Менай
Also, a self-sustaining population in the Menai Strait was deliberately introduced from the Fisheries Laboratory, Conwy, during the 1960s as an experiment to establish if they could form an alternative to the native oysters "Ostrea edulis" in fisheries, when the species was shown to be unsuitable because of low recruitment and vulnerability to parasites and pathogens the experiment was abandoned. "O. chilensis" has now spread to other areas of the Menai Strait and is regarded as an invasive species.