortraker rockfish Sebastes proriger redstripe rockfish Sebastolobus alascanus shortspine thornyhead, chancharro alacrán Sebastes spp. Overfishing Level Acceptable Biological Catch reproductive biology length- and age-at-maturity fisheries management rockfish sebastes age and growth reproductive biology age validation maturity Sebastolobus Thomas Helser Todd TenBrink Paul Spencer Christina Conrath Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
topic_facet |
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > GULF OF ALASKA Sebastes variegatus harlequin rockfish Sebastes borealis shortraker rockfish Sebastes proriger redstripe rockfish Sebastolobus alascanus shortspine thornyhead, chancharro alacrán Sebastes spp. Overfishing Level Acceptable Biological Catch reproductive biology length- and age-at-maturity fisheries management rockfish sebastes age and growth reproductive biology age validation maturity Sebastolobus |
description |
Four commercially important data-poor (currently designated as Tier 5 by the North Pacific Fishery Management Council) species were targeted for research: shortspine thornyhead (Sebastolobus alascanus), shortraker rockfish (Sebastes borealis), harlequin rockfish (S. variegatus), and redstripe rockfish (S. proriger). Research was conducted on each of these species in both the Bering Sea-Aleutian Islands (BSAI) and Gulf of Alaska (GOA) management areas. This research focused on three primary components: reproductive biology with special emphasis on maturity, age validation, and age error modeling. The maturity component involved field collections in the AI and GOA using both fisheries-independent and -dependent sampling platforms. Contemporary samples from 2014-2016 were used in the analyses, as well as previous collections from 2009-2010. The analyses resulted in female length and age at maturity estimates (ogives). Variables in the dataset include specimen information such as length, weight and age, location, year, month of collection, and maturity status (0=immature; 1=mature). These new estimates would potentially support upward movement from Tier 5 management (i.e. moving to Tier 4) by providing managers with increased information to report separate fishing reference points. Age validation analyses were based on the bomb-produced radiocarbon C-14 method. Variables in the dataset include specimen information such as length, weight, average age based on multiple ages, sex, location, year (cruise), whole otolith weight, its core weight, and C-14 material measured with 1 standard deviation. These validation results would help in potentially supporting upward movement from Tier 5 management (i.e. moving to Tier 4) by providing managers with increased information to report separate fishing reference points. This dataset was generated as part of NPRB project 1401. |
format |
Dataset |
author |
Thomas Helser Todd TenBrink Paul Spencer Christina Conrath |
author_facet |
Thomas Helser Todd TenBrink Paul Spencer Christina Conrath |
author_sort |
Thomas Helser |
title |
Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
title_short |
Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
title_full |
Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
title_fullStr |
Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
title_full_unstemmed |
Improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the Aleutian Islands and Gulf of Alaska, 2009-2016 |
title_sort |
improving stock assessments through maturity and age validation analyses for four data-poor rockfishes in the aleutian islands and gulf of alaska, 2009-2016 |
publisher |
Research Workspace |
publishDate |
2015 |
url |
https://search.dataone.org/view/10.24431_rw1k43v_2020228211023 |
op_coverage |
BEGINDATE: 2009-02-01T08:00:00Z ENDDATE: 2016-08-01T08:00:00Z |
geographic |
Bering Sea Gulf of Alaska Pacific |
geographic_facet |
Bering Sea Gulf of Alaska Pacific |
genre |
Bering Sea Alaska Aleutian Islands |
genre_facet |
Bering Sea Alaska Aleutian Islands |
_version_ |
1811923340593463296 |