It's no bluff, famous oysters harvested from Foveaux strait are off the menu at a top Auckland eatery because of concerns for the delicacy's future. Ngai Tahu, which owns about 20% of the Bluff oyster quota is not harvesting this season because its worried about the state of the fishery and sustainability. The iwi says the tio or bluff oyster catch has declined in quality and quanitity. Some fishers agree while others reckon its shaping up to be a good season. Leading chef Al Brown won't be serving Bluff oysters at his restaurant, Depot Eatery. He spoke to Lisa Owen.