In recent years, the Margaree Salmon Association in northern Cape Breton has employed 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 association’s conservation co-ordinator, mentioned that electrofishing operations typically run from May to late September and result in a minimal two per cent mortality rate among the thousands of fish handled each season.
Emphasizing fish safety as their top priority, Fabiano highlighted that electrofishing is avoided when water temperatures are too high. Crews carefully regulate current levels to ensure fish are momentarily affected, causing them to roll over for just a few seconds. To safeguard against electrical hazards in the water, team members wear protective heavy rubber gloves and chest waders, with no incidents of serious shocks reported during Fabiano’s tenure.
The association’s survey teams cover various locations along the 120-kilometre river to pinpoint the most productive streams and evaluate the overall health of the fish population. The catch composition primarily consists of trout and Atlantic salmon, with occasional eels and lampreys making up about 95 per cent of the total. This season, approximately 1,800 fish have been captured and released across nine streams, showing a decrease from previous years, which could be attributed to challenging environmental conditions experienced last year, including low water levels and high temperatures.
Paul MacNeil, the association’s president, explained that the group intensified its scientific research efforts due to reduced data collection by Fisheries and Oceans Canada over the past five years. Founded in 1982, the association aimed to gather reliable data to monitor river health amidst shifting climate patterns. To bridge the data gap, the association collaborated with the Chéticamp River Salmon Association to acquire electrofishing equipment. While manual fish counting in the river is also conducted, MacNeil stressed that electrofishing provides more precise data on juvenile fish populations within specific territories.
In conclusion, the Margaree Salmon Association’s use of electrofishing as a monitoring tool reflects their commitment to preserving fish populations in the Margaree River and adapting to evolving environmental challenges for sustainable conservation efforts.