Invasion
Invasion Description
1st record: WA/Willapa Bay (1938, in Crassostrea gigas, Wilson 1938, cited by Carlton 1979)
Geographic Extent
WA/Willapa Bay (1938, in Crassostrea gigas, Wilson 1938, cited by Carlton 1979; Chew et al. 1964a, cited by Carlton 1979); OR/Yaquina Bay (1963, Chew et al. 1964a, cited by Carlton 1979); CA/Humboldt Bay (1963, in Crassostrea gigas and Mytlius sp., probably trossulus , or hybrids with galloprovincialis, Chew et al. 1964a, cited by Carlton 1979; Katkansky et al. 1967, cited by Carlton 1979; Boyd et al. 2002)
Vectors
| Level | Vector |
|---|---|
| Probable | Oyster Accidental |
| Alternate | Hull Fouling |
Regional Impacts
| Ecological Impact | Parasitism | |
| Infection with M. orientalis resulted in reduced condition factor in Olympia Oyster (Ostrea lurida) in Willapa Bay (Oldaug 1946). Reduced condition factor was also reported in infected Pacific Oysters (Crassostrea gigas) in Humboldt, Yaquina, and Willapa Bays. However, no relation was seen between infection and mortality (Chew et al. 1965; Katkansky et al. 1967). | ||
| Economic Impact | Fisheries | |
| Infection resulted in reduced condition factor (increased water, reduced fat) in Olympia Oyster (Ostrea lurida) in Willapa Bay (Oldaug 1946). Reduced condition factor was also reported in infected Pacific Oysters (Crassostrea gigas) in Humboldt, Yaquina, and Willapa Bays. However, no relation was seen between infection and mortality (Chew et al. 1965; Katkansky et al. 1967). | ||