2001 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. For the most up-to-date information, please contact the author by visiting the staff directory or by phoning the Seattle office at (206) 634-1838.

  • Cover by Forsberg (pdf 538K)
  • Section 1 - Contents (pp. 1-6, pdf 444K)
  • IPHC research program: Review of 2001 projects and proposals for 2002 (pp. 7-40, pdf 563K)
  • Section 2 - The Fishery
    • Removals (pp. 41-102, pdf 1.52MB)
      • 2001 Commercial fishery and regulation changes
      • Further examination of biological issues concerning an extended commercial fishing season
      • 2001 Sport fishery
      • Wastage in the 2001 Pacific halibut fishery
      • Estimates of personal use harvest for 2001
      • Retention of sublegal halibut in the Area 4E CDQ fishery: Results from 2001
      • History of Area 2 fisheries, management and assessments
    • Sampling and Analysis (pp. 103-118, pdf 495K)
      • Commercial catch sampling
      • Age distribution of the commercial halibut catch for 2001
  • Section 3a - Population Assessment (pp. 119-196, pdf 1.1MB)
    • Assessment of the Pacific halibut stock at the end of 2001 
    • Evaluation of the Pacific halibut harvest policy and medium term harvest projections
    • Effects of climate, stock size, and region on recruitment and growth of Pacific halibut
    • Comparison of fixed-hook and snap-hook CPUE
  • Section 3b - Bycatch (pp. 197-246, pdf 2.1MB)
    • Incidental catch and mortality of Pacific halibut, 1962-2001
    • The Bering Sea trawl fishery Prohibited Species Donation (PSD) program: Results from 1998-2001
    • Pacific halibut discard mortality rates in the 1990-2000 Alaskan groundfish fisheries, with recommendations for monitoring in 2002
    • Development and testing of halibut excluders for Alaska cod trawling
  • Section 4 - Biological Research
    • General (pp. 247-298, pdf 857K)
      • Deployment of the Seacat water column profiler in 2001
      • Chalky halibut investigations in 2001
      • Variance comparison for surface and break-and-burn ages
      • Seabird interactions with halibut longline gear:  Sources of variation in abundance and behavior
      • Development of a Geographic Information System
    • Tagging (pp 299-332, pdf 796K)
      • Pilot studies on the use of PIT tags in Pacific halibut
      • Analyzing mark-recapture data for Pacific halibut with a state space model
      • Tagging studies
    • Survey Results (pp. 333-376, pdf 1.35MB)
      • 2001 Standardized stock assessment survey
      • Cruise report for the 2001 NMFS Gulf of Alaska trawl survey
      • Cruise report for the 2001 NMFS Bering Sea trawl survey
      • Prior Hook Injuries (PHI):  Results from the 2001 IPHC SSA surveys and NMFS trawl surveys
    • Survey Analysis (pp. 377-428, pdf 1.48MB)
      • Comparison of setline survey CPUE in standard survey subareas and entire regulatory areas
      • NMFS trawl survey abundance estimates, distribution, and age composition of Pacific halibut in the Gulf of Alaska
      • Size and age composition of Pacific halibut in NMFS Bering Sea shelf trawl surveys
      • Density of legal-sized halibut in the eastern Bering Sea and coastwide distribution of exploitable biomass
      • Morphometric observations made on the 2001 Gulf of Alaska and Bering Sea NMFS trawl surveys
      • The elusive 82-cm halibut:  Measurement variation in IPHC setline surveys (pp. 429-450, pdf 602K)

For a free PDF viewer, please visit the Adobe website.