Our Oceans 2015, 6 October 2015, Valparaiso, Chile OCEANS AND ATMOSPHERE FLAGSHIP Transforming monitoring and assessment of international fisheries Campbell Davies, Mark Bravington, Peter Grewe and many others
Jan 18, 2016
Our Oceans 2015, 6 October 2015, Valparaiso, Chile
OCEANS AND ATMOSPHERE FLAGSHIP
Transforming monitoring and assessment of international fisheriesCampbell Davies, Mark Bravington, Peter Grewe and many others
Perennial Challenges for Sustainable Fisheries
• How many fish are being caught?• How many fish are left?• Agreeing how many can be caught in the future.
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A case for change – Southern Bluefin Tuna
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Strong evidence of Recruitment failure
Highly depleted stock
High uncertainty in:• CPUE (abundance)• Total catches
4 lowest years on record
historical low of 3-5% unfished Spawning biomass
Requires new fisheries independent approaches
How many spawning SBT are there?Close-kin Abundance
• Each fish has 2 parents• Juveniles “tag “ adults• Catch adults and juveniles• Count the no. of Parent-
Offspring-Pairs• Adult abundance is inversely
proportional to number of matches
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Juveniles
Adults
SBT• Successful six year study, international peer review• ~2.5 times higher than assessment; reduced uncertainty in stock status• Results incorporated in international stock assessment (CCSBT)• High priority for monitoring of spawning stock and success of rebuilding
What’s the catch? Tackling IUU and mis-reporting•What Species?•Which Ocean?•Is it from a managed
fishery?
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Species ID on your phone ?
Catch - More accurate, timely & transparent Modern genetics provide the tools for:• Species ID in the field• Provenance of fish populations
across the globe• Individual ID and product
tracking
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P.M. Grewe, et al, In press. Evidence of discrete yellowfin tuna (Thunnus albacares) populations demands rethink of tuna management. Nature – Science Reports
Discrete pan-Pacific yellowfin tuna populations
Western Pacific Eastern Pacific
Western Pacific
Practical application:• Truth in labeling• Accurate catch estimates• Identifying IUU catch
Practical implementation of the precautionary approachHarvest strategy• Combination of monitoring,
assessment, harvest control rule, management objectives.
• Performance against objectives tested by simulation (Management Strategy Evaluation)
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CCSBT “Bali Procedure”• Rebuild stock to 20% unfished by
2035 with probability of 70%.• Inputs: Index of recruitment + CPUE• 2 global TAC decision cycles
complete, 3rd decision scheduled for 2016
Practical Achievable Actions• Increase momentum to ratify and Implement existing international agreements
• Targeted applications of species ID and provenance tools to identify sources of IUU (and close access to markets), increase sustainable yields and consumer confidence.
• Targeted studies of Close-Kin for appropriate populations of harvested stocks and threatened species to demonstrate general efficacy and cost-effectiveness
• Wider development and testing of formal harvest strategies to improve fishery performance, conserve biodiversity and increase transparency and cost-effectiveness of management.
• Global partnerships and collaboration a central requirement
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Thank you
Dr Campbell Davies
[email protected] Oceans and Atmosphere Flagship, Hobart, Tasmania, Australiawww.csiro.au
9 Our Oceans 2015, Valparaiso, Chile | Campbell Davies