In Lake Huron, fish are congregating in large numbers near an Ontario nuclear plant, creating a remarkable sight captured in exceptional detail. Filmmakers Yvonne Drebert and Zack Melnick are utilizing a specialized $250,000 underwater drone, one of just a handful worldwide and the sole one operating in freshwater, to film areas of the Great Lakes that are typically inaccessible due to depth or remoteness.
A sneak peek of footage from one such dive has been shared with CBC News ahead of a livestream event scheduled for Earth Day to promote their new documentary series, “Hidden Below: the Great Lakes.” The drone will specifically focus on the warm water outflow from the Bruce Nuclear Generating Station near Tiverton, Ont., where fish congregate for shelter and food.
Referred to as “fish city,” the area near the Bruce station is renowned for attracting a diverse array of fish species due to the elevated water temperature. The stunning imagery captured by Melnick and Drebert showcases millions of gizzard shad shimmering in the sunlight, accompanied by various other species like bigmouth buffalo, walleye, and trout.
Scientists suggest that the warm water discharge from the nuclear plant creates a rich food source for the fish, promoting nutrient cycling and algae growth. However, experts caution that the concentration of fish in these thermal plumes may indicate a significant ecosystem shift caused by invasive species like zebra and quagga mussels, which have disrupted the food chain in the Great Lakes since their introduction in the 1980s.
Notably, the warmer water conditions resulting from industrial activities could have adverse effects on native fish populations adapted to colder waters. Concerns have been raised about the impact on communities like the Saugeen Ojibway Nation, whose livelihood relies on fishing in Lake Huron.
As discussions around the ecological implications of the “fish city” continue, it serves as a reminder of the delicate balance within the Great Lakes ecosystem and the need to safeguard these vital resources for future generations.
