Papua New Guinea/SPC Tuna Tagging Project: PRFP linking to the bigger picture

Transcription

1 Papua New Guinea/SPC Tuna Tagging Project: PRFP linking to the bigger picture David Itano 1 Kim Holland 2 John Hampton 3 1 University of Hawaii, Pelagic Fisheries Research Program 2 Hawaii Institute of Marine Biology, University of Hawaii 3 Secretariat of the Pacific Commission, Oceanic Fisheries Programme

2 Tuna resources of the Western and Central Pacific: historical overview: South Pacific Commission programs Skipjack Survey and Assessment Programme (field operations) survey and stock assessment of WCPO skipjack and tuna baitfish resources for fisheries development and management Regional Tuna Tagging Programme emphasis on yellowfin tuna resource and assessment under rapidly increasing purse seine and longline exploitation Regional Tuna Tagging Project - Phase I: Papua New Guinea Oceanic Fisheries Programme / Secretariat of the Pacific Community and the National Fisheries Authority / PNG (six months total)

3 tagging platforms SSAP Hatsutori Maru #5 RTTP M/V Te Tautai PNG Tuna Tagging Project, Phase I M/V Soltai 6

4 pole-and and-line gear for conventional tagging adf

5 JAPAN 150 E Minami Tori Shima 160 E 170 E W 160 W 150 W Western and Central Pacific Research and Management HAWAII 140 W 130 W USA Mexico CNMI Wake Johnston 20 N Guam Marshall Islands 10 N Palau Federated States of Micronesia Palmyra Indonesia PNG Nauru Kiribati Howland & Baker Phoenix Islands Jarvis Line Islands 0 Solomon Islands Tuvalu Fiji W&F Tokelau Cook Islands Samoa Am Samoa 10 S Australia New Caledonia Vanuatu Tonga Niue French Polynesia Pitcairn Western and Central Pacific Fishery Commission (Secretariat of the Pacific Community)

6 current exploitation levels in WCPO > 1000 mt/year since 1999 increasing use of drifting (red( red) ) and anchored (green( green) ) FADs by Purse Seine fleets

7 recent exploitation levels Papua New Guinea EEZ 250,000 to 400,000 mt of tropical tunas per year

8 Phase I study area Northern Marianas Minami Tori Shima Wake Johnston Hawaii Philippines Guam Marshall Islands Palau Federated States of Micronesia Howland and Baker Palmyra Indonesia Papua New Guinea Nauru Kiribati Phoenix Jarvis Line Islands Australia New Caledonia Solomon Is Vanuatu Matthew & Tuvalu Fiji Wallis & Futuna Tokelau Cook Western Islands Samoa Am Samoa Tonga Niue F Bismarck archipelago and Solomon Sea

9 Bismarck archipelago and Solomon Sea 140 E 145 E 150 E 155 E 0 Manus Island Bismarck Sea New Ireland Papua New 05 S Guinea PAPUA NEW GUINEA New Britain Bougainville Solomon Sea 1000 (or so) anchored FADs

10 data time series Skipjack Survey and Assessment Programme Regional Tuna Tagging Project

11 PNG Phase I: tag types for different objectives conventional dart tags sonic transmitting tags data archiving tags

12 Hawaii sonic tagging research inter-fad movements LL Yellowfin & bigeye long-term residence Yellowfin & bigeye co-residence CO small vs large YFT R Oahu vertical behavior Honolulu FAD related catchability 20 km trophic relationships excursions away from FADs

13 Tag types and objectives sonic and archival tags surgical implantation

14 sonic receivers

15 experimental design Basic Hardware (PFRP) 50 VEMCO VR2 sonic tag receivers 150 V9 sonic pinger tags 120 V9P depth sensing sonic tags FAD related Objectives (size and species specific) residence time and movement rates diurnal vertical behavior and fine-scale arrival and departure rates inter-fad movements within FAD clusters examine schooling dynamics and synchronicity Related studies double tagging with geo-locating archival tags trophic studies via gut sampling and isotope analyses sonic monitoring of seamounts recapture rates on and off FADs

16 Cruise 1: receiver equipped FAD clusters Archival and sonic tag releases SKJ YFT BET Total V9 sonic alone V9P sonic alone LTD 1110 archival LTD 2410 archival MK9 archival V9 + LTD V9P + LTD V9 + LTD V9 + MK totals V9s used V9Ps used Sonic tag releases

17 initial data acquisition

18 PNG Phase I, and beyond PNG Cruise 2 March to June 2007 SPC plans for larger-scale tagging program Phase II extension to other areas of the WCPO Covering SE Asia to the Central Pacific Approach Funding: several donors targeted, some secured, WCPFC role Larger vessel required, multi-vessel approach possible, International collaboration, i.e. IATTC liaison with Eastern Pacific Ocean region Establish a Project Steering Committee, seek WCPF Commission endorsement Seek national collaboration/participation

19 the end