Guardians of the Deep: Thunder Bay's Latest Weapon in the Battle Against Sea Lamprey

In a crucial move to protect the precious ecosystems of Lake Superior, Fisheries and Oceans Canada has unveiled its latest defense: a state-of-the-art sea lamprey trap on Thunder Bay's Current River. This isn't just any trap; it's a testament to decades of relentless effort and a proactive step in preserving the region's iconic fish populations from the grip of an ancient, invasive predator.

For over 60 years, the Great Lakes Fishery Commission (GLFC), in partnership with Canadian and U.S.

agencies, has been on the front lines of what's often described as one of the most successful international conservation efforts in history. Their mission? To combat the parasitic sea lamprey, a species that, left unchecked, can decimate native fish stocks like lake trout, salmon, and whitefish.

The newly installed trap on the Current River is designed with precision.

It targets adult sea lampreys as they embark on their annual spawning migration, aiming to ascend the river to reproduce. The trap's ingenious design allows for the capture of these destructive invaders while ensuring that native fish species can be safely sorted and released back into the river to continue their journey.

This selective approach is vital for maintaining biodiversity and minimizing impact on non-target species.

Sea lampreys are an ecological nightmare. Lacking a jaw, they attach to host fish with their disc-shaped mouths, using their rasping tongues to feed on blood and bodily fluids. A single sea lamprey can kill up to 40 pounds of fish in its lifetime.

Their introduction into the Great Lakes, primarily via shipping canals in the early 20th century, led to catastrophic declines in fish populations, fundamentally altering the aquatic food web and devastating commercial and recreational fisheries.

However, thanks to persistent control measures—including traps like the one on Current River, targeted lampricides, and barrier dams—the tide has turned.

Since control efforts began in the 1950s, sea lamprey populations in Lake Superior have been reduced by an astonishing 85 to 95 percent. This success story has allowed native fish populations to rebound, bolstering the region's economy and supporting a vibrant recreational fishing industry that contributes billions annually across the Great Lakes basin.

While this new trap represents a significant advancement, the battle is far from over.

Invasive species management is a continuous endeavor, requiring vigilance, innovation, and sustained funding. The GLFC and its partners remain committed to researching and deploying new methods, ensuring that future generations can continue to enjoy the natural splendor and rich aquatic life of the Great Lakes.

The Current River trap is more than just a piece of equipment; it's a symbol of hope and a powerful reminder of what dedicated conservation efforts can achieve.

It reinforces the critical need to protect our natural heritage and stands as a guardian against threats that imperil the delicate balance of our freshwater giants.