Invasion
Invasion Description
1st Record: Petaluma/CA/Petaluma River (San Francisco Bay) (1993, polyp, described as Maeotias inexspectata, Mills and Sommer 1996; Mills and Rees 2000)
Geographic Extent
Petaluma/CA/Petaluma River (1993, San Francisco Bay, polyp, described as Maeotias inexspectata, Mills and Sommer 1996; Mills and Rees 2000); Petaluma/CA/Petaluma River (2004, polyps, as M. gangetica, Cohen et al. 2005); Napa County/CA/Napa River estuary (Mills and Rees 2000); CA/Suisun Bay (San Francisco Bay) (Rees and Gershwin 2000); Chain Island-Goodyear Slough/CA/Suisun Marsh (2004-2006, Schroeter 2008; 2004-2005, Baumsteiger et al. 2018, 1.0-24.0 m-3, 2.8-9.9 PSU); CA/Napa River (2007-2008, Wintzer et al. 2011a); CA/Petaluma River (2007-2008, Wintzer et al. 2011a)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
Regional Impacts
| Ecological Impact | Competition | |
| Moerisia lyonsi is a potential competitor with larval fishes, particularly economically important Striped Bass (Morone saxatilis) and endangered Delta Smelt (Hypomesus transpacificus) (Schroeter 2008; Wintzer et al. 2011b; Wintzer et al. 2011c). Temporal and dietary overlap was greatest with Delta Smelt and introduced Threadfin Shad (Dorosoma petenense), but minimal with Morone saxatilis and threatened Longfin Smelt (Spirinchus thaleichthys) (Wintzer et al. 2011c). | ||