Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Cawthron’s current fouling research in the Marlborough sounds

13c1e126e91944499df10d649c4aeec9?s=47 jatalah
May 13, 2013

Cawthron’s current fouling research in the Marlborough sounds

Marine Farming Association Blue Mussel Over-settlement Project and Spat Committee Meeting / Workshop

13c1e126e91944499df10d649c4aeec9?s=128

jatalah

May 13, 2013
Tweet

Transcript

  1. CAWTHRON’S CURRENT FOULING RESEARCH IN THE MARLBOROUGH SOUNDS JAVIER ATALAH

    Spat Committee Meeting / Workshop MFA, Havelock, 10 of May 2013
  2. CAWTHRON TEAM…. Biosecurity team leader: Grant Hopkins Senior scientist and

    consultant: Barrie Forrest Molecular tools: Xavier Pochon Novel mitigation tools, fouling ecology : Javier Atalah Pelorus fouling patterns : Ashleigh Watts (MSc) Fouling patterns : Mauricio Cifuentes (PhD) Didemnum ecology & impacts: Lauren Fletcher Epidemiology and risk management : Aurelie Castinel
  3. BIOFOULING AND AQUACULTURE • Significant threat to a number of

    aquaculture industries worldwide • Often strong competitors (eg space and food) • Solitary ascidians impacting cultured mussel and oyster industries overseas • Increased costs of production and processing • Impacts on growth rates and meat yields
  4. Mytilus spp.

  5. Didemnum vexillum

  6. Ciona intestinalis

  7. Cladophora spp.

  8. FOULING AND THE MUSSEL INDUSTRY • Can overgrow and smother

    mussels on lines • Increased weight can lead to crop losses • Concern around effects on seed-stock survival • Lack of basic ecological information (eg seasonality, reproduction, distribution, etc.) • Limited impact studies
  9. FOULING COMMUNITIES ALONG THE PELORUS SOUND  Mauricio Cifuentes (PhD

    work) - University of Wellington Objectives  To describe fouling communities along the Pelorus Sound in relation to environmental variables.  Evaluate the influence seasonality, age and substrate position on the development and composition of biofouling.  Define regions with distinct biofouling.
  10. STUDY SITES

  11. EXPERIMENTAL UNITS

  12. SURFACE TEMPERATURE

  13. SURFACE SALINITY PATTERNS

  14. SEDIMENTATION RATES

  15. FOULING BIOMASS

  16. SOLITARY ASCIDIANS

  17. BROWN SEAWEED

  18. COLONIAL ASCIDIANS

  19. BLUE MUSSELS

  20. BARNACLES

  21. BRYOZOANS

  22. FUTURE WORK • Within bay fouling variability • Predictive models

    • Incorporate other environmental variables (eg rainfall, currents, exposure level, turbidity, etc) • Additional seasons, year and fouling community ages (3, 6 and 12 month old).
  23. BLUE OVER-SETTLEMENT PROJECT  Sorting of 1974 – 2012 data

    provided by J. Jenkins  Preliminary analyses  Pending shellfish programme proposal for further analyses
  24. Mytilus Perna Observed historical spat recruitment

  25. PREDICTED ANNUAL PATTERNS OF RECRUITMENT Mytilus Perna

  26. PREDICTED SPAT RECRUITMENT VS. TEMPERATURE Mytilus Perna

  27. BLUE SPAT RECRUITMENT BY DEPTH

  28. GREEN SPAT RECRUITMENT BY DEPTH

  29. MYTILUS RECRUITMENT BY SITE

  30. PERNA RECRUITMENT BY SITE

  31. OTHER RELATED RESEARCH: MOON JELLYFISH

  32. NATIVE OR ALIEN?

  33. None