In recent years, the Margaree Salmon Association in northern Cape Breton has been utilizing electrofishing as a method to monitor fish populations in the Margaree River. This technique involves using an electric current to briefly stun fish, allowing crews to safely capture, measure, and identify them before releasing them back into the river.
According to Michael Fabiano, the association’s conservation coordinator, electrofishing operations typically run from May to late September. Despite processing thousands of fish each season, the mortality rate stands at around two percent. Fabiano emphasizes the paramount importance placed on fish safety, ensuring that electrofishing is avoided when water temperatures are too high.
To minimize risks and ensure safe handling of electricity in water, crew members wear heavy rubber gloves and chest waders. Through careful adjustments of current levels, fish are momentarily stunned to facilitate data collection without causing harm. Crews conduct surveys along the 120-kilometre river to pinpoint productive streams and evaluate the overall well-being of the fish population, predominantly consisting of trout and Atlantic salmon, with occasional sightings of eels and lampreys.
This season, the association reports capturing and releasing approximately 1,800 fish across nine streams, a decrease from the previous year. Fabiano attributes this decline partly to the adverse conditions experienced last year, including low water levels and high temperatures due to a severe drought that impacted the Margaree River.
Paul MacNeil, the association’s president, highlights the heightened focus on scientific research in response to reduced data collection efforts by Fisheries and Oceans Canada over the past five years. Established in 1982, the association aims to secure reliable data for monitoring river health amid changing climate patterns. To bridge the data gap, the association collaborated with the Chéticamp River Salmon Association to procure electrofishing equipment, enabling more precise assessment of juvenile fish populations compared to traditional fish counting methods.
MacNeil advocates for electrofishing as a comprehensive tool for capturing juvenile fish within specific territories, providing valuable insights for conservation efforts.
