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 momentarily stun fish, allowing crews to safely capture, measure, and identify them before releasing them back into the river.
Michael Fabiano, the conservation co-ordinator at the association, mentioned that electrofishing operations take place from May to late September, with a minimal mortality rate of two percent among the thousands of fish handled each season. He emphasized the importance of prioritizing fish safety, ensuring that electrofishing is not conducted when water temperatures are too high.
To minimize the risk of electrical hazards, crew members wear heavy rubber gloves and chest waders while setting current levels to temporarily immobilize fish. The team surveys various spots along the 120-kilometre river to pinpoint the most fruitful streams and evaluate the overall health of the fish population, dominated by trout and Atlantic salmon, with occasional eels and lampreys.
This season, the association has already captured and released around 1,800 fish across nine streams, showing a decrease from the previous year. Fabiano attributed this decline to the challenging conditions experienced last year, including low water levels and high temperatures that significantly impacted the river’s ecosystem.
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. Established in 1982, the Margaree Salmon Association sought reliable data to monitor river health in response to shifting climate patterns.
To address the data gap, the association collaborated with the Chéticamp River Salmon Association to acquire electrofishing equipment. MacNeil explained that while members also conduct fish counts by swimming the river, electrofishing provides more precise data on juvenile fish populations.
In summary, the Margaree Salmon Association’s use of electrofishing serves as a critical tool in monitoring and safeguarding the fish populations of the Margaree River amidst changing environmental conditions.