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Status of Lake Trout ( Salvelinus namaycush )

Status of Lake Trout ( Salvelinus namaycush ). in Georgian Bay and North Channel Lloyd C. Mohr Upper Great Lakes Management Unit, Lake Huron Office, OMNR Owen Sound, ON. Background. Statistical Districts in Cdn Waters. Data Sources: - Commercial Harvest

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Status of Lake Trout ( Salvelinus namaycush )

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  1. Status of Lake Trout(Salvelinus namaycush) in Georgian Bay and North Channel Lloyd C. Mohr Upper Great Lakes Management Unit, Lake Huron Office, OMNR Owen Sound, ON

  2. Background Statistical Districts in Cdn Waters Data Sources: - Commercial Harvest - Commercial Catch Sampling - Index Assessment Surveys - Recreational Surveys

  3. LakeTrout Rehabilitation 1996 Rehab Plan 7 Active Rehab Zones 2 Proposed Sanctuaries

  4. LakeTrout Rehabilitation Objectives Spawning Populations 2005 Natural Reproduction 2010 Self-Reproducing in Former Range 2020 Annual sustained yield 1.12 million kg

  5. LakeTrout Sources Remnant Stocks • Iroquois Bay • Parry Sound

  6. Lake Trout Sources Stocking • 11 sites • Average 850K G.Bay • 110K N. Channel • 1991 30% Backcross G. Bay • 1996 Pure Lake Trout

  7. Lake Trout Sources % GB03 40.4 LH03 20.1 LH04 27.4 GB10 8.8 GB09 97.6 GB08 2.4 GB10 56.5 GB11 14.5 GB08 14.2 GB09 9.5 Movement (CWT)

  8. LakeTrout Exploitation - Commercial Annual Harvest

  9. LakeTrout Exploitation - Commercial Annual Harvest

  10. LakeTrout Exploitation - Commercial Statistical Districts

  11. LakeTrout Exploitation - Commercial Incidental Catch

  12. LakeTrout Exploitation - Commercial Incidental Catch (%) GB NC MB 95.7 92.1 87.8 2.9 <0.1 3.6 0.7 6.5 6.6 0.7 1.3 2.1

  13. LakeTrout Exploitation - Commercial Incidental Catch (Seasonal)

  14. LakeTrout Exploitation - Commercial 1979 1989 > 1,000 kg 250 - 1000 100 - 250 10 - 100 < 10 1999 Incidental Catch (Spatial)

  15. LakeTrout Exploitation - Commercial > 1,000 kg 250 - 1000 100 - 250 10 - 100 < 10 1999 Incidental Catch (Spatial)

  16. LakeTrout Exploitation - Commercial Incidental Catch (mesh size)

  17. LakeTrout Exploitation - Sport SW Georgian Bay

  18. LakeTrout Biological Data

  19. LakeTrout - (Mean Size)

  20. LakeTrout - (Mean Age) Known Age Fish only

  21. LakeTrout - (Age Distributions) Georgian Bay North Channel

  22. LakeTrout - (Size at Age) Known Age Fish only

  23. LakeTrout - (Maturity Schedule) Females Georgian Bay 50% - 4.6 yr North Channel 50% - 5.3yr

  24. LakeTrout - (Maturity Schedule) SW Georgian Bay (females)

  25. LakeTrout - (Mortality) SW Georgian Bay (Age 4+)

  26. LakeTrout - (Sea Lamprey Wounds) All Data Sources

  27. LakeTrout Rehabilitation Objectives Spawning Populations 2005 Natural Reproduction 2010 Self-Reproducing in Former Range 2020 Annual sustained yield 1.12 million kg

  28. LakeTrout Rehabilitation Evaluation • Lake Trout Survival highly variable • Spawning Stock Size under investigation • Egg Deposition unknown • Natural Reproduction present 2-4 locations • Age Structure constricted • Range expansion in P. Sound • Abundance CPUE variable • Yield ???

  29. LakeTrout Management • Exploitation Review • Commercial Quota and Recreational Limits • Incidental Catch Rates • Reporting / Assessment Issues

  30. LakeTrout Management • Lake Trout Rehabilitation Plan Review • summarize/evaluate data • model results • LTRP Benchmarks • re-evaluate assessment protocol/requirements • where are we?

  31. LakeTrout Management

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