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Once deemed destructive, the sea lamprey, a species often scorned for its vampiric feeding habits, is now finding renewed respect among fisheries managers and environmentalists. In an encouraging shift of perspective, efforts are being ramped up to Support their populations and underline their essential role in our aquatic ecosystems.
Source: Animalogic/Youtube
Sea lampreys have long been misunderstood due to their history of decimating Great Lakes fisheries. These ancient, eel-like fish attach to their host with tooth-studded suction disks, draining body fluids and causing significant damage to species such as trout and salmon. However, this narrative is transforming as we begin to recognize the lamprey’s ecological worth.
In their native habitats, sea lampreys serve as “keystone species,” playing a vital role in maintaining the balance of marine and freshwater ecosystems. These ecological engineers contribute to water quality by filter feeding, providing sustenance for numerous predators, and playing a crucial part in the nutrient cycle. Their nesting activities even help maintain spawning habitats for other native fish species.
The Pacific Northwest tribes, who hold Pacific lampreys in high regard for their cultural and nutritional value, are leading efforts for their preservation. Moreover, international assessments highlight the need for urgent Conservation measures, with the species listed as “critically imperiled” in parts of the US and “threatened” in Mexico.
Despite this, in North America, appreciation for lampreys has been slow due to lingering bias from the Great Lakes catastrophe. However, the tide is turning, as seen in the remarkable recovery of lamprey populations in Maine’s Penobscot River following the removal of dams that once blocked their migration routes.
Connecticut is leading the charge in both sea lamprey recovery and education. This state’s proactive measures include removing barriers to migration and restoring extinct sea lamprey runs by relocating larvae and pre-spawn adults. Their efforts are helping to dispel misconceptions about these vital creatures and highlighting their significant contributions to the ecosystem.
Pacific lampreys, capable of climbing sheer waterfalls, face their challenges. Traditional fish ladders are difficult to navigate, leading to innovative solutions like specially-designed aluminum ramps. However, threats from non-native predators, habitat destruction, and Global warming persist.
Despite these challenges, the Pacific lamprey’s survival story is inspiring. Tribal-led efforts, including translocating pre-spawn adults and hatchery programs, have seen encouraging results with a dramatic increase in returning adults.
Unfortunately, the journey toward lamprey appreciation isn’t without roadblocks. For instance, Vermont’s dual approach of controlling lamprey populations in Lake Champlain while actively aiding their recovery in the Connecticut River system has caused confusion and concern among residents. However, ongoing educational efforts are gradually helping to change public perception.
Sea lampreys, having roamed our waters for over 340 million years, are an integral part of our ecosystem, despite their somewhat unconventional appearance and lifestyle. So, let’s take a cue from Connecticut and the Pacific Northwest tribes – celebrate these unsung heroes of our aquatic ecosystems.
As we move forward, remember this – we can all play a part in recovering sea lampreys. Whether advocating for their Conservation or simply understanding their role in the ecosystem, every action counts. Here’s to a future where the sea lamprey is respected and revered for its contribution to our world!

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