University of Hawai'i Pelagic Fisheries Research Program
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No. 11, December 2020 University of Hawai‘i Pelagic Fisheries Research Program By Paul Dalzell About the Author Paul Dalzell is a Fellow of the Royal Geographic Society and the former senior scientist and pelagic fisheries coordinator for the Western Pacific Regional Fishery Management Council, a position he held for more than two decades. Prior to joining the Council, he worked at the South Pacific Commission (now the Pacific Community) Disclaimer: The statements, findings and conclusions in this report are those of the author and do not necessarily represent the views of the Western Pacific Regional Fishery Management Council or the National Marine Fisheries Service (NOAA). © Western Pacific Regional Fishery Management Council, 2020. All rights reserved, Published in the United States by the Western Pacific Regional Fishery Management Council under NOAA Award # NA20NMF4410013. ISBN 978-1-944827-57-1 Cover art: PFRP Back and inside cover: David Itano photos. Contents List of Illustrations ..............................................ii 7.3 Role of Oceanography on Bigeye Tuna List of Tables .......................................................ii Aggregation and Vulnerability in the Hawai‘i List of Acronyms ..................................................ii Longline Fishery ...........................................14 1. INTRODUCTION ..............................................1 8. SELECT PROTECTED SPECIES PROJECTS ............15 1.1 Traditional Marine Resource 8.1 Comparing Sea Turtle Distributions Management in Oceania .................................2 and Fisheries Interactions in the Atlantic and Pacific ...................................................15 1.2 Contemporary Marine Resource Management of Pacific Pelagic Species ............3 8.2 Direct Tests of the Efficacy of Bait and Gear Modifications for Reducing Interactions 1.3 Oceanographic Environment ......................3 of Sea Turtles with Longline Fishing Gear in 2. PROGRAM OVERVIEW ......................................4 Costa Rica ...................................................15 3. SELECT BIOLOGY PROJECTS ..............................6 8.3 A General Bayesian Integrated Population 3.1 Reproductive Biology of Yellowfin Tuna, Dynamics Model for Protected Species ...........16 Thunnus albacares ..........................................6 9. SELECT TROPHODYNAMICS PROJECTS .............16 3.2 Vertical Habitat of Bigeye and Albacore 9.1 Integrating Conventional and Electronic Tunas and Post-Release Survival for Marlins Tagging Data into the Spatial Ecosystem and in the Central Pacific Longline Fisheries............7 Population Model SEAPODYM........................16 3.3 Age and Growth of Striped Marlin, Kajikia 9.2 Impacts of Mesoscale Oceanographic audax, in the Hawai‘i-Based Longline Fishery ...7 Features on the Forage Base for Oceanic 4. SELECT STATISTICAL AND MODELING PROJECTS ..8 Predators.....................................................16 4.1 Incorporating Oceanographic Data in Stock 9.3 Intra-Guild Predation and Cannibalism Assessments of Blue Sharks and Other Species in Pelagic Predators: Implications for the Incidentally Caught in the Hawai‘i-Based Dynamics, Assessment and Management of Longline Fishery .............................................8 Pacific Tuna Populations ...............................17 4.2 Analyses of Catch Data for Blue 10. SELECT GENETICS PROJECTS ...........................18 and Striped Marlins (Istiophoridae) ..................9 10.1 Analysis of Pacific Blue Marlin and 4.3 Pacific-wide Analyses of Bigeye Tuna Swordfish Population Structure using (Thunnus obesus) Using MULTIFAN-CL ...............9 Mitochondrial and Nuclear DNA Technologies .. 18 5. SELECT ECONOMIC PROJECTS .........................10 10.2 Population Structure and Dynamics in 5.1 Role of Social Networks on Mahimahi as Inferred through Analysis of Fishermen Economic Performance in Mitochondrial DNA. ......................................18 Hawai‘i’s Longline Fishery .............................10 10.3 An Assessment of Bigeye Tuna 5.2 Factors Affecting Price Determination and (Thunnus obesus) Population Structure in the Market Competition for Fresh Pelagic Fish ......10 Pacific Ocean based on Mitochondrial DNA 5.3 Incidental Catch of Non-target Fish and Microsatellite Variation. .........................19 Species and Sea Turtles ................................10 11. CONCLUSION ...............................................19 6. SELECT SOCIOCULTURAL PROJECTS .................11 APPENDIX 1: Tuna Inclusion in the 6.1 Local Fishery Knowledge .........................11 Magnuson-Stevens Act .......................................20 6.2 Sociological Baseline of Hawai‘i-Based