1998 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. 1-6, pdf 119 KB)
  • Section 2 - The Fishery
    • Removals
      • 1998 Commercial fishery and regulation changes
      • Sport fishery
      • Wastage in the Pacific halibut commercial fishery
      • 1998 Estimates of personal use halibut
    • Sampling and Analysis (pp. 65-120, pdf 2.0 MB)
      • Commercial catch sampling
      • Age composition and size at age of the commercial fishery for 1998
      • Preliminary results of seabird observations and bycatch reported by fishermen to IPHC samplers in Alaskan and Canadian Ports in 1998
    • Population Assessment
      • Assessment of the Pacific halibut stock in 1998 
      • The effects of an erroneous natural mortality rate on a simple age-structured stock assessment (ABSTRACT)
      • Area 3B and Area 4 Pacific halibut catch limits, 1999
  • Section 3 - Bycatch
    • Catch and Mortality (pp. 121-156, pdf 1.4 MB)
      • Incidental catch and mortality of Pacific halibut: 1962-1998
      • Progress report on the halibut donation program for the Bering Sea trawl fishery
      • The 1998 groundfish fishery off Alaska: Groundfish catches, halibut bycatches, and bycatch rates
      • Changes to halibut bycatch management in 1998
    • Research and Analysis (pp. 157-206, pdf 1.7 MB)
      • Pacific halibut discard mortality rates (DMRs) in the 1990-1997 Alaskan groundfish fisheries, with recommendations for monitoring in 1999
      • Halibut discard mortality rates (DMRs) in the 1997 BSAI hook & line Pacific cod fishery, with recommendations for 1998 management
      • Result from the 1995 trawl tagging charter investigating mortality of discarded Pacific halibut
  • Section 4 - Biological Research
    • General (pp. 207-248, pdf 1.4 MB)
      • Climate change and halibut biology - Year Two progress report
      • Completion of halibut early life history project 
      • Continuing the investigation into the occurrence and causes of the chalky condition in Pacific halibut
      • Genetic variation in Pacific halibut (Hippoglossus stenolepis) detected with novel microsatellite markers
      • Evaluation of maintaining the IPHC Closed Area in the Bering Sea 
    • Survey Results (pp. 249-318, pdf 3.4 MB)
      • 1998 Setline grid survey
      • IPHC setline survey grid design changes 1960-1998 
      • Cruise report for the 1998 NMFS Bering Sea trawl survey
      • Cruise report for the 1998 NMFS west coast trawl survey
      • Prior hooking injuries found on halibut in the 1998 surveys
    • Experimental Fishing Projects (pp. 319-348, pdf 1.1 MB)
      • Experiments with a bird avoidance device during International Pacific Halibut Commission longline surveys
      • 1998 Experimental fishing
    • Tagging studies
      • Tagging studies
      • Sport tagging program

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