NMFS Report SWFSC Activities Highly Migratory Species Gerard - - PowerPoint PPT Presentation

Southwest Fisheries Science Center

NMFS Report SWFSC Activities Highly Migratory Species

Gerard DiNardo

Director, Fisheries Resources Division

Agenda Item J.1.b Supplemental SWFSC Presentation 1 March 2019

Presentation Outline

• Highly Migratory Species (HMS)

Biological Research

• HMS Management Tools
• HMS Stock Assessment Schedule
• HMS Meetings/Workshops

PBF Biological Sampling

• 2018: Fish collected from 14 - 364 lbs
• No sign of spawning or gonadal development in larger fish

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

PBF Foraging Ecology (2008-2018)

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

Important Prey Species by Year

Northern Anchovy Fish Jack Makerel Myctophidae Pacific Mackerel Pacific Saury Sebastes spp Sardine Cephalopods Crustaceans Pelagic Red Crab

PBF Recreational Catch Size Sampling

• 4024 bluefin measured from long- and short-range CPFV trips (2013-2018)
• 2018 larger fish continued to be caught (up to 364 lbs) (n= 379)

2 4 6 8 10 12 14 16

59 63 66 69 73 79 82 85 88 91 94 97 100 103 106 109 112 118 121 125 128 132 135 152 155 159 162 165 168 171 174 177 183 193

Frequency

Fork length (cm)

2018

6

10 20 30 40 50 60 70 80 90 100 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

Frequency Fork length (cm)

2014 2015 2016 2017 2018 age 1 age 2 age 3 age 4 age 5

age 7

age 6 age 1 age 2 age 3 age 4 age 5 age 10 1,732 samples; 74 trips; July-Sep. 492 samples from 32 trips; June- Sep. range 56.0-165.1 cm FL; average 87.44 cm; age class 1-6 *Mexican PBF closure in place for all 2015 and U.S. bag limit reduced from 10 to 2 fish/day 775 samples from 68 trips; April- Sep. range 60.5 -184.3 cm FL; average 102.9 cm; age class 1-7 349 samples from 47 trips; May-December range 46.1 -210.2 cm FL; average 106.8 cm age class 1-10

Bluefin Recreational Catch Size Sampling

379 samples

Goal: Quantify dynamics of Bluefin movements across the Pacific using otolith and tissue microchemistry

Progress to date

• 1. Established collaboration with Japan
• 2. Identified signature for foraging in the eastern Pacific
• 3. Identified distinct signature for two spawning grounds

Next Steps

• 1. Using transect across
• tolith determine relative

contribution of eastern fish to spawning stock biomass

• 2. Determine patterns in

recruitment to eastern Pacific

PBF SWFSC-NRIFSF Joint Bluefih Tuna Research Chemical Tracers (Otoliths and Tissue)

Spawning Juveniles Adults Migration Juveniles Adults

Natal core Transect

85% 75% 75% 90% 95%

Natal core

PBF SWFSC-NRIFSF Joint Research Chemical Tracers (Otoliths and Tissue)

Results demonstrate the ability to determine natal spawning ground and the importance

• f year class matching. Assignment should

be improved with higher sample sizes. Working being done in collaboration with Texas A&M.

August 2004 August 2012 August 2015

Observed fish/vessel day (log) Tagged fish location

1.0 3.0 2.0

Predicted fish/vessel da (log)

35 45 40 30

• 125
• 135
• 130
• 120
• 115
• 125
• 135
• 130
• 120
• 115
• 125
• 135
• 130
• 120
• 115

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)

For more on ROMS: Moore et al. 2013, Neveu et al. 2016

10

500 1000 1500 2000 2500 3000 2 4 6 8 10 12 14

Gonad wt (gm) Month

Gonad wt vs Month

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

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