APPENDIX 2: Targeted and Non-targeted Longline Fishery ...........................................11 Pelagic Species in the Western Pacific Region ......22 6.3 Archaeological and Historical Data on APPENDIX 3: PFRP Projects and Fisheries for Pelagic Species in Guam and Principal Investigators .......................................27 Northern Mariana Islands .............................11 APPENDIX 4: PFRP Convened, Co-Convened and 7. SELECT OCEANOGRAPHY PROJECTS .................13 Supported Meetings ..........................................30 7.1 Oceanographic Characterization of the APPENDIX 5: PFRP Newsletter Issues American Samoa Longline Fishing Grounds and Articles ......................................................31 for Albacore (Thunnus alalunga) .................... 13 REFERENCES ......................................................34 7.2 Regime Shifts in the Western and Central Pacific Ocean Tuna Fisheries. ............. 13 i List of Illustrations List of Acronyms Fig. 1. Western and Central Pacific Ocean AMO Atlantic multi-decadal oscillation and Eastern Pacific Ocean .......................................1 BPUE bycatch per unit effort Fig. 2a. Eastern Pacific tuna catches 1960-2018 ....................1 CLIOTOP Climate Impacts on Oceanic Top Predators cm centimeter Fig. 2b. Western & Central Pacific tuna catches 1960-2018 ....1 CNMI Commonwealth of the Northern Mariana Islands Fig. 3. Extent of Polynesia, Melanesia and Micronesia ........2 CPUE catch per unit effort Fig. 4. U.S. EEZ in Oceania ................................................3 EEZ exclusive economic zone Fig. 5. PFRP Steering Committee .......................................4 ENSO El Niño–Southern Oscillation EPO Eastern Pacific Ocean Fig. 6. Releasing a bigeye tuna carrying an electronic FAD Fish aggregating device data-logging and tracking tag .................................5 FCMA Fishery Conservation and Management Act Fig. 7. Ripe ova of a reproductively active yellowfin tuna ....6 FEP Fishery Ecosystem Plan Fig. 8. Female yellowfin in Hawai‘i with mature gonads .....6 FFA Forum Fisheries Agency FL fork length Fig. 9. Beach landing of mature yellowfin tuna ..................6 GLM generalized linear models Fig. 10. A purse-seine vessel advancing on a large school HTTP Hawai‘i Tuna Tagging Project of tuna actively feeding on the ocean anchovy .........6 IATTC Inter-American Tropical Tuna Commission Fig. 11. NOAA researcher attaching pop-up archival tag ISC International Scientific Committee for Tuna on an albacore tuna ...............................................7 and Tuna-Like Species Fig. 12. Bigeye tuna high-resolution archival data ................7 JIMAR Joint Institute for Marine and Atmospheric Research Fig. 13. Pacific striped marlin distribution and study regions . 8 kg kilogram Fig. 14. Growth rates of Pacific striped marlin ......................8 km kilometer Fig. 15. Median values of blue shark stock size ....................8 LJFL lower jaw fork length Fig. 16. Spatial comparison of bigeye standardized CPUE ......9 m meter MHLC Multilateral High-Level Conference Fig. 17. Network configuration of all relations identified mm millimeter by Hawai‘i’s longline fishermen. ........................... 10 MLE maximum likelihood estimation Fig. 18. Guam archaeological sites .................................... 12 MSA Magnuson-Stevens Fishery Conservation Fig. 19. Fishhooks from archaeological sites in Guam ......... 12 and Management Act MSY maximum sustainable yield Fig. 20. Human bone point of composite fishhook from mt metric ton Ylig Bay, Guam .................................................... 12 mtDNA mitochondrial DNA Fig. 21. Representative monthly sea surface Chl a nm nautical mile concentrations over the Southwestern Pacific ........ 13 NMFS National Marine Fisheries Service Fig. 22. Yellowfin tuna recruitment estimates ....................14 PI principal investigator Fig. 23. Olive ridley sea turtle entanglement ..................... 15 PICES North Pacific Marine Science Organization PIFSC Pacific Islands Fisheries Science Center Fig. 24. Representative mesopelagic micronekton. ............. 17 PFRP Pelagic Fisheries Research Program Fig. 25. Mean percent frequency of occurrence of PRIAs Pacific Remote Islands Areas skipjack tuna and yellowfin tuna in the diets PSAT Pop-up Satellite Archival Tag of apex predators ................................................ 18 RFP request for proposal Fig. 26. Releasing a striped marlin with a popup SCTB Standing Committee on Tuna and Billfish satellite tag......................................................... 25 SEAPODYM Spatial Ecosystem and Population Dynamics Model Fig. 27. Swapping out an acoustic receiver mounted SEC South Equatorial Current below a fish aggregation device ............................ 29 SECC South