Asian carp in Southeastern waters
The spread of four species of large carp—bighead, black, grass, and silver— threatens the Southeast’s renowned aquatic biodiversity and local outdoor economies. The U.S. Fish and Wildlife Service and its federal and state partners are on the front line fighting Asian carp in southeastern waters.
The asian carp problem
Extensive flooding in the 1970s forced Asian carp into rivers, streams and lakes and the fish have continued to migrate. Large portions of the nation’s river systems are now occupied by one or more species of Asian carp. In recent years, these destructive fish have more rapidly expanded their range and numbers. When large populations of Asian carp become established, they can pose a risk to human safety and native wildlife.
In the Southeast, carp put the region’s aquatic biodiversity at risk. For example, silver and bighead carp out-compete native sport fish like crappie and largemouth bass. And black carp feed on the freshwater mussels that help keep our aquatic systems healthy by providing good water quality for people, waterfowl and other wildlife species. Consequently, these fish harm local economies that rely on fishing, boating, and waterfowl hunting.
A collaborative effort for controlling carp
Controlling Asian carp in our nation’s waters requires the Service and its partners to remain focused, effective, and innovative. Federal and state agencies will leverage scientific expertise, data collection, new technologies and strategic planning across the various river basins.
The Mississippi Interstate Cooperative Resource Association (MICRA) is a good example of collaboration. This partnership of 28 state agencies, and a handful of federal agencies and tribes, is developing a basin-wide perspective on Asian carp management and control. MICRA annually identifies priorities to address carp in the Mississippi River Basin and recommends state-led projects to be funded with Service dollars.
Bio-acoustic fish fence in Kentucky
Sound has shown promise as a potential barrier to Asian carp passage and is being tested at lock and dam structures on large rivers where carp abound. The Service is working with the U.S. Army Corps of Engineers, with the support of the Kentucky Department of Fish and Wildlife Resources, the Tennessee Wildlife Resources Agency, and other partners, to deploy a large-scale sound deterrent trial project at Barkley Lock and Dam in western Kentucky.
The goal of the bio-acoustic fish fence, also referred to as BAFF, is to reduce the movement of Asian carp through the locks. This will help protect hundreds of river miles in the Tennessee and Cumberland rivers that remain relatively untouched by carp. The BAFF, developed by U.K.-based Fish Guidance Systems, deploys a curtain of bubbles, light and sound to deter carp from the lock entrance without encumbering commercial and recreational navigation.
Installation of the BAFF at Barkley Lock and Dam began in July 2019. The system became operation in October 2019. A three-year field trial is the next step in determining the system’s effectiveness.
The BAFF project costs an estimated $7 million, which comes from the Great Lakes Restoration Initiative and leveraged financial support from the Service. The findings of the project will inform federal and state efforts to slow the spread of Asian carp and prevent their establishment in the Great Lakes.
Modified Unified Method
Kentucky is on the front lines of the war on carp. The Kentucky Department of Fish and Wildlife Resources, in February 2020, deployed the so-called Modified Unified Method of carp removal on Kentucky Lake with the assistance of the Service and U.S. Geological Survey as well as the U.S. Forest Service, the Tennessee Valley Authority and the states of Tennessee, Alabama and Mississippi. A series of boats, nets, underwater speakers and electro-fishing gear corrals the carp that have been pushed into a cove or narrow body of water. This carp-corralling method has been tested in Missouri and Illinois and proved mostly successful, removing as much as 90 percent of the fish from the targeted waters. Congress appropriated $25 million overall to the Service in fiscal year 2020 for the unified method and other carp-removal efforts around the country.
Despite unusually warm water temperatures and the need to navigate around natural and manmade snags, Asian carp were successfully herded and removed from Kentucky Lake. Over 69,000 pounds of fish, mostly Asian carp, were harvested from two bays. With slight alterations, Kentucky Fish and Wildlife expects to routinely use this method for removal efforts in appropriate areas.
Photos and video
- The New “Modified Unified” Method of Asian Carp Removal (Video courtesy of Kentucky Afield)
- Modified unified method at Pisgah Bay (B-roll, KDFWR)
- Modified unified method at Smith Bay (B-roll, Kentucky Afield)
- BAFF system installation and demonstration at Barkley Dam
- BAFF system (B-roll, Kentucky Afield)
- BAFF installation photos on Flickr courtesy of U.S. Army Corps of Engineers
- Electrofishing B-roll courtesy of Kentucky Department of Fish and Wildlife Resources
- Asian carp image library on Flickr
- Additional multimedia available on AsianCarp.us
- Combating the spread of Asian carp in Southeastern waters
- FWS statement on Asian carp control before the House Committee on Oversight and Government Reform, July 27, 2018
- Asian carp in Kentucky
- Asian carp in Tennessee
- Bio-Acoustic Fish Fence Questions and Answers
Angie Rodgers, Lower Mississippi River Fish and Wildlife Conservation Office
March 19, 2018 | 8 minute read
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