2006 IPHC Report of Assessment and Research Activities

Report of Assessment and Research Activities 2007 Contents

IPHC research program: Review of 2007 projects and proposals for 2008 - IPHC Staff

Fishery Removals

	2007 commercial fishery and regulation changes - Heather L. Gilroy, Lara M. Hutton, and Kirsten A. Gravel
	2007 sport fishery - Calvin L. Blood
	Wastage of legal-sized halibut in the 2007 Pacific halibut fishery - Heather L. Gilroy
	Re-estimation of sublegal discard mortality in the halibut fishery - Heather L. Gilroy and William G. Clark
	The personal use harvest of Pacific halibut in 2006 - Gregg H. Williams
	Retention of sublegal halibut in the Area 4D/4E CDQ fishery: 2007 harvests - Gregg H. Williams

Sampling and analysis

	Commercial catch sampling - Lara M. Hutton and Kirsten A. Gravel
	Age distribution of the commercial halibut catch for 2007 - Joan E. Forsberg

Population Assessment

	International Pacific Halibut Commission Stock Assessment Workshop - IPHC staff
	Report on the 2006 Assessment and Harvest Policy of the International Pacific Halibut Commission - RICC Francis
	UM Independent System for Peer Reviews Consultant Report on: International Pacific Halibut Commission (IPHC) stock assessment and harvest policy review - Paul A. Medley
	Staff response to the CIE reviewers’ reports - William G. Clark, Steven R. Hare, and Raymond A. Webster
	Assessment of the Pacific halibut stock at the end of 2007 - William G. Clark and Steven R. Hare
	Effect of station depth distribution on survey CPUE - William G. Clark
	Effect of hook competition on survey CPUE - William G. Clark
	Effect of migration on achievement of proportional harvest under a system of survey apportionment of total catch - William G. Clark

	Comparison of setline and trawl survey catch rates in different areas - William G. Clark
	Questions about fishery-survey interactions - Raymond A. Webster and William G. Clark
	Modeling migration distance using the IPHC PIT tag-recovery data - Raymond A. Webster, William G. Clark and Joan Forsberg
	Analysis of PIT tag recoveries through 2007 - Raymond A. Webster
	2007 IPHC harvest policy analysis: past, present, and future considerations - Steven R. Hare and William G. Clark
	New estimates of bottom area in IPHC regulatory areas - Steven R. Hare

Incidental Catch of Halibut

	Incidental catch and mortality of Pacific halibut, 1962-2007 - Gregg H. Williams
	Pacific halibut discard mortality rates in the 2006 open access and CDQ groundfish fisheries, and recommendations for discard mortality rates needed for monitoring halibut bycatch in 2008 CDQ fisheries - Gregg H. Williams
	Halibut bycatch limits in the 2007 Alaska groundfish fishery - Gregg H. Williams
	The Bering Sea trawl fishery Prohibited Species Donation Program: Results from 1998-2007 - Gregg H. Williams

Biological research

General

	Examination of genetic population structure in spawning adults of Pacific halibut: laboratory and field work completed in 2007 - Lorenz Hauser, Timothy Loher, James Rhydderch and Lyndsay Newton
	Oceanographic monitoring on the IPHC setline survey in 2007 - Lauri L. Sadorus and Steven R. Hare
	Estimating halibut hooking success using DIDSON sonar – Stephen M. Kaimmer and Stephen Wischniowski
	2007 hook size and spacing experiment - Stephen M. Kaimmer and Bruce M. Leaman
	2007 dogfish mischmetal experiments - Steve Kaimmer and Alan Stoner
	*Homogeneity test for the Pacific sleeper shark (Somniosus pacificus): Project update* - Stephen Wischniowski, Trent Garner, Caroline Cameron

Tagging

	Portside and survey vessel sampling for recovered PIT tags in Pacific halibut - Joan E. Forsberg
	Tagging studies - Joan E. Forsberg
	Characterization of seasonal onshore-offshore migration timing, and active spawning depth and period of Gulf of Alaska halibut, with evidence of possible skipped spawning - Timothy Loher
	Early-spring dispersion of halibut from Areas 2A and 2B, evaluated via Pop-up Archival Transmitting (PAT) tags - Timothy Loher and Calvin Blood
	Assessing seasonal migration and putative spawning location of adult Pacific halibut in the southeast Bering Sea using Pop-up Archival Transmitting (PAT) tags - Timothy Loher and Andy Seitz
	*Use of archival tags to study migration and behavior of male and pre-recruit Pacific halibut (Hippoglossus stenolepis): phase I, development of surgical techniques* - Timothy Loher and Renee Rensmeyer

Surveys

	2007 standardized stock assessment survey - Eric Soderlund, Claude L. Dykstra, Tracee Geernaert, Erica Anderson, and Aaron M. Ranta
	Prior hook injuries: results from the 2007 IPHC SSA and NMFS surveys - Stephen M. Kaimmer and Richard C. Leickly
	Age distribution of Pacific halibut in the 2007 IPHC stock assessment setline survey - Joan E. Forsberg
	Cruise report for the 2007 NMFS Bering Sea trawl survey - Lauri L. Sadorus and Robert Lauth
	Size and age composition of Pacific halibut in NMFS Bering Sea shelf trawl surveys - Lauri Sadorus, Robert Lauth, and Aaron M. Ranta
	Cruise report for the 2007 NMFS Gulf of Alaska trawl survey - Lauri L. Sadorus and Mark E. Wilkins
	Abundance, distribution, and age composition of the Pacific halibut as estimated by the NMFS Gulf of Alaska trawl survey - Lauri L. Sadorus, Mark E. Wilkins, and Aaron M. Ranta

Aging and Otoliths

	Using otolith chemistry to determine halibut nursery origin: progress in 2007 - Timothy Loher and Stephen Wischniowski
	Detecting, interpreting, and measuring false annuli in Pacific halibut ages one to four from the Bering Sea - Stephen Wischniowski and Timothy Loher
	*Technique development for age determination of the Pacific sleeper shark (Somniosus pacificus)* - Stephen Wischniowski

Cover by Forsberg

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