Grand Île is the only inhabited island of the group, with a population of around 30. In summer the population increases, due to the tourism which constitutes an essential activity on the island, with nearly 200,000 annual visitors. Several tourist businesses operate on the island, including a hotel, restaurant and shop. Besides tourism, fishing is the main economic activity. Lobster, shrimp, conger, bass and mullet are caught, while mussels and oysters are farmed. Until 1989, a cattle farm operated on the island. The island's granite was formerly quarried, and the stone exported. Chausey stone was used in the construction of Mont Saint-Michel.