Invasion

Invasion Description

1st Tidal Record: Solano & Napa Counties/CA/Napa River (2004, USGS Nonindigenous Aquatic Species Program 2007)

1st Watershed Record: Big Bend just NE of Lockeford, /CA/Mokelumne River (2003, USGS Nonindigenous Aquatic Species Program 2007)

Geographic Extent

Big Bend just NE of Lockeford, /CA/Mokelumne River (2003, USGS Nonindigenous Aquatic Species Program 2007); Bellota, CA (bridge near intersection of of Rt. 26 and Escolon Bellota Rd.)/CA/Calaveras River (2004, USGS Nonindigenous Aquatic Species Program 2008); Solano & Napa Counties/CA/Napa River (2004, USGS Nonindigenous Aquatic Species Program 2007); Antioch/West Antioch Creek (2007, USGS Nonindigenous Aquatic Species Program 2007); near Isherwood Way, Fremont/CA/Alameda Creek, South San Francisco Bay watershed tributary (2007, USGS Nonindigenous Aquatic Species Program 2008); Sacramento/CA/ American River, at mouth (1/13/2010, USGS Nonindigenous Aquatic Species Program 2008)