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Lake Herring Recruitment Dynamics in Lake Superior

The proposed research will seek to identify and quantify biotic and   abiotic factors that regulate lake herring recruitment in Lake   Superior.  The proposed research is supported by and will be   coordinated through the Lake Superior Technical Committee, whose   members carry out stock assessments that will provide the data   necessary for modeling lake herring recruitment of putative stocks   across Lake Superior.  The findings will be useful for managing lake   herring fisheries in Lake Superior and throughout the Great Lakes   Basin.  Our objective is to identify and quantify biotic and abiotic   factors that regulate lake herring recruitment in Lake Superior, so   fishery managers can identify appropriate management strategies for   restoring lake herring throughout the lake and Basin.  Two research   questions will be addressed.  First, to what extent are abundances   of putative lake herring stocks congruent across Lake Superior?    Second, to what extent does abundance of adult lake herring,   abundance of major predator species, environmental stochasticity,   and fishing mortality determine year class strength of lake herring   stocks in Lake Superior?  We will use multi-species, multi-stock   Ricker stock-recruit models to quantify the appropriate spatial   scale and relative importance of biotic and abiotic factors as   regulators of lake herring recruitment in Lake Superior.  To   identify and quantify effects of biotic and abiotic factors on   recruitment variation, a sequence of multi-species Ricker stock-  recruitment models will be tested, in which factors are tested for   their explanation of overall lake herring recruitment variation.  To   quantify the appropriate spatial scale for modeling recruitment   dynamics, models will be fit to multiple spatial scales.  Model   selection will rely on AIC methods.  Lake herring recruitment will   be indexed from catch/effort in trawl surveys, lake herring stock   size will be indexed from catch/effort in graded-mesh gill-net and   trawl surveys, predator abundance will be indexed from catch/effort   in large-mesh gill-net (lake trout) and angler creel surveys (other   salmon and trout species), environmental stochasticity will be   indexed from regional temperature and wind-speed data, and fishery   mortality will be indexed from commercial fishing effort.

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Literature / Existing Data
Scale of Phenomena
Population
Processes
Natural Ecological Processes
Resource Management
Fisheries
Lake Basin Connecting Channels
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

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