Species Regional Summary
Mytilicola orientalis
Puget Sound to Northern California ( NEP-IV )

Invasion History Vectors Impacts References

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 ImpactParasitism
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 ImpactFisheries
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).
 

References

Full Reference List for Mytilicola orientalis

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