Residents in the Comox Valley on central Vancouver Island are joining forces to eliminate invasive American bullfrogs from local lakes and water bodies. The Tsolum River Restoration Society is launching workshops to enable individuals to install tadpole traps, citing concerns that the oversized bullfrogs pose a threat to indigenous species.
According to the Invasive Species Council of B.C., American bullfrogs, which can grow twice the size of other frog species in the region, consume a variety of organisms, including frogs, salamanders, insects, and small mammals and reptiles.
One resident regularly inspects the tadpole traps he set up at Maple Lake, just north of Cumberland, every other day, as part of efforts to safeguard fragile ecosystems. Bruce Moffat, a society volunteer, initially adopted a “live and let live” approach towards bullfrog tadpoles a few years ago. However, his perspective shifted when he encountered a significant concentration of invasive bullfrog tadpoles in Maple Lake.
Moffat expressed concern that a thriving population of American bullfrogs could severely impact local amphibians, fish, and insects, leading to repercussions for birds and larger species. The Invasive Species Council of B.C. warns that the bullfrogs’ voracious appetite poses a threat to endangered species like the northern red-legged frog and the western painted turtle.
The executive director of ISCBC, Gail Wallin, emphasized the illegality of relocating tadpoles or mature American bullfrogs to new areas. While eradicating them entirely may be unfeasible, Wallin advocates for population control measures and encourages documenting their activities. She suggested humane trapping and euthanizing methods for managing bullfrog populations.
Wallin commended the short-term impact of the tadpole traps set up by Comox Valley residents but stressed the need for ongoing community engagement to regulate populations. Katie Gair, project coordinator at the Tsolum River Restoration Society, highlighted the workshops designed to educate residents on constructing and utilizing tadpole traps. Gair noted that these traps, costing around $25 each, are crafted from readily available materials and are supplied with funding for materials and training.
Residents are encouraged to participate in the workshops to learn how to identify and capture bullfrog tadpoles. Gair outlined the distinctive features of bullfrog tadpoles, including their larger size and cream-colored belly with mottled green speckles, distinguishing them from native species. Removing bullfrogs is part of a comprehensive strategy to safeguard local wildlife, as outlined by the Tsolum River Restoration Society.
