In recent years, the Margaree Salmon Association, situated in northern Cape Breton, has been employing electrofishing as a method to monitor fish populations within the Margaree River. This technique involves using an electric current to momentarily stun fish, allowing crews to safely capture, measure, and identify them before returning them to the water.
Michael Fabiano, the conservation co-ordinator of the association, mentioned that electrofishing operations are conducted from May to late September, with a minimal two per cent mortality rate among the thousands of fish processed each season. Ensuring fish safety is paramount, and electrofishing is avoided when water temperatures are deemed too high.
To minimize harm and ensure crew safety while working with electricity in water, team members wear heavy rubber gloves and chest waders. Throughout Fabiano’s 18-month tenure with the group, no serious incidents involving electrical shocks have been reported.
Crews conduct surveys along the 120-kilometre river to pinpoint the most productive streams and evaluate overall fish well-being. The catch predominantly consists of trout and Atlantic salmon, occasionally including eels and lampreys, making up approximately 95% of the total.
This season, the association has captured and released around 1,800 fish across nine streams, representing a decrease from the previous year. Fabiano attributed this decline to the challenging conditions experienced the year before, with low water levels and high temperatures significantly impacting the Margaree River.
Paul MacNeil, the association’s president, highlighted the group’s heightened scientific research efforts in response to reduced data collection by Fisheries and Oceans Canada in the past five years. Established in 1982, the association sought dependable data to monitor river health amidst shifting climate patterns.
To bridge the data gap, the association collaborated with the Chéticamp River Salmon Association to procure electrofishing equipment. While manual fish counting is also conducted in the river, MacNeil emphasized that electrofishing provides more precise data on juvenile fish populations.
For more information and top stories, visit the provided source link.