1999 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
  • Staff Recommendations for 1999/2000 Research and Assessment (pp. 1-26, pdf 413K)
• Section 2 - The Fishery
  • Removals (pp. 27-68, pdf 688K)
    • 1999 Commercial fishery and regulation changes
    • 1999 Sport fishery
    • Wastage in the 1999 Pacific halibut fishery
    • Estimates of personal use for 1999
    • Retention of sublegal halibut in the Area 4E CDQ fishery
    • Preliminary estimates of Pacific halibut imported to North America from the western Pacific Ocean
  • Sampling and Analysis (pp. 69-106, pdf 520K)
    • Commercial catch sampling
    • Age composition of the commercial halibut catch for 1999
    • Impacts of an extension to the IPHC commercial fishing season
      • Part I. Biological issues
      • Part II. Report from the interagency work group meeting on the implications of extending the halibut season
    • New estimates of the sport catch of Pacific halibut in Canada based on the DFO survey of recreational fishing in Canada
    • Seabird observations and bycatch reported by fishermen to IPHC samplers in Alaskan and Canadian ports in 1999
  • Population Assessment (pp. 139-158, pdf 743K)
    • Assessment of the Pacific halibut stock in 1999 (pp. 107-138, pdf 393K)
    • Estimates of reductions in halibut recruitment due to bycatch
    • Alternative methods of smoothing mean weight at age
    • Bayesian approaches to the analysis of uncertainty in the stock assessment of Pacific halibut
• Section 3 - Bycatch
  • Catch and Mortality (pp. 159-190, pdf 436K)
    • Incidental catch and mortality of Pacific halibut, 1962-1999
    • Results of the 1998 and 1999 Bering Sea trawl fishery's Prohibited Species Donation (PSD) program
    • The 1999 groundfish fishery off Alaska:  Groundfish catches, halibut bycatches, and other information
    • Changes to halibut bycatch management in 1999
  • Research and Analysis (pp. 191-246, pdf 667K)
    • Pacific halibut Discard Mortality Rates (DMRs) in the 1990-1998 Alaskan groundfish fisheries, with recommendations for monitoring in 2000
    • Development of a dichotomous key for determining viability of Pacific halibut
    • Tests of flexible halibut excluders for trawl groundfish fisheries
• Section 4 - Biological Research
  • General (pp. 247-296, pdf 1.1M)
    • Halibut, climate and fisheries oceanography
    • 1999 Chalky fish study
    • Stable isotope analysis of Pacific halibut otoliths
    • Comparison of break-and-burn and break-and-bake aging techniques on halibut otoliths
    • Halibut otolith exchanges between the IPHC and Alaska Department of Fish and Game, 1991-1998
  • Survey Results (pp. 337-362, pdf 1.5M)
    • 1999 Standardized stock assessment survey (pp. 297-336, pdf 1.3M)
    • Cruise report for the 1999 NMFS Bering Sea trawl survey
    • Cruise report for the 1999 NMFS Gulf trawl survey
    • Catalog of IPHC setline survey data, 1963-1999
    • Prior Hook Injuries (PHI):  Results from the 1999 Surveys
  • Experimental Fishing Projects and Tagging (pp. 363-384, pdf 5.1M)
    • 1998-99 Experimental fishing - a winter/spring comparison of bait size and type
    • Grid survey design experiment
    • Tagging studies
    • Sport tagging program