水産資源管理談話会報

第40号（財）日本鯨類研究所
2007年

資源管理研究センター
8月

翻訳・公表希望者は以下の手続きとり、著者の許可を得た上で翻訳・公表する。
1. 翻訳・公表希望者は文章（FAX、手紙）で著者、表題および会報の号を明記し、資源管理談話会事務局を通じて要請し、著者の許可を得て翻訳・公表する。
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目次

お知らせ

REPORT OF THE 57TH MEETING OF THE
INTERNATIONAL WHALING COMMISSION’SSCIENTIFIC COMMITTEE

Luis A. Pastene

・・・

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第58回IWC科学委員会報告

後藤睦夫

・・・

5

スケトウダラ資源調査への音響資源調査の導入

本田・・・

9

スケトウダラ太平洋系群および日本海北部系群の資源変動について

船本鉄一郎

聡・・・・25

第52回資源管理談話会
2005年10月14日

REPORT OF THE 57TH MEETING OF
THE INTERNATIONAL WHALING COMMISSION’S SCIENTIFIC COMMITTEE
Luis A. Pastene
Institute of Cetacean Research,
Toyomi-cho 4-5, Chuo-ku,
Tokyo 104-0055, JapanINTRODUCTION
The International Convention for the Regulation of Whaling was signed in Washington D.C.
on 2 December 1946. The Convention includes eleven Articles and a Schedule. The main
objective of the Convention as set out in the last paragraph of its Preamble is “to provide forthe proper conservation of whale stocks and thus make possible the orderly development ofthe whaling industry”. The Convention gave origin to the International Whaling Commission(IWC) in 1948, which has its secretariat office at Cambridge, United Kingdom.
The IWC is composed of 66 country members (as of 21 March 2006). The IWC has a
Scientific Committee, a Conservation Committee, a Technical Committee and a Finance andAdministration Committee as well as Aboriginal/subsistence and infractions sub-committees.
The IWC convenes annual meetings to evaluate the current status of the different stocks oflarge whales and to make determinations on commercial and aboriginal whaling as well other
determinations on management and conservation of these resources. The committees and subcommittees meet prior to the Commission meeting so that the Commission is able to makemanagement and conservation determinations taking account of the reports of its committees
and sub-committees, particularly the report of the Scientific Committee, which has theresponsibility to assess the population status of different stocks and develop management
procedures for different kind of whaling operations.
The objective of this paper is to report on the 57th meeting of the IWC Scientific Committee(Committee).

PLACE AND DATE OF THE MEETINGThe meeting was held at the Lotte Hotel, Ulsan, Republic of Korea, from 30 May to 10 June.
The meeting was chaired by Douglas DeMaster of the United States.
PARTICIPANTS AND DOCUMENTS

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A total of 190 scientists participated in the meeting: 139 government delegates from 31countries (27 from Japan); 44 invited participants; one non-member government observer;
five from international organizations; one observer. Five members from the IWC secretariat
and five interpreters also participated. A total of 224 scientific documents were available tothe meeting, 22 submitted by Japanese scientists.

MEETING SCHEDULE
Date30 MayMeeting
Plenary session

31 May1-7 June

Initial meeting of subcommitteesMeetings of sub-committees

8-10 June

Plenary sessions

11 JuneConvenors meeting

Content/activity
Introductory items of theagenda Read documents
Election of chair; review
agenda and documents
Completion of the agenda andreportCompletion of the agenda andreport
Editorial work of the report;
specify priorities for the next
meeting,
SUB-COMMITTESThe following sub-committees and working groups met during the 57th Committee meeting:
Revised Management Procedure (RMP), which has as its main task to refine the Revised
Management Procedure (RMP) for baleen whale species and make progress on some specificimplementations of this procedure on some specific stocks; Aboriginal Whaling Management
Procedure (AWMP) which has as its main task the development of a management procedure
for aboriginal whaling and to determine catch quotas for some specific whaling cases;
Bowhead, Right and Gray whales (BRG) with the main task of assessing the current
population status of bowhead, right and gray whales; In-depth Assessment (IA) which
evaluates the status of populations of minke whales species; Southern Hemisphere Whale
Stocks (SH), engaged in the assessment of populations of the Southern Hemispherehumpback and blue whales; Stock Definition (SD) which discusses alternative definitions ofstocks for management purposes; Estimation of By-Catch (BC) in charge of developing
methods for estimating non-natural mortality of large whales (apart from direct catches);
Environmental Concerns (E), which is in charge of evaluating the impact of environmental
changes on cetaceans, cetacean-fisheries interactions and health problems in cetaceans; Small
Cetaceans (SM), which evaluates the population status of some specific species of small
cetaceans; Whale Watching (WW), which has the specific task of developing regulations forwhale watching activities; DNA Testing (DNA), which discusses genetic techniques todevelop and refine DNA registers with forensic capability for large whales and ScientificPermits (SP), which has the responsibility to review results derived from special permit
catches and new research proposals that involve the catch of whales.

