The Third International Stock Enhancement & Searanching


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Keynote Speakers

Kai LorenzenUnderstanding and managing fisheries enhancement systems, Kai Lorenzen

Yonathan ZoharThe Chesapeake Bay Blue Crab (Callinectes sapidus): a Multidisciplinary Approach to Responsible Stock Enhancement,
Dr. Yonathan Zohar

International Scientific
Committee Members



Johann Bell (Chair) The WorldFish Center
Ann-Lisbeth Agnalt Norway, Marine Research Institute
Devin Bartley FAO
Barry Berejikian USA, NOAA NW Fisheries Science Center
Lee Blankenship USA, NW Marine Technologies, Washington
Peter Britz South Africa, Rhodes University
Jiaxin Chen China, Yellow Sea Research Institute
Dave Eggleston USA, North Carolina State University
Caroline Garaway UK, University College London
Caleb Gardner Australia, University of Tasmania
Masahide Kaeriyama Japan, Hokkaido University
Shuichi Kitada Japan, Tokyo Uni. Mar. Sc. & Technology
Ken Leber USA, Mote Marine Laboratory
PingSun Leung USA, University of Hawaii
Neil Loneragan Australia, Murdoch University
Kai Lorenzen UK, Imperial College
Alessandro Lovatelli FAO
Rejii Masuda Japan, Kyoto University Fish. Res. St.
Lars Mobrand USA, Mobrand Biometrics, Washington
Erlend Moksness Norway, Marine Research Institute
Jurgene Primavera Philippines, SEAFDEC
Paulo Prodohl UK, University of Belfast
Josianne Stottrup Denmark, Institute for Fisheries Research
Terje Svasand Norway, Marine Research Institute
Mike Tringali USA, Florida Fish & Wildlife Commission

Restocking and stock enhancement systems and their role in fisheries management

  • Systems for restocking (restoring spawning biomass)
  • Systems for stock enhancement (overcoming recruitment limitation)
  • Integrated biological and socio-economic approaches
  • Case studies

When can hatchery releases add value to other forms of management?

  • Identifying self-replenishing populations - stock delineation
  • Dynamics/density dependence of target populations
  • Predictive modeling of release effects on population size
  • Decision support tools
  • Cost:benefit of different approaches to restocking and stock enhancement
  • Integrating hatchery releases with other forms of management
  • Management of released juveniles

looking up

Institutional and socio-economic issues

  • Developing appropriate incentives for restocking and stock enhancement
  • Legal frameworks for investment and resource use
  • Access to released and wild stocks
  • Co-management
  • Institutional arrangements
  • Lessons from enhanced marine and freshwater fisheries

Release strategies

  • Methods for reducing predation
  • Habitat requirements
  • Optimal release size
  • Stocking density
  • Release times
  • Overcoming Allee effects

Interactions between wild and released stocks

  • Genetic considerations
  • Disease risk assessments
  • Resilience of enhanced populations and other species in the ecosystem
  • Mechanisms to minimize negative interactions
  • Cost:benefit of culling predators
  • Carrying capacity

fish blur

Biological insights from hatchery releases

  • Improved knowledge of habitat requirements
  • Connectivity in habitat use among different life history stages
  • Identifying bottlenecks to survival of juveniles in the wild
  • Case studies of benefits to fisheries science and management

Arenas of progress

  • Geographical areas
  • Technology (hatchery, 'environmental enrichment', tagging, releases)
  • Responsible practice
  • Species/situations best suited to restocking and stock enhancement

Synthesis and discussion

  • Lessons learned
  • Conclusions
  • Research agenda