1997 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.

  • Section 1 - Contents (pp. 1-50, pdf 2.2 MB)
    • Staff Recommendations for Research and Assessment: 1997/1998 and 1998/1999
  • Section 2 - The Fishery
    • Removals
      • 1997 Commercial fishery and regulation changes
      • Sport fishery
      • Wastage in the Pacific halibut commercial fishery
      • 1997 Estimates of personal use halibut
    • Sampling and Analysis (pp. 51-80, pdf 1.3 MB)
      • Commercial catch sampling
      • Age composition and size at age of the commercial fishery for 1997
      • Discussion paper for an Alaskan Weighmaster Program
    • Population Assessment (pp. 81-152, pdf 2.3 MB)
      • Population assessment, 1997 
      • Population assessment, 1997 Technical Supplement
      • Stock assessment methodology: Model documentation
    • Analysis (pp. 153-210, pdf 2.3 MB)
      • Relative fishing power of C-Hooks and J-Hooks
      • Coastwide distribution of exploitable biomass according to 1997 setline surveys
      • Re-evaluation of the 32-inch commercial size limit
      • A proposed method for setting Area 4 and Area 3B catch limits
  • Section 3 - Bycatch
    • Catch and Mortality (pp. 211-282, pdf 2.9 MB)
      • The 1997 groundfish fishery off Alaska: Groundfish catches, halibut bycatches, and bycatch rates
      • Incidental catch and mortality of Pacific halibut: 1962-1997
      • Pacific halibut discard mortality rates in the 1990-1996 Alaskan groundfish fisheries, with recommendations for monitoring in 1998
      • Halibut discard mortality rates (DMRs) in the 1996 Bering Sea hook & line cod fishery
      • A summary of halibut bycatch information for the British Columbia bottom trawl fishery
      • Pacific halibut bycatch in IPHC Area 2A: Bycatch rates and current estimates of bycatch mortality
    • Research and Analysis (pp. 283-314, pdf 1.7 MB)
      • Mean weight and length of halibut bycatch in the 1996 groundfish fisheries off Alaska
      • Review of Alaska Fishery Development Foundation bycatch research
      • NMFS-authorized distribution of halibut bycatch in the groundfish fisheries off Alaska to economically disadvantaged individuals
      • Halibut discard condition criteria: New revisions for 1998
      • Halibut bycatch and mortality: Database management and data processing
  • Section 4 - Biological Research
    • General (pp. 315-338, pdf 1.4 MB)
      • Climate change and halibut biology - Year One progress report
      • Halibut early life history study: Project status
      • An investigation into the occurrence and causes of the chalky condition in Pacific halibut
    • Survey Results (pp. 339-398, pdf 3.0 MB)
      • 1997 Setline grid survey
      • Preliminary cruise report for the 1997 NMFS Aleutian Islands triennial trawl survey
      • Observations of prior hook injuries on the 1997 stock assessment surveys
    • Tagging studies
      • Tagging studies
      • Sport tagging program

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