Eugene H. Buck Specialist in Natural Resources Policy
Harold F. Upton Analyst in Natural Resources Policy
Charles V. Stern Analyst in Natural Resources Policy
Four species of non-indigenous Asian carp are invading U.S. waterways, resulting in a variety of concerns and problems. Two species—bighead and silver carp—are of particular concern, based on the perceived degree of potential danger. Current controversy relates to what measures might be necessary and sufficient to prevent movement of Asian carp from the Mississippi River drainage into the Great Lakes through the Chicago Area Waterway System. Bills have been introduced in the 111th Congress to improve control of these species.
According to the Great Lakes Fishery Commission, Asian carp are a significant threat to commercial and recreational fisheries of the Great Lakes. Asian carp populations could expand rapidly and change the composition of Great Lakes ecosystems. Native species could be harmed because Asian carp are likely to compete with them for food and modify their habitat. It has been widely reported that Great Lakes fisheries generate economic activity of approximately $7 billion annually. Although Asian carp introduction is likely to modify Great Lakes ecosystems and cause harm to fisheries, studies forecasting the extent of potential harm are not available. Therefore, it is not possible to provide estimates of potential changes in the regional economy or economic value (social welfare) by lake, species, or fishery.
The locks and waterways of the Chicago Area Waterway System (CAWS) have been a focal point for those debating how to prevent Asian carp encroachment on the Great Lakes. The CAWS is the only navigable link between the Great Lakes and the Mississippi River, and many note the potential of these waterways to facilitate invasive species transfers from one basin to the other. The U.S. Army Corps of Engineers has constructed and is currently operating electrical barriers to prevent fish passage. However, in light of recent tests indicating the potential presence of Asian carp in the Great Lakes, increased federal funding to prevent fish encroachment has been announced by the Obama Administration, and calls to permanently separate the two basins have grown. The potential closure of existing navigation structures in the CAWS and the permanent separation of the basins remains the most contentious issue related to Asian carp control, and a long-term solution has yet to be decided.
On December 21, 2009, the State of Michigan filed suit against the State of Illinois, the U.S. Army Corps of Engineers, and the Metropolitan Water Reclamation District of Greater Chicago. Michigan has asked the U.S. Supreme Court to order closure of shipping locks near Chicago to prevent Asian carp from invading the Great Lakes. On January 19, 2010, the Supreme Court refused to order emergency measures sought by the State of Michigan to stop the migration of invasive Asian carp toward Lake Michigan from rivers and a sanitary canal in Illinois. Without comment, the Court refused to issue a preliminary injunction that would have closed waterway locks and required other temporary measures in reaction to the discovery of Asian carp upstream in Illinois rivers.
In the 111th Congress, Section 126 in Title I of P.L. 111-85 directed the U.S. Army Corps of Engineers to implement additional measures to prevent aquatic invasive species from bypassing the Chicago Sanitary and Ship Canal Dispersal Barrier Project and dispersing into the Great Lakes. Other bills have been introduced to list Asian carp species as injurious under the Lacey Act (H.R. 48, H.R. 3173, S. 237, S. 1421), and to direct various federal agencies to take specific actions to increase control over and restrict the spread of Asian carp (H.R. 51, H.R. 4472, S. 237, S. 2946). .
Date of Report: February 26, 2010
Number of Pages: 20 Order Number: R41082 Price: $29.95
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