In recent years, the Margaree Salmon Association located in northern Cape Breton has been utilizing electrofishing as a method to monitor fish populations within the Margaree River. This technique involves using an electric current to momentarily stun the fish, enabling crews to safely capture, measure, and identify them before releasing them back into the river.
According to Michael Fabiano, the conservation co-ordinator of the association, electrofishing operations are conducted from May to late September with a mortality rate of approximately two percent among the thousands of fish processed each season. Safety measures are paramount, with crew members refraining from electrofishing in high water temperatures to ensure the well-being of the fish.
Crews carefully regulate current levels to cause fish to momentarily roll over, minimizing any potential harm. To prevent accidents while working with electricity in water, crew members don heavy rubber gloves and chest waders. Notably, there have been no serious shock incidents reported among crew members during Fabiano’s 18-month tenure with the organization.
The teams conduct surveys along the 120-kilometre river to pinpoint the most productive streams and evaluate the overall health of the fish population. The catch primarily consists of trout and Atlantic salmon, with occasional sightings of eels and lampreys. This season, the association has captured and released around 1,800 fish across nine streams, a decrease from the previous year likely influenced by challenging conditions such as low water levels and warm temperatures.
Association President Paul MacNeil highlighted the increased focus on scientific research due to reduced data collection by Fisheries and Oceans Canada over the last five years. Established in 1982, the association sought reliable data to monitor river health amidst changing climate conditions. To address the data gap, the association collaborated with the Chéticamp River Salmon Association to procure electrofishing equipment. While manual fish counts are also conducted in the river, MacNeil emphasized that electrofishing provides more precise data on juvenile fish populations.
In summary, the Margaree Salmon Association’s adoption of electrofishing reflects a proactive approach to conservation efforts and data collection in the face of evolving environmental challenges.
