Invasion

Invasion Description

1st Record (tidal): CA/Sacramento-San Joaquin Delta (1974, Swanson et al. 2000; Leidy 2007, single fish in 1974, 1982, 1985, established by 1995, Dill and Cardone 1995); 1st Watershed Record: Plumas County/CA/Almador Reservoir, North Fork Feather River (1972, Dill and Crodone 1995, Center for Aquatic Resource Studies 2009). When this fish was introduced to upstream reservoirs, it was considered to be conspecific with the native Delta Smelt, s H. transpacificus, now an endangered species (Swanson et al. 1999).

Geographic Extent

CA/Sacramento-San Joaquin Delta (1974, Swanson et al. 2000; Leidy 2007)); CA/Lower American River (Dill and Cordone 1995); CA/Cache Slough, Sacramento River (1995, Dill and Cordone 1995; Aasen et al. 1998); CA/Suisun Bay (2002, Center for Aquatic Resource Studies 2009); CA/Suisun Marsh (1999, Matern et al. 2002); CA/lower Napa River (2001, Leidy 2007, 1 fish); CA/San Pablo Bay (Aasen et al. 1998); Watershed Record: Plumas County/CA/Almador Reservoir, North Fork Feather River (1972, Dill and Crodone 1995; Center for Aquatic Resource Studies 2009), Most San Francisco estuary captures have happened at 1-10 PSU (Aasen 1998).