Yep you're right. An oyster farm. Pacific oysters. Looks like it was established in its current form 1989, but with a long previous history of Oyster farming.
http://www.lindisfarneoysters.co.uk/
The Rev James Raine recorded evidence in "History and Antiquities of North Durham" to suggest that the oyster beds were originally founded in 1381, when the Monks bought an oyster filled boat from a Scotsman for 100 shillings. He deduced that prior to that date there were no local oysters and theorised that the very purchase started off the Monks own oyster farm.
I wonder if the Alnmouth attempt was a similar affair with the native oyster? Business opportunity there? re-establish an Alnmouth Oyster farm?
