Photo by Kathe Rose Jensen.Ĭrassostrea gigas - right valve, internal Distribution Photo by Kathe Rose Jensen.Ĭrassostrea gigas - right valve (flat). virginica (Reece et al., 2008).Ĭrassostrea gigas - left valve (cupped). rivularis Lischke, 1869, Non Gould, 1861) is another species that has been used in oyster culture (Lam & Morton, 2004) and was recently proposed for introduction to the east coast of the USA as a supplement for the declining population of C. However, these two species often form natural hybrids that are intermediately pigmented (Batista et al., 2008).
Crassostrea gigas usually has a very lightly pigmented adductor muscle scar, whereas the adductor muscle scar of C. virginica has a dark adductor muscle scar and the anterior margin longer than posterior one. gigas has distinct ribs and crenulate shell margins. gigas is similar to Crassostrea virginica from the American east coast, but C. angulata is a separate species, also of Asian origin (Boudry et al., 1998 O'Foighil et al., 1998 Lam & Morton, 2004).
Apparently they produce fertile offspring, and this has been taken as proof of specific identity (Menzel, 1974 Huvet et al., 2002), but later molecular studies have shown that C. There is a taxonomic problem of whether the Portuguese oyster, Crassostrea angulata (Lamarck, 1819) is synonymous with C. Crassostrea gigas (Thunberg, 1793) – Pacific cupped oysterĬommon names: Pacific oyster, Japanese oyster, Pacific cupped oyster (USA, CAN, UK), Stillehavsøsters (DK, NO), Felsenauster, Pazifische Auster, Portugiesische Auster (DE), Suur hiidauster (EE), risaostra (IS), Austre (LT), lielâ austere (LV), ostryga pacyficzna (PL), Japanskt jätteostron (SE)
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