2The report of each of these sub-committees and working groups are discussed and adopted
during the plenary sessions of the Committee.

MAIN RESULTS OF THE 2005 COMMITTEE MEETING
Revised Management Procedure
Apart from some further work required on some general issues focused on refining the RMPe.g. the adoption of guidelines and requirements for implementing the RMP, the Committee
completed the pre-implementation assessment for western North Pacific Bryde’s whale andthe Committee recommended that the Implementation of the RMP on this resource cancommence. There will be two intersessional workshops and two annual meetings before theImplementation can be completed e.g. a catch quota for commercial whaling for this Bryde’s
whale stocks will be determined by the 2007 annual meeting. The Committee also started thepre-implementation assessment for North Atlantic fin whales.
Aboriginal Whaling Management Procedure
Block catch quotas for aboriginal whaling were determined previously for several species forthe period 2003-2007. Each year the Committee reviews new information available mainly on
stock structure and abundance, and determines whether or not the previously determined
quotas require revision.
Regarding aboriginal whaling in Greenland for common minke and fin whales, theCommittee reviewed information on abundance and stock structure provided by Danish
scientists. The Committee considered this information as inadequate and therefore it wasunable to provide satisfactory management advice and safe catch limits. Regarding aboriginal
whaling in St. Vincent and the Grenadines for humpback whales, the Committee reviewed
new information on stock structure of this species and agreed that catch limits of 20 animals
for the period 2003-07 will not harm the stock.
Bowhead, Right and Gray Whales
Recent analyses of genetic data presented to the Committee had suggested the possibility thatthe Bering-Chukchi-Beaufort (BCB) stock of bowhead whales is composed of more than one
stock. The Committee reviewed the new information on stock structure and concluded that nochange is needed to the current block quota for this stock for the period 2003-07. Considering
the possibility of multiple-stocks the Committee recommended that an Implementation
Review focusing on stock structure should be conducted in 2007 and agreed on a timeline inpreparation for such review. Regarding the eastern North Pacific gray whales the Committee,
based on the current information, concluded that no change is needed to the current block
quota for 2003-07. An Implementation Review is scheduled for this stock in 2009.
In-depth assessment of whale stocks
One of the main topics of the Committee in recent years has been the attainment of actualized
estimates of abundance of Antarctic minke whales. Preliminary estimations of abundance forthis species were available for the 2005 meeting, and the Committee examined the possible
reasons for the differences observed in the estimations between the second circumpolar
surveys (CPII) and the third circumpolar surveys (CPIII), which were substantially lower forthe latter. One of the possible reasons discussed was a greater sea ice expansion in recent

3years which could have made minke whales less detectable in recent surveys. The highest
priority for the Committee next year meeting will be to produce an agreed abundance estimateof Antarctic minke whales. The Committee also started the in-depth assessment of the stockof the Sea of Japan of common minke whale (J-stock). The Committee examined various
pieces of information on distribution and abundance, stock structure, biological parametersand catch history. The Committee will continue with the assessment of this stock in the
coming years.
Southern Hemisphere Whale Stocks
The Committee continued with the in-depth assessment of Southern Hemisphere humpbackwhales and agreed to complete this assessment during the 2006 annual meeting. To facilitate
this, the Committee agreed to convene an intersessional workshop. The Committee also
agreed to begin a comprehensive assessment of the Southern Hemisphere blue whale in 2006.
Special Permit
Three main topics were addressed by the Committee this year: a) review of results fromexisting research programs; the 2004/05 JARPA survey, the 2004 JARPN II survey and the2004 Iceland survey; b) following established guidelines the Committee reviewed the newJARPA II research program and c) the Committee accepted the term of references andproposed agenda for the IWC sponsored JARPA review meeting to be held in December 2006.
Election of officers
Arne Bjorge (Norway) was elected to replace Doug DeMaster (US) as chair of the ScientificCommittee for a new three years term. Deborah Palka (US) was elected to replace Arne
Bjorge as vice-chair of the Scientific Committee for a new three years term.
2006 Scientific Committee Meeting
The 58th meeting of the Committee in 2006 will held in St. Kitts and Nevis between 26 May
and 6 June.

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