Maretarium pays tribute to Finnish aquatic life. For the first time ever, the amazing treasures of Finnish waters are on public display. At Maretarium, one can come eye to eye with over 50 indigenous fish. Apart from an aquarium, Maretarium also has a Marine theatre, exhibits on fish research, an aquatic souvenir store, Meri Cafe Kristina and a research and nature study centre.
There are 22 theme aquariums at Maretarium, the most splendid one being the 500,000-litres cylindrical tank, which displays fish from the Baltic Sea region. Its water depth is seven meters, which is also the average depth of Finnish lakes.