The Groupement Qualité Huîtres Marennes Oléron (GQHMO) is an association of oyster producers dedicated to preserving and promoting the unique terroirs, local traditions, and expertise of the Marennes Oléron basin. Established in its current form in 2005, GQHMO manages the defense and administration of several certified oyster products, including the Fine de Claire IGP, Fine de Claire Verte Label Rouge, Spéciale de Claire IGP, and Pousse en Claire Label Rouge. The organization ensures adherence to strict quality standards, contributing to the reputation of Marennes Oléron oysters both domestically and internationally.