ATHENS, Texas--Giant salvinia, an extremely invasive floating aquatic fern from southeastern Brazil, was found on Caddo Lake by a Louisiana research biologist on May 29, 2006. An initial survey, conducted by Texas Parks & Wildlife Department (TPWD) personnel, revealed a well-established population of giant salvinia in Jeem’s Bayou on the Louisiana portion of the lake. The infestation was estimated to cover more than 150 acres.

The presence of giant salvinia in one of the most sensitive regions of the state prompted an immediate, aggressive response from both Texas and Louisiana officials to contain the infestation and prevent further expansion. Chemical treatment of the infestation on Caddo Lake began within days of its discovery. An estimated 190 acres of giant salvinia were treated by vegetation control crews from TPWD and the Louisiana Department of Wildlife and Fisheries. Repeated treatments and surveys are planned throughout the summer to eliminate any remaining colonies.