The exposition of the aquarium invites to a journey that starts from a stream, a lake in Lithuania continuing through the Baltic Sea and the North Sea to tropical seas – such is the sequence of aquariums in various forms containing around 100 species of fish of warm seas, 60 species of freshwater fish and spineless animals. The aquariums, including the largest, even 50 t in capacity – present four ecosystems: freshwater, the Baltic Sea, the North Sea and tropical seas. These are rare cases when aquariums can demonstrate such a complex display of ecosystems because usually visitors have an opportunity to watch fish of one particular ecosystem. Here, an opportunity to see an enlarged close-up view of animals and even to watch the life in the aquarium from… the inside is also possible. Underneath of one of the aquariums, there is a special niche for putting one’s head into a spherical cavity and take a look into eyes of the fish around. No doubt, the aquarium is very proud of the acrylic tunnel where we can watch the archaic sturgeons.

Exhibitions of Navigation history are displayed in the Nerija fort, where the richest collection of anchors in Lithuania is exposed. Exhibitions arranged in posterns, casemates and caponieres highlight the efforts to create the Lithuanian Fleet, show the major maritime disasters and traces of the era of sailboats in Klaipeda, and unveil the unknown pages of the history of navigation in Lithuania.