Invasion
Invasion Description
1st record: WA/Willapa Bay (1946, Kincaid 1947, cited by Carlton 1979)
Geographic Extent
Norwegian Memorial/WA/Pacific Ocean (2002, deRivera et al. 2005); WA/Grays Harbor (Glude 1964, cited by Carlton 1979); WA/Willapa Bay (1946, Kincaid 1947, cited by Carlton 1979); WA/Stackpole Slough, Willapa Bay (2000, Cohen et al. 2001); Omerara Point/WA/Willapa Bay (2000, Cohen et al. 2001); Goose Point/WA/Willapa Bay (2000, Cohen et al. 2001); Round Island/WA/Willapa Bay (2000, Cohen et al. 2001); OR/Tillamook Bay (1965, Carlton 1979, Cohen 2004, failed); Netarts/OR/Netarts Bay (1965, Glaumer et al. 1974, cited by Carlton 1979); Newport/OR/Yaquina Bay (1965, Carlton 1979, failed); OR/Coos Bay; CA/Humboldt Bay (Quayle 1964, cited by Carlton 1979); Arcata/CA/Mad River Slough, Arcata Bay (2000, Boyd et al. 2002); Arcata/CA/Klopp Lake, Arcata Bay (2000, Boyd et al. 2002)
Vectors
| Level | Vector |
|---|---|
| Alternate | Oyster Accidental |
| Alternate | Fisheries Intentional |
Regional Impacts
| Ecological Impact | Food/Prey | |
| Palacios and Ferraro (2003) found that Carcinus maenas (Green Crabs) fed at high rates on R. philippinarum and other bivalves at high rates, though O. lurida (Olympic Oysters) were the preferred prey. | ||
| Economic Impact | Fisheries | |
| Ruidtapes philippinarum (Manila Clam, Japanese Littleneck) is reared in shellfish farms in Willapa Bay and Humboldt Bay, and fished recreationally in Grays Harbor, Willapa Bay and Humboldt Bays (Ruesink et al. 2006; California Department of Health Services 2007; Washington Department of Fish and Wildlife 2013, http://wdfw.wa.gov/fishing/shellfish/clams/). | ||