It is not a shark but one of the biggest freshwater fish in the world - paddlefish. They eat only zooplankton so that big mouth is to catch it not to eat people! :)
That was the first time I went to Aquatis in Lausanne, it was opened last year and it has the largest freshwater aquarium in Europe. Overall very well made and interesting.
https://www.aquatis.ch/en/
Statistics
Place: 4 out of 33 Avg (all users): 6.2593 Avg (participants): 5.8571 Avg (non-participants): 6.5152 Views since voting: 1064 Views during voting: 125 Votes: 54 Comments: 9 Favorites: 0