January 16, 2015Asian carp continue to knock on the door of theGreat Lakes, based on eDNA sampling results released last week by the U.S. Fish and WildlifeService. The sampling data, collected in October, show the presence of bighead or silver carpDNA throughout the Chicago Area Waterway System (CAWS). Most alarming is detection ofcarp DNA very near the lock in downtown Chicago – less than one city block from LakeMichigan.
In the face of this threat, last winter the U.S. Army Corps of Engineers released its Great Lakes-Mississippi River Interbasin Study (GLMRIS) with no clear recommendation for next steps toprevent Asian carp and other aquatic invasive species from moving between the Great Lakesand Mississippi River. The GLMRIS report does, however, identify restoring the natural dividebetween the two waterways as the one long-term solution effective in preventing themovement of aquatic invasive species between the Great Lakes and Mississippi River basins.
The report identified 13 invasive species at significant risk of moving between the waterways.Despite this finding, agencies and elected officials have yet to commit to this solution.A committee of key, diverse regional stakeholders known as the “Chicago Area WaterwaySystem Advisory Committee” has been formed with a goal to reach consensus on a set ofrecommendations to elected and appointed local, state and federal officials and the public onshort-and long-term measures to prevent Asian carp and other aquatic invasive species frommoving between the Mississippi River and Great Lakes basins through the CAWS. The AdvisoryCommittee is working toward a deadline of Dec. 15, 2015, with interim work products asappropriate.
In the shorter term, the people of the Great Lakes and Mississippi River basins need quickaction to reduce the risk of invasive species moving between these two great waters. While nosubstitute for a permanent solution to the problem, immediate risk-reduction steps can betaken, including:
- Design of a new engineered channel to be constructed in the approach to the BrandonRoad lock, a potentially effective location for reducing one-way movement of speciestowards the Great Lakes;
- Evaluation, engineering, and design of control technologies to deploy in the approachchannel and the Brandon Road lock structure; and
- Research to further evaluate reconfiguring locks as a means to control aquatic invasivespecies while maintaining the health of native aquatic life and habitat.
DNA evidence is an early detection tool to understand the potential movement of carp, andtesting results have consistently found DNA hits on a path closer and closer to the Great Lakesover the past several years of testing. We cannot afford to wait until a breeding populationshows up in the Chicago River. Prevention needs to happen now, and the U.S. Army Corps ofEngineers and other key decisionmakers should take swift action.
Background: The recently released U.S. Fish and Wildlife eDNA results can be found here: