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2004 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.
 | Cover by Forsberg (pdf 108KB) |
| Contents (pp. 1-8, pdf
142KB) |
| Section 1 (pp. 9-30, pdf
258KB)
 | IPHC research program: Review
of 2004 projects and proposals for 2005 |
|
| Section 2 - The Fishery (pp.
31-76, pdf 294KB)
| Removals
 | 2004 Commercial fishery and regulation changes |
| 2004 Sport Fishery |
| Wastage in the 2004 Pacific halibut fishery |
| Revised estimates of the 2004 personal use harvest,
including new estimates for the subsistence fishery off Alaska |
| Retention of sublegal halibut in the Areas 4D/4E
CDQ fishery: 2004 harvests |
|
| Sampling and Analysis
| Commercial catch sampling |
| The presence of swivels on snapped hook gear in
the halibut fishery |
| Age distribution of the commercial halibut catch
for 2004 |
|
|
| Section 3a - Population Assessment (pp.
77-148, pdf 690KB)
| Simulations studies of mark-recapture estimates |
| Estimates of length-specific commercial selectivity
from historical marking experiments |
| Assessment of the Pacific halibut stock at the end
of 2004 |
| Analysis of the constant harvest rate policy for
2005 |
| Analysis of the 1985 hook spacing experiment |
| Updated simulation analysis of the CCC harvest
policy with separate accounting of males and females (pp.
149-210, pdf 793KB) |
| Yield per recruit analysis for a sex specific
halibut assessment model |
| Investigation of the role of fishing in the Area 4C
CPUE decline |
| Preliminary estimates based on the 2004 PIT tag
recoveries |
|
| Section 3b - Bycatch (pp. 211-242, pdf
1.5 MB)
| Incidental catch and mortality of Pacific halibut,
1962-2004 |
| Pacific halibut discard mortality rates in the 2003
Alaskan groundfish fisheries, with recommendations for
monitoring CDQ fisheries in 2005 |
| The Bering Sea trawl fishery Prohibited Species
Donation Program: Results from 1998-2004 |
|
| Section 4 - Biological Research
| General I (pp. 243-298,
pdf 2.4 MB)
| Cruise report for 2003-04 southeast Alaska
juvenile Pacific halibut (Hippoglossus stenolepis) collection
charters |
| Using otolith chemistry to
determine halibut nursery origin: an initial test of
concept |
| Cruise report for 2004 IPHC winter charters |
| Deployment of the Seacat water column profiler
in 2004 |
|
| General II (pp. 299-344, pdf
2.6 MB)
| Investigating seasonal migration of adult
Pacific halibut (Hippoglossus stenolepis) along the Aleutian
Chain using pop-up satellite transmitting archival tags |
| Thermal habitat preferences of Pacific halibut
and the potential influence of hydrographic variability on a local
coastal fishery: project progress report |
| A project to test the use of digital video for
monitoring the compliance of seabird avoidance devices and seabird
mortality in halibut longline fisheries |
| Analysis of halibut gonad staging |
| Occurrence of double-ring patterns in halibut
otoliths |
| Incidence of crystallized otoliths from the
2000 to 2002 IPHC setline and NMFS trawl surveys |
| Description of a Pacific halibut chronology of
bomb radiocarbon from 1944-1981 and a validation of ageing methods |
| Technique development and age determination of
the Pacific sleeper shark (Somniosus pacificus) |
| Homogeneity test for the Pacific sleeper shark
(Somniosus pacificus) |
|
| Tagging (pp 345-384,
pdf 4.8 MB)
| PIT tagging in 2004 |
| Review of information on PIT tag loss and
detection rates |
| Recoveries of double-tagged fish and PIT tag
loss rate |
| Portside sampling for recovered PIT tags in
Pacific halibut |
| Tagging studies |
|
| Survey results and analysis (pp.
385-458, pdf 3.3 MB)
| 2004 Standardized stock assessment survey |
| Prior Hook Injuries (PHI): Results from
the 2004 IPHC SSA surveys and NMFS Bering Sea trawl surveys |
| Analysis of prior hooking injury (PHI)
classifications on the IPHC setline survey and the effects of PHIs
on the length at age of halibut |
| Cruise report for the 2004 NMFS Bering Sea trawl survey |
| Size and age composition of Pacific halibut in
NMFS Bering Sea shelf trawl surveys |
| Results from 2003 seabird occurrence data |
| Age distribution of Pacific halibut in IPHC
stock assessment setline surveys |
|
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