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Pacific Bluefin Tuna Biological Sampling

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Pacific Bluefin Tuna Biological Sampling Agenda Item J.1.b Supplemental SWFSC Presentation 1 March 2019 NMFS Report SWFSC Activities Highly Migratory Species Gerard DiNardo Southwest Fisheries Science Center Director, Fisheries Resources Division Presentation Outline • Highly Migratory Species (HMS) Biological Research • HMS Management Tools • HMS Stock Assessment Schedule • HMS Meetings/Workshops PBF Biological Sampling Year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Total Number 75 78 54 189 294 171 156 120 276 421 493 2327 • 2018: Fish collected from 14 - 364 lbs • No sign of spawning or gonadal development in larger fish PBF Foraging Ecology (2008-2018) Important Prey Species by Year 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Northern Anchovy Fish Jack Makerel Myctophidae Pacific Mackerel Pacific Saury Sebastes spp Sardine Cephalopods Crustaceans Pelagic Red Crab 2018 Frequency 10 12 14 16 0 2 4 6 8 59 63 • • PBF 66 2018 fishtolarger continued be caught(up 4024 69 Recreational Catch Size Sampling 73 bluefin 79 82 85 from long measured 88 91 94 97 100 103 - Fork length (cm) 106 short and 109 112 118 to364 - 121 rangeCPFV 125 128 lbs 132 ) (n= 379) 135 trips (2013 152 155 159 - 162 2018) 165 168 171 174 177 183 193 Bluefin Recreational Catch Size Sampling 2014 1,732 samples; 74 trips; July-Sep. 100 age 2 90 492 samples from 32 trips; June- Sep. 2015 range 56.0-165.1 cm FL; average 87.44 cm; age class 1-6 80 *Mexican PBF closure in place for all 2015 and U.S. bag age 1 limit reduced from 10 to 2 fish/day 70 2016 775 samples from 68 trips; April- Sep. 60 range 60.5 -184.3 cm FL; average 102.9 cm; age class 1-7 349 samples from 47 trips; May-December 50 age 3 2017 range 46.1 -210.2 cm FL; average 106.8 cm Frequency 40 age class 1-10 30 2018 379 samples age 4 age 5 20 age 6 age 7 10 age 10 0 46 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99 101 103 105 107 109 111 113 115 117 119 121 123 125 127 129 131 133 135 137 139 141 143 145 147 149 151 153 155 157 159 161 163 165 167 169 171 173 175 177 180 183 192 210 Fork length (cm) 6 PBF SWFSC-NRIFSF Joint Bluefih Tuna Research Chemical Tracers (Otoliths and Tissue) Goal: Quantify dynamics of Bluefin movements across the Pacific using otolith and tissue microchemistry Progress to date 1. Established collaboration with Japan Transect Natal core 2. Identified signature for foraging in the eastern Pacific 3. Identified distinct signature for two spawning grounds Next Steps 1. Using transect across otolith determine relative contribution of eastern fish Juveniles to spawning stock biomass 2. Determine patterns in Adults recruitment to eastern Spawning Juveniles Pacific Adults Migration PBF SWFSC-NRIFSF Joint Research Chemical Tracers (Otoliths and Tissue) 85% 75% Results demonstrate the ability to determine natal spawning ground and the importance of year class matching. Assignment should be improved with higher sample sizes. Working being done in collaboration with 75% 90% Texas A&M. Natal core 95% Albacore Distribution Modeling • Boosted regression trees built using surface fishery logbook data, and environmental data from ROMS/satellites • Example results from August show interannual variability in southward habitat extent for albacore • Distribution models also built for major prey species (anchovy, sardine, hake, boreal clubhook squid) August 2004 August 2012 August 2015 45 Observed Predicted fish/vessel day fish/vessel da (log) (log) 1.0 2.0 40 3.0 Tagged fish location 35 30 -135 -130 -125 -120 -115 -135 -130 -125 -120 -115 -135 -130 -125 -120 -115 For more on ROMS: Moore et al. 2013, Neveu et al. 2016 Opah: Biological Sample Program with COP Goal: Characterize life history parameters Progress to date: 1) Collected 167 biological samples/ 791 genetic samples 2) Identified actively spawning individuals Next Steps: 1) Better characterize reproductive biology 2) Develop methods for age and growth 3) Determine species distribution 4) Characterize foraging ecology Gonad wt vs Month 3000 2500 2000 1500 Gonad wt (gm) wt Gonad 1000 500 0 0 2 4 6 8 10 12 14 Month 10 HMS Management Tools North Pacific Albacore Tuna • MSE Webinar (preparatory discussion) – Feb. 13, 2019 (Agenda Item J.2, Suppl. Att. 4) • MSE Workshop – March 5-7, 2019 (Final Report Forthcoming) • NO MAJOR MANAGEMENT DECISIONS (MSE MESSAGE STILL CONFUSING) • refinement of management objectives and levels of risk • discussed pros & cons of managing based on catch or effort (TAC or TAE) • exploring different harvest strategies (or HCR) Next Round of MSE Testing Completed in 2020 HMS Management Tools Pacific Bluefin Tuna • WCPFC-NC 2017 – ISC Requested to Conduct MSE Starting in 2019 • 1st MSE Workshop – May 2018 Yokohama JPN • 2nd MSE Workshop – May 20-21, 2019 (Tom Ham’s Lighthouse, San Diego, CA) • U.S. PBF Stakeholders Meeting (WCRO/SWFSC) – May 2, 2019 (SWFSC & Long Beach Fed. Building) • WCPFC-NC 2019 – Final Decision HMS Stock Assessment Schedule 2019 • North Pacific Striped Marlin (B) 2020 • North Pacific Albacore Tuna (B) • Pacific Bluefin Tuna (B) • Pacific Blue Marlin (U) HMS Meeting/Workshop Schedule 2019 • ISC PBF Close-Kin Workshop – March 16-17, 2019 Jeju, Korea • ISC PBFWG Workshop – March 18-22, 2019 Jeju, Korea • U.S. PBF Stakeholders Meeting – May 2, 2019 (SWFSC & Long Beach Fed. Building) • ISC19 July 9-15, 2019 Taipei, Taiwan • HMS Fishery Dependent Monitoring Workshop – SWFSC TBD • HMS Research Coordination Workshop (NP Albacore & PBF tuna focus) – SWFSC TBD 2020 • ISC20 – U.S. Thank You Questions? Thank You.
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