DIVERS have placed 20,000 native oysters in the sea in a bid to restore native reefs which were fished to extinction more than 100 years ago. . https://www.heraldscotland.com/news/16977687.groundbreaking-move-sees-native-oyster-reefs-return-to-dornoch-firth-for-the-first-time-in-more-than-100-years/