2003 Report of Assessment and Research Activities

The IPHC Report of Assessment and Research Activities is a compilation of progress reports relating to staff activities. for e-mail addresses or by phoning the Seattle office at (206) 634-1838.

  • Cover by Forsberg (pdf 180K)
  • Section 1 (pp. 1-30, pdf 166K)
    • Contents
    • IPHC research program: Review of 2003 projects and proposals for 2004 
  • Section 2 - The Fishery
    • Removals (pp. 31-60, pdf 294K)
      • 2003 Commercial fishery and regulation changes
      • 2003 Sport Fishery
      • Wastage in the 2003 Pacific halibut fishery
      • Estimates of the 2003 personal use harvest
      • Retention of sublegal halibut in the Areas 4D/4E CDQ fishery: 2003 harvests
    • Sampling and Analysis (pp. 61-96, pdf 220K)
      • Report from the multi-agency and industry work group meeting on the implications of extending the halibut season
      • Commercial catch sampling
      • Age distribution of the commercial halibut catch for 2003
      • The presence of swivels on snapped hook gear in the halibut fishery
      • Whale and shark interactions with fishing for halibut
  • Section 3a - Population Assessment (pp. 97-162, pdf 1.8MB)
    • Statistical distribution of IPHC age readings
    • A method of estimation the sex composition of commercial landings from setline survey data
    • Sources of uncertainty in annual CEY estimates (pp. 163-212, pdf 393K)
    • Assessment of the Pacific halibut stock at the end of 2003
    • The conditional constant catch (CCC) harvest policy:  Summary and estimated CCC yield for 2004 
  • Section 3b - Bycatch (pp. 213-272, pdf 803K)
    • Incidental catch and mortality of Pacific halibut, 1962-2003
    • Pacific halibut discard mortality rates in the 1990-2002 Alaskan groundfish fisheries, with recommendations for monitoring in 2004-2006
    • Bycatch mortality and length composition for IPHC Areas 4A, 4B, and 4CDE from 1990-2002
    • The Bering Sea trawl fishery Prohibited Species Donation Program: Results from 1998-2003
    • Bycatch mortality and size distribution extrapolation methodology
  • Section 4 - Biological Research
    • General I (pp. 273-322, pdf 915MB)
      • Assessing seasonal migration of adult halibut in the Gulf of Alaska using pop-up satellite-transmitting archival tags
      • Using halibut otolith microchemistry to determine nursery origin: Progress report on an initial test of concept
      • Description of a Pacific halibut chronology of bomb radiocarbon from 1944-1981 and a validation of ageing methods
      • Suitability of glycerin-preserved otoliths for age validation using bomb radiocarbon
      • The dual functionality of glycerin
      • Deployment of the Seacat water column profiler in 2003
      • The effect of prior hooking injuries on the feeding habits of Pacific halibut
    • General II (pp. 323-348, pdf 459K)
      • Methyl mercury and heavy metal contaminant levels in Alaskan halibut
      • Project report: Understanding chalky halibut
      • A project to test the use of digital video for monitoring the compliance of seabird avoidance devices and seabird mortality in halibut longline fisheries
      • The efficacy of electronic monitoring systems:  A case study on the applicability of video technology for fisheries management
      • Analysis of gonad staging on the IPHC setline survey
    • Tagging (pp 349-394, pdf 1.0K)
      • 2003 PIT tagging: Tagging equipment and protocol, and shedding studies
      • Portside sampling for recovered PIT tags in Pacific halibut
      • Preliminary analysis of the IPHC PIT tagging experiment in 2003
      • Tagging studies
    • Survey results and analysis (pp. 395-446, pdf 1.9MB)
      • 2003 Standardized stock assessment survey
      • Cruise report for the 2003 NMFS Bering Sea trawl survey
      • Cruise report for the 2003 NMFS Gulf of Alaska trawl survey
      • Prior Hook Injuries (PHI):  Results from the 2003 IPHC SSA surveys and NMFS Bering Sea trawl surveys
      • Results from the 2002 seabird occurrence data
      • Size and age composition of Pacific halibut in NMFS Bering Sea shelf trawl surveys (pp. 447-476, pdf 530KB)
      • NMFS trawl survey abundance estimates, distribution, and age composition of Pacific halibut in the Gulf of Alaska
      • Age distribution of Pacific halibut in IPHC stock assessment setline surveys

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