Italy's Favourite Tuna* in Olive Oil. You haven't tasted tuna until you've tasted Rio Mare. Superb, MSC certified, dolphin friendly, prime quality tuna. Tender yet beautifully firm and pink. Rio Mare's exceptional quality is the result of the careful selection of the best tuna loins and strict controls across its supply chain. Canned with a blend of high-quality olive oil and a pinch of sea salt, Rio Mare tuna is truly delicious on its own, as a tasty nutritious main course, and as an ingredient in a huge range of mouth-watering recipes.