The Margaree Salmon Association in northern Cape Breton has been utilizing electrofishing to monitor fish populations in the Margaree River over recent years. This method involves using an electric current to temporarily stun fish, allowing crews to safely capture, measure, and identify them before releasing them back into the river. Michael Fabiano, the association’s conservation coordinator, mentioned that electrofishing operations are conducted from May to late September and have a mortality rate of about two percent among the thousands of fish processed each season.
Ensuring the safety of the fish is paramount for the crews, according to Fabiano, who stated that electrofishing is avoided when water temperatures are too high. Crews carefully regulate the electric current to cause fish to briefly roll over, ensuring minimal impact. To safeguard against potential electric shock hazards, crew members wear heavy rubber gloves and chest waders, with no serious incidents reported during Fabiano’s tenure with the group.
The teams conduct surveys along the 120-kilometer river to pinpoint its most productive streams and evaluate the overall health of the fish population. The catch primarily comprises trout and Atlantic salmon, with occasional appearances of eels and lampreys. This season, approximately 1,800 fish have been caught and released across nine streams, a decline from the previous year, which Fabiano attributes partly to the challenging conditions experienced last year due to low water levels and high temperatures.
Paul MacNeil, the association’s president, highlighted the increased focus on scientific research in response to reduced data collection efforts by Fisheries and Oceans Canada in recent years. Established in 1982, the association sought to gather reliable data for monitoring river health amid changing climate conditions. To address the data gap, the association collaborated with the Chéticamp River Salmon Association to procure electrofishing equipment. While traditional fish counts are still conducted by members swimming in the river, MacNeil emphasized that electrofishing provides more accurate data on juvenile fish populations within specific territories.
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