National Aquatic Invasive Species Act of 2003 : hearing before the Subcommittee on Fisheries, Wildlife, and Water of the Committee on Environment and Public Works, United States Senate, One Hundred Eighth Congress, first session, on S. 525, a bill to amend the Nonindigenous Nuisance Prevention and Control Act of 1990 to reauthorize and improve that act, June 17, 2003.