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Home , Isurus, Thresher shark

Sharks in the Sanctuary

Greg Skomal, PhD Massachusetts Research Program Massachusetts Division of Marine Fisheries Massachusetts Division of Marine Fisheries Shark Research Program

• Management • Research • Life History • Ecology • Physiology • Collaboration • Education Massachusetts Shark Tournaments Composition (n = 24,840) 1987-2010

Mako Shark ( oxyrinchus) Common 5% (Alopias vulpinus) 1.2%

Blue Shark (Prionace glauca) (Carcharhinus plumbeus) 93% 0.07%

Tiger Shark (Galeocerdo cuvier) 0.01% (Carcharhinus obscurus) 0.02% Prionace glauca

Skomal and Natanson, 2003 Blue Shark: Movements Conventional Tagging

Kohler et al., 1998 Blue Shark: Movements Satellite Tagging

Braun et al., In Press Shortfin Mako Isurus oxyrinchus Shortfin Mako

IGFA World Record 1221 lbs. nasus Porbeagle Lamna nasus Porbeagle Lamna nasus

Skomal et al., 2008 Porbeagle Lamna nasus

67819 0 25

200 20

400 15

600 10 Depth (m) 800

5 (°C) Temperature

1000 0 21-Nov 5-Dec 19-Dec 2-Jan 16-Jan 30-Jan 13-Feb 27-Feb 13-Mar Alopias vulpinus Common Thresher Alopias vulpinus Cetorhinus maximus Basking Shark: Movements 52554 0 25 100 Basking Shark 200 20 300 400 15 500 600 10 Depth (m) 700 Temperature (°C) 800 5 900 1000 0 30-Sep 30-Oct 29-Nov 29-Dec 28-Jan Date Depth Range Min. °C Ma x. °C

52559 0 30 100 200 25 300 20 400 500 15

Depth (m) 600 10 700 Temperature (°C) 800 5 900 1000 0 24-Sep 24-Oct 23-Nov 23-Dec 22-Jan Date Depth Range Min. °C Ma x. °C

52562 0 35 100 30 200 300 25 400 20 500 600 15 Depth (m) 700

10 Temperature (°C) 800 5 900 1000 0 10-Oct 9-Nov 9-Dec 8-Jan 7-Feb 9-Mar 8-Apr 8-May Skomal et al., 2009 Date Depth Range Min. °C Ma x. °C White Shark

Global “Hotspots” California, South Africa, South Australia, Mexico Gray Seal Halichoerus grypus

Wayne Davis Wayne Davis Tagging to Date 2009 – 2019 (203 ) 2.4 – 5.5 m (4-17 ft) 182 Acoustic (V16, Vemco)

55 Pop-up Satellite (PAT, Wildlife Computers)

8 Real-time Satellite (SPOT, Wildlife Computers) Acoustic Detections Acoustic Detections 2012-2018 Cape Cod Movements: Satellite-based Tag 28-day Pop-up Satellite Tag

Acceleration Data Loggers Broad-scale Movements Broad-Scale Movements PSAT/SPOT (n=28)

Questions? 2004 A white shark? Really? Where?

Tagging

Wayne Davis Coastal Wayne Davis Sand Sharks = Dogfish Squalus acanthias

Smooth Dogfish Mustelus canis Sandbar Shark Carcharhinus plumbeus Sand tiger Carcharias taurus Sand tiger Plymouth, Kingston, Duxbury Bay – 2009-2012

Cape Cod Bay

Duxbury Bay

Kingston Bay

Plymouth Bay

Plymouth Harbor

Warren Cove Galeocerdo cuvier Offshore Inshore/Offshore