Residents in the Comox Valley on central Vancouver Island are uniting to eradicate invasive American bullfrogs from local lakes and water bodies. The Tsolum River Restoration Society is initiating workshops to enable individuals to establish tadpole traps, as these large bullfrogs are a threat to native species.
American bullfrogs, known to be twice the size of other frogs in B.C., consume various species, including frogs, salamanders, insects, and even small animals like rodents and snakes, according to the Invasive Species Council of B.C. One resident diligently checks the tadpole traps set in Maple Lake, just north of Cumberland, every two days to safeguard fragile ecosystems.
Bruce Moffat, a society volunteer, initially adopted a “live and let live” approach upon encountering bullfrog tadpoles a few years back. However, his perspective shifted when he found a vast number of invasive bullfrog tadpoles while canoeing in Maple Lake last year. Moffat emphasized the urgent need to address the issue, as these bullfrogs can severely impact local amphibians, fish, and insects, subsequently affecting birds and larger species.
The Invasive Species Council of B.C. highlights the bullfrogs’ significant appetite as a threat to endangered species such as the northern red-legged frog and the western painted turtle. Gail Wallin, the executive director of ISCBC, emphasized the illegality of relocating tadpoles or mature American bullfrogs to new areas, stressing the importance of controlling their populations.
While complete eradication may be unfeasible, Wallin encouraged population control efforts and emphasized the importance of documenting their activities. She suggested trapping and euthanizing the bullfrogs using safe methods to protect both individuals and the environment.
Wallin acknowledged that the tadpole traps set by Comox Valley residents would have a short-term impact on local populations, underscoring the necessity for ongoing community endeavors to manage bullfrog populations effectively. Katie Gair, the project co-ordinator at the Tsolum River Restoration Society, mentioned that workshops are being conducted in the Comox Valley to educate residents on constructing tadpole traps.
These traps, designed to attract and temporarily confine bullfrog tadpoles, are cost-effective and made from readily available materials. Gair emphasized that the workshops aim to empower community members to implement these traps on their properties and in parks with appropriate authorization.
Additionally, Gair highlighted the distinct features of bullfrog tadpoles, noting their larger size compared to native species, cream-colored belly, and mottled green speckling. She emphasized that removing bullfrogs is one element of a comprehensive strategy to safeguard local species.
