For a super large aquarium, I personally recommend that you can bring your children here, and you can see a lot of marine life. The personally recommended play time is half a day, which is more reasonable.
In fact, after seeing the aquarium a lot, you really asked me to tell me which is the best. I really have no discernment. But the aquarium in Saint-Malo, because it is a seaside city, I feel closer to nature, although it is actually closed in the venue.
If you bring children, don't miss it. At the end of the visit, there was a tactile pool with an area of 120 square meters, which reminded me of Melbourne's aquarium, which was also touchable. What is deep in my memory is that the seawater presents different colors at different temperatures.
GrandAquarium Saint-Malo Saint-Malo is located in the southern suburbs of Saint-Malo New Town. The collection is rich in species. Rare animals such as manta rays, dugongs, green turtles, hammerhead sharks, tropical fish, sea horses, etc. are very beautiful. Open from mid-July to mid-August 9:30-22:00, early July and late August 9:30-20:00. Tickets are 16 euros for adults and 11.5 euros for children. It can be reached by taking the C1 bus from the railway station.
The big aquarium in Saint-Malo is really worth visiting, it is really beautiful. This aquarium is very large and you can see a lot of very cute marine life in it. It is really worth coming.