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Development of Assessment Model for Western Pacific YellowfinThis small project will convene a workshop to develop specifications of an assessment model for western Pacific yellowfin which will incorporate spatially stratified catch and effort, size-frequency, and tagging data. Scientists from Japan, South Pacific Commission, United States, Australia and Canada have agreed to participate. The Workshop will be convened in November 1993 and will make recommendations to the next Western Pacific Yellowfin Working Group meeting.
Dr. John Sibert, Program Manager
Pelagic Fisheries Research Program
Joint Institute for Marine and Atmospheric Research (JIMAR)
University of Hawaii at Manoa
1000 Pope Road, MSB 612
Honolulu, Hawaii 96822
Phone (808) 956-4109
FAX (808) 956-4104
Dr. Pierre Kleiber
National Marine Fisheries Service
2570 Dole Street
Honolulu, Hawaii 96822
Phone (808) 943-1235
FAX (808) 943-1290
Funding was received at the University in August 1993, and the work was largely complete in November.
Various countries participating in the large yellowfin fishery in the central and western Pacific collect a heterogeneous set of fishing statistics. These data include estimates of catch, fishing effort and the size composition of the catch. Members of the Western Pacific Yellowfin Working Group (WPYWG) have attempted to analyze these data using existing methods. (The WPYWG is composed of scientists from the countries that operate fishing fleets in the western Pacific, the island states of the region, and the regional organizations.) The data are not amenable to these methods and attempts to manipulate the data in various ways to make them suitable for analysis have proven futile.
In cooperation with the WPYWG, a small workshop was convened in November 1993 to design specifications for an analytical method suited to the data. The workshop was attended by scientists form Australia, Canada, Japan, New Caledonia (South Pacific Commission) and United States. The group recommended an age-structured model that would also include simplified spatial structure and movement dynamics among seven large areas covering the region from 40° S to 40° N and from 150° W to the coast of Asia and Australia. The model will emphasize the use of the size composition data, growth rates and tag-recapture data to characterize the population. If implemented as envisaged, this procedure will provide researchers with a unique stock assessment tool which will also address questions of local depletion, "safe" levels of exploitation, and interaction between fisheries in Hawaii and the central Pacific. A full proposal to develop the new procedure was in preparation by the workshop participants and was presented to August 1994 Western Pacific Yellowfin Working Group meeting in Koror, Palau. The Working Group made some suggestions and a revised proposal was prepared and submitted to the PFRP by the South Pacific Commission on behalf of the Working Group.
This page updated August 16, 2006