Electrofishing Surveys to Determine Changes in Fish Community Biomass
Biotactic established twenty-two long term monitoring sites (66 sampling subsections) across the Saugeen River watershed within which annual biomass electrofishing surveys are performed to monitor the change in the fish community as a function of the removal of the Truax Dam in Walkerton, Ontario, as part of a fisheries offset and compensation project. Backpack electrofishing is used by trained staff to collect all fish within each site. Each fish is then identified, measured, weighed and safely released. Staff also conduct four yearly capture efficiency studies and use the calibration metrics produced to calculate species and site biomass and production values from the collected data.
Baseline phases of this study were conducted in Summer 2018 and 2019 and the Truax Dam was removed in August 2019 after surveys were completed. Post-impact monitoring has occurred Summer 2020, 2021, 2022 and 2023 with annual monitoring scheduled to continue until 2026. To-date 64358 fish from 47 different species have been collected across our permanent monitoring locations.
Find additional details regarding the fisheries offset and compensation project here, the radiotelemetry 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 (Summer 2024) can be found here.
A detailed summary of all radiotelemetry findings to 2022 can be found here. All radiotelemetry results were published in the scientific literature March 2024. A full free version of the publication can be found here.
