2005 Report of Assessment and Research Activities

The IPHC Report of Assessment and Research Activities is a compilation of progress reports relating to staff activities. Some of the information contained here has changed since printing as new data is gathered and analyzed.

  • Cover by Forsberg (pdf 200KB)
  • Contents (pp. 1-8, pdf 200KB)
  • Section 1 (pp. 9-34, pdf 302KB)
    • IPHC research program: Review of 2005 projects and proposals for 2006 
  • Section 2 - The Fishery (pp. 35-90, pdf 515KB)
    • Removals 
      • 2005 Commercial fishery and regulation changes
      • 2005 Sport Fishery
      • Wastage in the 2005 Pacific halibut fishery
      • The personal use harvest of Pacific halibut in 2004
      • Retention of sublegal halibut in the Areas 4D/4E CDQ fishery: 2005 harvests
    • Sampling and Analysis
      • Commercial catch sampling
      • Overview of the IPHC catch sampling strategy
      • Age distribution of the commercial halibut catch for 2005
  • Section 3a - Population Assessment (pp. 91-150, pdf 726KB)
    • Effects of gear type, hook spacing, and hook size on commercial selectivity and catchability
    • Assessment of the Pacific halibut stock at the end of 2005
    • Analysis of PIT tag recoveries through 2005
    • 2005 Harvest policy considerations and five year yield projections 
    • Area 4B population decline - should yield be lowered?
  • Section 3b - Bycatch (pp. 151-178, pdf 341KB)
    • Incidental catch and mortality of Pacific halibut, 1962-2005
    • Pacific halibut discard mortality rates in the 2004 Alaskan groundfish fisheries, with recommendations for monitoring in 2006
    • The Bering Sea trawl fishery Prohibited Species Donation Program: Results from 1998-2005
  • Section 4 - Biological Research
    • General I (pp. 179-214, pdf 1.6 MB)
      • Using otolith chemistry to determine halibut nursery origin:  an initial test of concept
      • False annuli identification in juvenile halibut ages one to four - progress report
      • Thermal habitat preferences of Pacific halibut and the potential influence of hydrographic variability on a local coastal fishery: 2005 project progress report
      • Deployment of the Seacat water column profiler in 2005
      • Analysis of halibut gonad staging project update
    • General II (pp. 215-252, pdf 904KB)
      • 2005 hook size and spacing experiment
      • Ambicoloration and flesh quality in Pacific halibut, Hippoglossus stenolepis
      • Technique development for age determination of the Pacific sleeper shark (Somniosus pacificus)
      • Homogeneity test for the Pacific sleeper shark (Somniosus pacificus): Project update
    • Tagging (pp 253-306, pdf 1.4 MB)
      • Portside sampling for recovered PIT tags in Pacific halibut
      • Tagging studies
      • Recoveries of double-tagged fish and PIT tag loss rate
      • Possible causes of low PIT tag recovery rates in 2004
      • Assessing seasonal migration of adult Pacific halibut along the Aleutian Chain using Pop-up Archival Transmitting (PAT) tags
      • Using Pop-up Archival Transmitting (PAT) tags to study seasonal migration timing in the Gulf of Alaska
    • Survey results and analysis (pp. 307-380, pdf 1.3 MB)
      • 2005 Standardized stock assessment survey
      • Prior Hook Injuries:  Results from the 2005 IPHC SSA and NMFS surveys
      • Age distribution of Pacific halibut in IPHC stock assessment setline surveys
      • Cruise report for the 2005 NMFS Bering Sea trawl survey
      • Size and age composition of Pacific halibut in NMFS Bering Sea shelf trawl surveys
      • Cruise report for the 2005 NMFS Gulf of Alaska trawl survey
      • NMFS trawl survey abundance estimates, distribution, and age composition of Pacific halibut in the Gulf of Alaska

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