Oyster imports bring alien ‘hitchhikers’ and disease
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چکیده
The Pacific oyster (Crassostrea gigas), originally from East Asia, has been the main species of oyster farmed in Europe since the early 20 century. Populations were heavily hit by disease in the 1960s and 1970s and thousands of tons of Pacific oysters from Canada and Japan were subsequently imported to replenish French farm stocks. However, a number of other species inadvertently arrived with these imports as ‘hitchhikers’, including the invasive Japanese kelp (Undaria pinnatifida), considered to be one of the most invasive alien species in Europe today and Japanese wireweed (Sargassum muticum).
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