 | | 1991 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
for e-mail addresses or by phoning the Seattle office at (206) 634-1838.
(note: blank pages have been omitted)
 | The Fishery (pp. 1-37, pdf
1.1 MB)
 | 1991 Commercial fishery |
| Sport fishery |
| Wastage in the Pacific halibut fishery |
| Commercial catch sampling |
|
| Stock Assessment (pp.
39-98, pdf 1.9 MB)
| Population assessment
 | Population assessment, 1991 |
| Population assessment, 1991 Technical
supplement |
| Halibut subsistence catches |
| Assessment methods |
| Features of Area 2A age composition data |
| Age composition and size at age of the
commercial fishery for 1991 |
|
| CPUE Studies (pp. 99-166,
pdf 1.9 MB)
| A progress report on the use of hook timers on
longline gear |
| An age-structured Kalman Filter for Pacific
halibut stock assessment |
|
| Biomass Estimates
| Validation of the IPHC length-weight
relationship for halibut |
| Re-examination of halibut growth and the size
limit |
| Stock abundance estimation using depth
dependent trends and spatially correlated variation |
| Estimates of halibut abundance in Area 2A from
NMFS trawl surveys |
| Trends in abundance of juvenile halibut
indicated by NMFS trawl surveys |
| Documentation of long-term trends in size at
age in the commercial catch |
| Retrospective catch-age analysis: Implications
on assessment of harvesting policies |
| Using data on biomass and fishing mortality in
stock production modeling of flatfish |
| Mark-recapture methods for Pacific halibut
assessment: A feasibility study conducted off Newport, Oregon |
|
|
| Bycatch (pp. 167-230, pdf 2.7
MB)
| Incidental catch and mortality of Pacific
halibut: through 1991 |
| The 1991 Alaska groundfish fishery:
Groundfish catches, halibut bycatches, and bycatch rates |
| Revised estimates of Pacific halibut discard
mortality rates in the 1990 groundfish fisheries off Alaska |
| Comparison of day and night bycatch rates in Bering
Sea domestic trawl fisheries |
| Canadian domestic trawl observer program |
| Report of the halibut bycatch work group |
| Status of bycatch management planning |
|
| Biological Research (pp. 231-305, pdf
2.3 MB)
| General studies
| Underwater video observations of fish behavior
to baited circle hooks |
| Underwater observations of interactions between
Pacific halibut and bottom trawls |
| Stock identification using DNA analysis |
| Parasites and Pacific halibut |
| Halibut culture project - Pacific Biological
Station |
| Results of Pacific halibut rearing experiments
at the University of Washington |
| Collection of halibut gonads in Area 2A |
| Comparison of age and length compositions
between sport and commercial fisheries in Area 2A |
| A report on the use of the IPHC photography
database |
|
| Otolith Studies
| Estimation of halibut body size from otolith
size |
| Estimating sex of halibut using Fourier Shape
Analysis of otoliths |
| Elemental composition of halibut otoliths |
| A comparison of classifier systems for
automated aging of halibut otoliths |
| 1991 Otolith collection cruises |
|
| Tagging studies
| Tagging studies |
| Movement of juvenile halibut in IPHC Regulatory
Areas 2 and 3 |
| Age dependent tag recovery analysis of Pacific
halibut data |
|
|
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