Doug Sigourney MSc.

PhD. Candidate Biology, University of Massachusettes-Amherst

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B.Sc. Zoology, University of New Hampshire-Durham.
M.Sc. Wildlife and Fisheries Conservation, University of Massachusetts-Amherst


Co-Supervisors: Rick Cunjak & Ben Letcher
Started: January 2002

Addressing growth rate variation in three populations of Atlantic salmon distributed along a latitudinal gradient.

The goal of this project is to address the reasons for size variation in cohorts of juvenile Atlantic salmon both within and among systems through the development of a growth model. Using data on size trajectories of individually marked individuals I hope to develop a model that will capture these trajectories. The parameters will be estimated directly from field data.

By analyzing the parameters estimated for different populations I hope to learn more about what mechanisms may be responsible for growth variation. I also hope to capture the seasonal differences in growth. Because individuals were marked with unique identifiers, I will also be able to use the vast array of mark-recapture models to address questions of survival (Lebreton et al., 1998). Through the use of survival models I will try explore whether or not there is evidence of size selection among these systems that may be contributing to this pattern of size variation.


Sigourney, D. 2003. Age and growth, sexual maturity and distribution of Atlantic Halibut (Hippoglossus hippoglossus L.) in the Gulf of Maine-Georges Bank region. Southern New England Chapter of AFS. Ramada Inn, Auburn, MA. Winter Meeting

Sigourney, D. 2003. Electroshocking and PIT tagging juvenile Atlantic salmon: Are there interactive effects on growth and survival?. Connecticut River Migratory Fish Restoration Research Forum. Hadley, MA

Sigourney, D. 2003. Seasonal Variation in Juvenile Growth Among Three Populations of Atlantic Salmon. American Fisheries Society International Symposium. Quebec City, Canada.