A remarkable underwater video captured in Lake Huron has revealed a thriving ecosystem so rich in fish that it earned the nickname “fish city” and was featured in a documentary for Earth Day. However, the Saugeen Ojibway Nation (SON) is disputing the notion of fish abundance near the warm-water outflow of the Bruce Nuclear Generating Station, instead referring to the location as a “fish trap.”
SON has brought attention to the deaths of up to five million gizzard shad in 2025, as reported by the Department of Fisheries and Oceans (DFO) in a regulatory document from the Canadian Nuclear Safety Commission. This mass fish mortality incident occurred when an influx of fish obstructed the cooling water intake systems, leading to the shutdown of Bruce A Unit 2.
Additionally, SON highlighted the plight of several lake sturgeon, a species at risk and culturally significant in Anishnaabe teachings, which became stranded within a forebay pond at the nuclear plant. While one sturgeon was rescued in November, three remain in the area.
The controversy surrounding the “fish city” designation extends beyond imagery, raising concerns about how Bruce Power addresses ecological risks while seeking approval from regulators to boost plant capacities for increased electricity production.
SON argues that the warm water discharge acts as a lure for fish, creating an attraction and entrapment mechanism. Biologist Ryan Lauzon, affiliated with SON and the University of Toronto, emphasized that the thermal effluent acts as bait, drawing fish into the plant where they may become trapped due to limited exit options, posing risks to their well-being.
Bruce Power refutes claims that the plant was responsible for the 2025 fish die-off, attributing the incident to unusual environmental conditions and high shad numbers exacerbated by harsh winter weather. The utility implemented various deterrent measures and enhanced monitoring post-incident to prevent fish entrapment.
In efforts to enhance electricity generation, Bruce Power has sought regulatory approval to increase output from existing reactors by around 11% by 2030 without constructing new facilities. The final decision on this request is scheduled for July 2026, with the company asserting that the proposed power increase aligns with environmental safety measures.
Acknowledging a lack of clear benchmarks for assessing fish mortality, Bruce Power operates under stringent regulations without defined thresholds for unacceptable fish losses. The impact of the gizzard shad die-off on the lake’s ecosystem, noted by local stakeholders, emphasizes the interconnectedness of species in the region.
The cultural and ecological significance of fish, particularly gizzard shad, underscores the importance of sustainable practices and respect for aquatic life in the region. The portrayal of “fish city” fails to capture the broader implications of ecological disruptions and cultural values associated with fish populations.