Out of Sight, Not out of Mind: Estimating and Reducing Release Mortality in Commercial and Recreational Fisheries, Part 1

Monday, August 18, 2014: 1:30 PM-5:20 PM
301A (Centre des congrŤs de Quťbec // Quťbec City Convention Centre)
The management of many recreational and commercial fisheries faces continued challenges due to overfishing, bycatch, and slow stock rebuilding processes.  The NOAA Fisheries 2012 Status of Stocks report identified several important recreational and commercial fish stocks as overfished.  These identified stocks are characterized by high levels of both discards and concomitant high levels of release mortality.  The term “release mortality” refers to the rate of mortality of a fish after it has been discarded.  This rate is thought to be a function of many factors including: handling, air exposure, thermal stress, and injuries resulting from the capture process.  Release mortality can be immediate, due to severe injury or post-release predation, or it can be longer-term.  For example, as a result of starvation if a fish’s internal organs have been damaged by fishing.  “Barotrauma” can also contribute to release mortality. This results from a change in pressure as deep-water physoclistous fish species are rapidly brought to the surface. Given the potential magnitude of bycatch mortality across many species and fisheries, scientists, managers and fishermen, have worked collaboratively to evaluate and quantify this source of mortality.   Ultimately, research results help develop and promulgate best management practices designed to reduce post-release mortality, reduce overall fishing mortality, and lead to increased fishing opportunities. 

This symposium will present efforts of U.S. and Canadian researchers to understand the process of release mortality in recreational and commercial fisheries that ultimately result in the use of effective fishing and fish-handling practices.  This symposium also will describe efforts to incorporate improved release mortality rate estimates in the stock assessment process.  By presenting current, cutting-edge research on release mortality, which supports management in both local and international contexts, this symposium supports the 2014 AFS theme of moving from fisheries research to management and thinking and acting locally and globally.

Moderators:
NoŽlle Yochum , David Rudders and Mark Chandler
Chairs:
NoŽlle Yochum and David Rudders
Organizers:
NoŽlle Yochum , David Rudders , Lee Benaka and Derek Orner
Moderators:
NoŽlle Yochum
Email: Noelle.Yochum@oregonstate.edu

David Rudders
Email: rudders@vims.edu

Mark Chandler
Email: Mark.Chandler@noaa.gov

Chairs:
NoŽlle Yochum
Email: Noelle.Yochum@oregonstate.edu

David Rudders
Email: rudders@vims.edu

Organizers:
NoŽlle Yochum
Email: Noelle.Yochum@oregonstate.edu

David Rudders
Email: rudders@vims.edu

Lee Benaka
Email: Lee.Benaka@noaa.gov

Derek Orner
Email: Derek.Orner@noaa.gov

1:30 PM
Fisheries Discard Mortality: Data Gaps and Solutions
Lee Benaka, National Marine Fisheries Service; NoŽlle Yochum, Oregon State University; Derek Orner, NOAA-NMFS

2:10 PM
Implications of Discard Mortality on Catch Retention Scenarios
Catherine E. O'Keefe, University of Massachusetts; Steven X. Cadrin, University of Massachusetts; Adam S. Barkley, University of Massachusetts

2:30 PM
Release Mortality of Pacific Halibut from Commercial and Recreational Fisheries - a 50 Year Perspective
Stephen Kaimmer, International Pacific Halibut Commission; Gregg Williams, International Pacific Halibut Commission

2:50 PM
The Survival of Rajids Discarded in the New England Scallop Dredge Fisheries
Ryan Knotek, University of New England; David Rudders, Virginia Institute of Marine Science; John Mandelman, New England Aquarium; James Sulikowski, University of New England; Hugues Benoit, Gulf Fisheries Centre, Fisheries and Oceans Canada

3:10 PM
Monday Afternoon Break


3:40 PM
Coding Release Condition and Estimating Post-Release Mortality of Shark Bycatch in the Canadian Pelagic Longline Fishery
Jarrett Corke, WWF-Canada; Tonya Wimmer, WWF-Canada; Irene Andrushchenko, Fisheries and Oceans Canada; Erin Carruthers, Fisheries and Marine Institute of Memorial University

4:00 PM
Going Topless for Sea Turtles: Bottom Trawl Modifications to Maintain Catch Efficiency of Summer Flounder While Reducing Sea Turtle Interactions
Meghan Gahm, University of Rhode Island; Joseph DeAlteris, University of Rhode Island; Christopher Parkins, Coonamessett Farm Foundation; Henry O. Milliken, National Marine Fisheries Service; Eric Matzen, Integrated Statistics; Jim Ruhle, FV Darana R; Chris Roebuck, Captain; Mary O'Rourke, Trawlworks; Jonathan Knight, Superior Trawl

4:20 PM
Mechanisms to Explain Bycatch Mortality in Coho Salmon: Interactions Between Injury, Reflex Impairment, and Physiology
Graham D. Raby, Carleton University; Steven J. Cooke, Carleton University; Scott Hinch, University of British Columbia; David A. Patterson, Fisheries and Oceans Canada

See more of: Symposium Proposals