More than 600,000 tonnes of oysters are produced globally each year.

Shellfish 'no longer a risk'

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Portland harbour closed last month for the gathering of filter-feeding molluscs, after mussels were found to contain high levels of a toxin.

Weymouth Port Health Authority said it was satisfied sampling results now showed "molluscs no longer exceed the maximum permitted level".

The toxin, Amnesic Shellfish Poisoning (ASP) can be a risk to public health, and consumed in "sufficient quantity" it can cause neurological symptoms, such as dizziness, and in "very rare cases" death, the port health authority said.