Understanding Dungeness crab fishing dynamics and rising whale entanglements Jameal Samhouri and Blake Feist NOAA Northwest Fisheries Science Center How have California Dungeness crab fishery landings and activity changed over time and across the coast? Office of National Marine Sanctuaries National Oceanic and Atmospheric Administration West Coast Region Ocean Acidification Case Study: Dungeness Crab Data sources How will Ocean Acidification What is Ocean Acidification? Affect Dungeness Crab? Today, rampant burning of fossil fuels, including coal, oil, and Dungeness crab are an abundant and 1. PacFINnatural fish gas, ticketsis releasing tooand much vessel valuable lengths species throughout national carbon dioxide into the atmosphere. marine sanctuaries along the West 2. Vessel Monitoring System (VMS)Coast of thedata United States. NOAA research shows that crabs in their early larval stages are vulnerable to low pH Years: 2009-2016 seawater. Spatial extent: US continental westLife Cycle coast of the Dungeness Crab Molting from one stage to the next and carrying fertilized eggs require a lot of energy, as does dealing with stress from global ocean change. Most Matched fish tickets to VMS locations within a specified time periodvulnerable • Depth stages • Vessel speed • Specified “look back” window Annually, about 25% of human- caused carbon dioxide emissions is absorbed by the ocean, making the ocean’s chemistry more acidic. NOAA Research Shows Crabs are Vulnerable In lab studies, exposure to lower pH seawater decreases Dungeness crab larval development rates and survival. It also impacts the prey species—such This decrease in ocean pH over as bivalves—which they depend time is called ocean acidification on. Complex modeling projects and it makes it harder for a 41% decline in Dungeness calcifying animals like Dungeness crab biomass and 30% loss in crab to thrive. economic revenue in the next 50 years due to ocean acidfication. http://sanctuaries.noaa.gov/education/oa Representation of the California Dungeness crab Office of National Marine Sanctuaries fishery in the VMS databaseNational Oceanic and Atmospheric Administration West Coast Region Office of National Marine Sanctuaries Ocean Acidification Case Study:National DungenessOceanic and Atmospheric Crab Administration West Coast Region How will Ocean Acidification What is Ocean Acidification? 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