putting ship strikes and entanglements in perspective€¦ · blue whale mortality =18 humpback =22...
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Putting Ship Strikes and Entanglements in PerspectiveCotton RockwoodSenior Marine Ecologist
November 28, 2018
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More than 80 whales struck by ships Estimated annual mortality is 8x (blue), 2x (humpback) greater than the U.S. federal guidelines
BlueWhale
Mortality=18
HumpbackWhale
Mortality=22
FinWhale
Mortality=43
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Most mortality from nearshore traffic
74% 82% 65%
Blue Whale Humpback Whale Fin Whale
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Proven Solutions
• Speed restrictions
• Traffic routing to avoid whale hotspots
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Strikes vs Entanglements
SpeciesShip Strike Mortality
(per year)Entanglement Mortality
(per year)
Humpback whales 22 14.1
Blue whales 18 0.9
Fin whales 43 0.5
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Crab pot gear in warm and cold years
Warm/poor years
(2010, 2013)
Cold/good years
(2008, 2009 & 2011)
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Entanglement risk for humpback whales
Warm/poor years
(2010, 2013)
Cold/good years
(2008, 2009 & 2011)
Observed
Predicted
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For more information contact:
Cotton Rockwood
or
Jaime Jahncke, PhD