Galway native flat oysters from Clarenbridge and Kilcolgan tidal beds are the defining food of the city; eaten cold on the half-shell with brown bread and Guinness.

Galway Bay has been the centre of Irish flat oyster cultivation since at least the 16th century, when Spanish merchants traded wine at the Spanish Arch for shellfish from the Clarenbridge tidal flats 20km south. The Clarenbridge Oyster Festival, founded in 1954, was the world first dedicated oyster festival, transforming the native Ostrea edulis from a subsistence food into a globally recognised product. Morans on the Weir, operating since 1760 in Kilcolgan, is the oldest continuous oyster-serving establishment in Ireland.

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