In recent years, the Margaree Salmon Association in northern Cape Breton has been employing electrofishing as a method to monitor fish populations in the Margaree River. This technique involves using an electric current to temporarily stun fish, allowing crews to safely capture, measure, and identify them before releasing them back into the water.
Michael Fabiano, the conservation co-ordinator of the association, stated that electrofishing activities take place from May to late September with a low two percent mortality rate among the thousands of fish handled each season. Safety protocols prioritize the well-being of the fish, ensuring electrofishing is avoided when water temperatures are too high.
Crew members carefully regulate the electric current to cause fish to briefly roll over, minimizing stress. They wear protective gear like heavy rubber gloves and chest waders to prevent any accidents while working with electricity in water. Throughout the 120-kilometre river, crews survey various locations to identify the most productive streams and evaluate the overall health of the fish population, primarily consisting of trout and Atlantic salmon, with occasional sightings of eels and lampreys.
This season, the association has already caught and released approximately 1,800 fish from nine streams, marking a decrease compared to the previous year. Fabiano attributed this decline to the challenging conditions experienced in the previous year, including low water levels and high temperatures due to a severe drought that impacted the Margaree River.
Paul MacNeil, the association’s president, highlighted the increased focus on scientific research due to reduced data collection efforts by Fisheries and Oceans Canada over the past five years. The establishment of reliable data is crucial for monitoring river health amid changing climate patterns. To address the data gap, the association collaborated with the Chéticamp River Salmon Association to acquire electrofishing equipment, enabling them to gather more precise juvenile fish population data compared to traditional fish counting methods.
MacNeil emphasized the significance of electrofishing in capturing a comprehensive view of the juvenile fish population in specific territories along the river. This method supplements the association’s existing fish counting efforts, providing valuable insights for conservation and management strategies as climate conditions evolve.
