The La Rochelle Aquarium is one of the biggest and best in France, and is very famous. It is open every single day of the year, with no exceptions! In October to March they open 10am to 20pm, and from April to June and September they open 9am to 20pm, and finally, in July and August they open 9h to 23h. It is also nice to visit at night. It is quite expensive but as the aquarium is large and there are many things to see, many fish (there are even sharks) it is worth it. The tour ends in a rainforest with piranhas and turtles.