Thanks for the link--here is an important paragraph from the website. I highlighted one sentence in red.
Harris Lake Hydrilla Management Project
Harris Lake, a reservoir in New Hill, North Carolina, covers 4,100 acres in southwestern Wake County and southeastern Chatham County. Hydrilla was first observed in the lake in 1988, and since that time a substantial infestation has developed. Hydrilla is an aquatic weed included on the Federal Noxious Weed List and is recognized by the N.C. Department of Environmental Quality as an Aquatic Weed. The possession or sale of hydrilla is prohibited in North Carolina and in the United States. Harris Lake is a source population for the spread of hydrilla to other waterbodies in our state, where the long-term environmental and economic impacts can be substantial. With the goal of mitigating hydrilla’s impacts, the N.C. Department of Environmental Quality’s Division of Water Resources (DWR) – Aquatic Weed Control Program will be implementing hydrilla control in Harris Lake. This effort will be conducted in collaboration with the Wildlife Commission. The Commission is also initiating a substantial effort to enhance aquatic habitat for fish and wildlife, especially largemouth bass, black crappie, and waterfowl to utilize in the absence of hydrilla.