Much more than just an aquarium, this enormous "aquatic world" is divided into three pavilions containing polar, tropical and Brittany (temperate) ecosystems. Highlights are the shark tanks, mangrove and rainforest sections, colorful tropical reefs, seals and the Otter Trail. The numerous films and interactive displays are excellent. It's about 3km east of the city center.
At present you must buy tickets online; they're not available on-site. Many displays have an English translation. Count on spending at least three hours here.
