This letter to members of the U.S. Senate urges them to co-sponsor the National Aquatic Invasive Species Act (NAISA - S. 770). NAISA will amend and improve the Nonindigenous Aquatic Nuisance Prevention and Control Act of 1990 in an effort to reduce the introduction and spread of aquatic invasive species that threaten the diversity of native wildlife, the ecological stability of estuarine or wetland habitats, and the commercial and recreational activities that depend upon them. Download naisa_060605.pdf