About 200 hunters brought in some 1,900 nutria, also known as swamp rats, in the annual Nutria Rodeo in Louisiana.

Veteran aquatic specialist David Brewster with Tennessee Valley Authority explains what water hyacinth is and how it can damage a lake.

Salvinia, a fast-growing invasive plant from South America, has been discovered in Guntersville Lake in Alabama. Officials with Tennessee Valley Authority are treating it in an attempt to control it from spreading.

Alabama wildlife officials are cautiously optimistic that invasive silver carp, which can wreak havoc on reservoir ecosystems, has not expanded its range in the state’s waterways.

Tennessee fisheries officials have confirmed the discovery of Silver carp, also known as Asian or jumping carp, in Chickamauga Lake.