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 temporarily stun fish, enabling crews to safely capture, measure, and identify them before releasing them back into the river. Michael Fabiano, the conservation co-ordinator of the association, explained that electrofishing operations take place from May to late September with a two percent mortality rate noted among the thousands of fish handled each season.
Ensuring the safety of the fish is a top priority for the association, as Fabiano emphasized the avoidance of electrofishing in high water temperature conditions. Crews carefully regulate the current levels to cause fish to roll over momentarily, wearing protective gear such as heavy rubber gloves and chest waders to prevent any accidents. During Fabiano’s tenure of 18 months, no crew members have experienced any serious electric shocks while carrying out the electrofishing surveys.
The teams conduct surveys at various locations along the 120-kilometre river to determine the most productive streams and assess the overall health of the fish population. The catch primarily consists of trout and Atlantic salmon, with occasional appearances of eels and lampreys, accounting for about 95% of the catch. This season, the association has caught and released approximately 1,800 fish across nine streams, marking a decrease from the previous year.
Paul MacNeil, the president of the association, highlighted the increased focus on scientific research due to reduced data collection efforts by Fisheries and Oceans Canada over the past five years. Established in 1982, the group aims to gather reliable data to monitor river health amid changing climate conditions. To bridge the data gap, the association collaborated with the Chéticamp River Salmon Association to procure electrofishing equipment. While traditional fish counting methods involve swimming the river, MacNeil stressed the importance of electrofishing for obtaining more accurate data on juvenile fish populations in specific territories.
Overall, the Margaree Salmon Association’s proactive approach to fish population monitoring underscores their commitment to preserving the health of the Margaree River ecosystem amidst environmental challenges.