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Chinook salmon stock composition in Lake Huron: using otolith microchemistry as a natural marker of stream origin

Analysis of natural geochemical markers is a powerful, emerging  approach for the study of natal origins and movement of animals. Our  research will use otolith microchemistry to assign the rearing  origin of Chinook salmon in Lake Huron. Our main hypothesis is that  differences in elemental and isotopic concentrations among streams  and hatcheries will be reflected in Chinook salmon otoliths. Our  project objectives are to 1) test the hypotheses that differences  exist in elemental concentrations of otoliths of wild Chinook salmon  fry of known origin from Lake Huron and that differences in otolith  microchemistry are related to differences in water chemistry; 2)  test the hypothesis that otolith microchemistry can discriminate  hatchery from wild Chinook salmon fry; and 3) develop and test a  statistical model based on otolith microchemistry to discriminate  the rearing origin of Chinook salmon from the recreational fishery.  Water samples will be collected from Lake Huron tributaries and  hatcheries that supply Chinook salmon and will be analyzed using  inductively coupled plasma optical emission spectrometry/mass  spectrometry (ICP-OES/MS) and multicollector ICP-MS (MC-ICP-MS).  Chinook salmon fry will be collected from streams and hatcheries  throughout the Lake Huron basin and otoliths will be removed.  Otolith elemental and stable isotopic microchemistry will be  determined by laser ablation ICP-MS and MC-ICP-MS. With these data,  statistical models will be developed to discriminate stream and/or  hatchery origin. The ability of otolith microchemistry to identify  stock composition will be tested using adult Chinook salmon sampled  from Lake Huron through existing OMNR and MiDNR sampling programs.  Statistical models will be used to assign natal origin to adults and  to test for spatial variation in catch composition.

Status
In progress
Type
Project
Start Date
End Date
Researchers
Yolanda MorbeyPrincipal Investigator
Associated with 2 projects
Brian FryerResearcher
Associated with 1 projects
David GonderResearcher
Associated with 1 projects
Jim JohnsonResearcher
Associated with 1 projects
Agencies
Great Lakes Fishery Commission $ 27,962.00CADActual

Funding 54 projects for a total of $5,089,137.00

Funding 5 projects for a total of $165,802.00

Funding 1 projects for a total of $0.00
Scope of Study
Field Investigation
Scale of Phenomena
Landscape
Organism
Population
Impact of Pollutants
Exotic Species
Processes
Natural Physical/Geological Processes
Resource Management
Fisheries
Lake Basin Connecting Channels
Lake Huron
State Province
Michigan
Ontario
Annex Numbers
Research & Development
Surveillance and Monitoring
General
Annex

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