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Coordination Workshops Concerning Lake Trout Age-1 Mortality in the Great Lakes

Within the Great Lakes, decreased first-year survival of stocked   lake trout is commonly observed concurrent with increases in   abundance of adult lake trout.  In Lake Superior, this resulted in   the transition to a self-sustaining wild population.  In Lake   Ontario, however, decreased first- year survival of stocked lake   trout followed by a rapid decline in overall population abundance.    The different outcomes experienced in Lakes Superior and Ontario   raise questions regarding what can be expected for other lakes when   alewife predation on lake trout egg and fry and alewife-caused early   mortality syndrome are substantially reduced.  Currently in Lake   Huron, alewife abundance has decreased to an extremely low level and   adult lake trout stocks have increased rapidly.  Yet, even with   continued success in sea lamprey control, two very different   prognoses exist for Lake Huron based on what previously was observed   in Lakes Superior and Ontario: a transition to a self-sustaining   wild population or a rapid overall decline in lake trout population   abundance.       We propose to hold two workshops to address some of the major   uncertainties associated with first year survival of lake trout.    Objectives for these workshops will include:  (1) Compare methods for evaluating first year survival of stocked   fish, particularly lake trout.   (2) Identify and compare temporal processes that affect first year   survival of stocked lake trout among the Great Lakes.  (3) Evaluate the effectiveness of various stocking strategies in   maintaining first year survival of stocked lake trout in relation to   changes in adult densities.   (4) Evaluate the effectiveness of various stocking and management   strategies that enhance lake trout reproduction in relation to   changes in food webs and in adult densities.   (5) Evaluate management strategies for maintaining spawning stock   density in the face of declining first year survival of stocked lake   trout.  (6) Recommend future research to improve our understanding of the   first year survival of stocked lake trout, and associated management   strategies for maximizing the probability of transitioning to self   sustaining populations. 

Status
In progress
Type
Project
Start Date
End Date
Researchers
Travis BrendenPrincipal Investigator
Associated with 5 projects
Ji HeResearcher
Associated with 2 projects
Agencies
Great Lakes Fishery Commission $ 8,746.00USDActual

Funding 54 projects for a total of $5,089,137.00
Scale of Phenomena
Population
Processes
Natural Ecological Processes
Resource Management
Fisheries
Lake Basin Connecting Channels
Lake Erie
Lake Huron
Lake Michigan
Lake Ontario
Lake Superior
Annex Numbers
Research & Development
Surveillance and Monitoring
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Annex
  • Annex Numbers
    Annex Numbers
    Research & Development
    Surveillance and Monitoring
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

The Great Lakes - St. Lawrence Research Inventory is an
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up-to-date information about research projects in the
Great Lakes - St. Lawrence Region.