Rainbow Trout Migration Patterns in the Saugeen River Watershed


The goal of this study is to investigate rainbow trout migration patterns and passage success within the Saugeen River watershed, with a focus on the impacts of the removal of the Truax Dam in Walkerton, Ontario. Baseline phases of this study were conducted in Spring 2018, Fall/Winter 2018/2019 and Spring 2019. In each phase 50 adult rainbow trout were captured at the Denny's Dam fishway in Southampton, implanted with coded radio transmitters and tracked throughout the watershed (Saugeen River and associated tributaries) using a combination of mobile telemetry, fixed tracking stations, and aerial telemetry surveys.

The Truax Dam was removed in August 2019 as part of a fisheries offset and compensation project. Post-removal radiotelemetry phases began in Fall/Winter 2019/2020 and continue to-date. The data collected has provided valuable insight regarding inter-seasonal and inter-annual variation in rainbow trout migration patterns and motivation, use of spawning areas and other habitats, and the impact of potential barriers (Denny's Dam, Truax Dam/footprint, Carrick Dam, Maple Hill Dam) within the Saugeen River for continued upstream migration.


Find additional details regarding the fisheries offset and compensation project here, the biomass electrofishing survey component of this project here, the redd count survey component here, and the videographic survey component here.

The most recent annual summary of all project component findings to-date (2022) can be found here.
A detailed summary of all radiotelemetry findings to-date (2022) can be found here.


We have also animated the radiotelemetry datasets to provide a visual representation of upstream and downstream migration and to illustrate the seasonal blockage effects that the four dams have on rainbow trout passage in the Saugeen River and how these have changed before and after the removal of the Truax Dam. Baseline datasets collected in Spring 2018, Fall 2018 and Spring 2019 as well as post-dam removal datasets collected in Fall 2019, Spring 2020, Fall 2020, Spring 2021 and Spring 2022 have been animated and can be found below. Additional post-removal datasets will be animated in the future.
Baseline Datasets
Click to view Spring 2018 telemetry:
trout telemetry

Click to view Fall 2018 telemetry:
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Click to view Spring 2019 telemetry:
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Post-Dam Removal Datasets
Click to view Fall 2019 telemetry:
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Click to view Spring 2020 telemetry:
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Click to view Fall 2020 telemetry:
Fall 2020 telemetry animation still

Click to view Spring 2021 telemetry:

2021 video preview

Click to view Spring 2022 telemetry:

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Summary Data Tables:
Spring Studies
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Fall Studies
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News coverage of this project:


fish surgery rainbow trout
mobile fish tracking
radiotracking rainbow trout
aerial fish tracking