greg stunz, ph.d. endowed chair for fisheries and ocean health, … · 2016-07-23 · will mcglaun...
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Minimizing discard mortality in the red snapper fishery in the Gulf of Mexico
Minimizing discard mortality in the red Minimizing discard mortality in the red snapper fishery in the Gulf of Mexicosnapper fishery in the Gulf of Mexico
Greg Stunz, Ph.D.Greg Stunz, Ph.D.Endowed Chair for Fisheries and Ocean Health, andEndowed Chair for Fisheries and Ocean Health, and
Professor of Marine BiologyProfessor of Marine BiologyTexas A&M UniversityTexas A&M University--Corpus ChristiCorpus Christi
The SportThe Sport--fish Research Group at HRIfish Research Group at HRI
Goal: Provide sound science for maintenance and Goal: Provide sound science for maintenance and rebuilding of sportrebuilding of sport--fisheries for future generationsfisheries for future generations
““iSnapperiSnapper””An innovative tool for An innovative tool for collecting data in the collecting data in the
ForFor--Hire Fishery Hire Fishery (aka charters)(aka charters)
Red Snapper Recreational CatchRed Snapper Recreational CatchSource: iSnapper Pilot Data, Summer 2011Source: iSnapper Pilot Data, Summer 2011
Red Snapper Recreational CatchRed Snapper Recreational CatchSource: iSnapper Pilot Data, Summer 2011Source: iSnapper Pilot Data, Summer 2011
Reduced foragingability
Lingering Barotrauma
Depredation
The The ““Discarded AliveDiscarded Alive”” SliceSlice
hitech‐dolphin.com
Photo credit: ChrisPederick.com
Acoustic Deterrent Devices (ADD):Acoustic Deterrent Devices (ADD):.
AQUAmark 200 Cetacean AQUAmark 200 Cetacean Deterrent DeviceDeterrent Device
Photo credit: ChrisPederick.com
Pilot StudyPilot Study
ADDADD in Actionin Action
Experimental Design
Photo credit: ChrisPederick.com
Future?Future?
Recent Barotrauma StudiesRecent Barotrauma Studies.
•• Vent vs nonVent vs non--ventvent•• Depth effectsDepth effects•• Rapid recompressionRapid recompression
Controlled Laboratory ConditionsControlled Laboratory ConditionsField ConditionsField Conditions
VentedVented NonNon‐‐VentedVented
Results:Results:
Release Treatments:Release Treatments:
n=30
n=30
Design:Design:
Methods:Methods:
Seasonal Field Survival
Methods:Methods:
SummarySummary
•• ADD, venting, and recompression all show promiseADD, venting, and recompression all show promise
•• A clear seasonal effect on mortalityA clear seasonal effect on mortality
•• We would recommend venting, especially during summerWe would recommend venting, especially during summer
•• More work to be doneMore work to be done
• Better characterize this “problem” in the Gulf of Mexico?
• What are the root causes of depredation events?
• How useful are ADDs as a technique to mitigate depredation by dolphins and increase discard survival?
• Fin recognition program, are the problem pods of dolphins?
• Is there a “dinner bell” effect?
• Work with marine mammalogists that can better understand behavioral responses.
Future ADD StudiesFuture ADD Studies
AcknowledgementsAcknowledgements
Research Scientists, PostResearch Scientists, Post--Docs, Graduate Students, and Student Workers:Docs, Graduate Students, and Student Workers:
Megan RobillardMegan Robillard Jason WilliamsJason Williams Jennifer WetzJennifer Wetz
Matt AjemianMatt Ajemian Judd Curtis Judd Curtis Matt JohnsonMatt Johnson
Peter Young Peter Young Phil JosePhil Jose Alison LundAlison Lund
Will McGlaunWill McGlaun Ruben PalaciosRuben Palacios Maurico ManceraMaurico Mancera
NOAA Fisheries NOAA Fisheries –– Marine Fisheries InitiativeMarine Fisheries Initiative
NOAA NOAA –– Cooperative Research ProgramCooperative Research Program
Harte Research Institute for Gulf of Mexico StudiesHarte Research Institute for Gulf of Mexico Studies
Texas A&M University Texas A&M University –– Corpus ChristiCorpus Christi
www.fisheries.tamucc.eduwww.fisheries.tamucc.edu www.harteresearchinstitute.orgwww.harteresearchinstitute.org
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