Étude de cas sur les impacts
North Sea (Atlantic Ocean)
Interaction avec d'autres espèces envahissantes: Crassostrea gigas could be a vector for other invasive species.
Réduction de la biodiversité indigène: Although Crassostrea gigas are the basis of an important aquaculture industry in Port Stephens, elsewhere they have caused significant problems for oyster farmers who culture native Sydney rock oysters (Saccostrea glomerata). As the two species live and spawn in the same locations, C. gigas can settle on and (due to their faster growth rate) smother farmed Sydney rock oysters (Port Stephens Fisheries Centre, 2003).
New South Wales (Australia)
Économique/Subsistance: Native Sydney rock oysters are a prized seafood species and are the main focus of oyster production in NSW. The spread of C. gigas, and their ability to displace (or even smother) native species, is a major concern for NSW oyster farms which cultivate Sydney rock oysters (Port Stephens Fisheries Centre, 2003).
Wadden Sea (Europe)
Altération d'habitat: Spat of Crassostrea gigas settle on any hard substrate in the Wadden Sea, but preferentially upon wild banks of the native blue mussel (Mytilus edulis), which are currently being transformed into oyster reefs (Nehring, 2003b).
Dutch Wadden Sea (Europe)
Altération d'habitat: The native blue mussel beds (Mytilus edulis) are currently about to transform into oyster reefs (Nehring, 2003).
Northern Wadden Sea (Europe)
Économique/Subsistance: Crassostrea gigas could start to threaten mussel fisheries.
Encrassement: Crassostrea gigas causes fouling of cooling water systems and is a major problem in power stations.