1993 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.

  • The Fishery (pp. 1-57, pdf 2.1 MB)
    • 1993 Commercial fishery
    • Sport fishery
    • Allocation of Pacific halibut among sport and commercial fisheries in Alaska -  Has the time come?
    • Wastage in the Pacific halibut commercial fishery
    • Commercial catch sampling
    • Precision of British Columbia sport catch estimates based on postal surveys of residents and visitors
    • Improvements in Canadian sport harvest and biological data
    • Personal use in Alaska
    • Age composition and size at age of the commercial fishery for 1993
  • Population Assessment (pp. 59-131, pdf 1.9 MB)
    • Stock Assessment
      • Population assessment, 1993
      • Population assessment, 1993 Technical supplement
      • Area 2A Assessment supplement
    • Data Analysis and Development (pp. 133-165, pdf 1.2 MB)
      • Spatial analysis of halibut CPUE
      • Effects of IVQ on CPUE
      • Alternative sampling grids for the setline surveys
      • Progress on regularizing IPHC historical data
      • Implications of winter fishing for Pacific halibut
  • Bycatch (pp. 167-231, pdf 2.3 MB)
    • Byatch and Mortality 
      • The 1993 Alaska groundfish fishery: Groundfish catches, halibut bycatches, and bycatch rates
      • Incidental catch and mortality of Pacific halibut: 1962-1993
    • Bycatch management
      • Status of bycatch management planning
      • A summary of observer data collected in 1993 in the halibut (Hippoglossus stenolepis) bycatch study in British Columbia
      • Review of rules and amendments regulating Alaskan groundfish fisheries
    • Research and Analysis (pp. 233-297, pdf 2.1 MB)
      • Pacific halibut discard mortality rates in the 1990-1992 groundfish fisheries off Alaska, with recommendations for 1994
      • Recommendations for 1994 pre-season assumed discard mortality rates for halibut bycatch
      • Estimates of Pacific halibut bycatch mortality in U.S. Domestic fisheries in IPHC Area 2A
      • Longline tagging for discard mortality rates
      • Effects of sorting technique on survival of halibut discarded from a factory trawler
      • Spatial and temporal variation of Pacific halibut bycatch in Pacific cod domestic fisheries in the Bering Sea and losses inflicted to the halibut fishery
  • Section 4 - Biological Research (pp. 299-359, pdf 1.6 MB)
    • General
      • Parasites and Pacific halibut
      • Comparison of surface and break/burn age readings
      • Documentation and estimation of bottom and habitat areas for Pacific halibut in Area 2A
    • Surveys 
      • 1993 Setline grid survey
      • Results of the 1993 NMFS Bering Sea trawl survey
    • Tagging studies
      • Tagging studies
      • Experiment with tagging of sport-caught halibut
      • Sample size for longline discard survival estimates

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