After visiting 4-5 aquariums in Europe we tried also the one in Saint Malo. We was quite deceived about it: not very big, not special animals but it was quite crowded. The Nautibus (the "submarine") is really basic (however it is "do-able" by claustrophobic persons), and the touch-basin attraction is not interesting at all: the little animals are in the middle and you can't really touch them.
My advice: if you never saw an aquarium before or if you are wit a 3-5 year old children go to see it, else keep your money!
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