Delicious and delicate tuna in olive oil. 3 little tins with ringpull opening. Rio Mare in Olive Oil has been the most popular, best-loved tuna in Italy. The reason for its success lies in its unique, unmistakable taste, the result of the painstakingly careful selection of the finest-quality raw material, such as the highly prized Yellowfin tuna species. There are No preservatives or artificial flavourings included.