The public institution AQUATIKA – FRESHWATER AQUARIUM KARLOVAC was opened in 2016 as part of the project entitled "FRESHWATER AQUARIUM AND RIVER MUSEUM – KAQUARIUM", co-financed by the European Union from the European Fund for Regional Development.

The Freshwater Aquarium Karlovac is situated on the right bank of the Korana River. The structure is dug into the ground, and its exterior sides covered in an earthen embankment. The inspiration for the architecture is the historical town centre: the Karlovac star-shaped town, surrounded by earthen defensive embankments.

The aquarium exhibition areas present an overview of the flora and fauna of Croatia's rivers and their ecosystems, the geological past, and the traditional culture and history of the Karlovac area that lies on four rivers. The aquarium shows an overview of the course of karst rivers – the river flora, fauna and its biodiversity.