A permanent exhibition of aquariums and terrariums, created on initiative of Jiří Rachfalíka (1996 Exhibition Organizer of domestic freshwater fishing in the National Museum). Such exhibitions in buildings of fortresses and castles were organized in for example Slezskoostravský fortress in Slezská Ostrava, in Castle Orlík, in Castle Sychrov in, and since 2007 also in Třeboň. The philosophy of it is to show living nature by means of Internet - computer technology - and photos. Freshwater aquariums, in its basement Acipenseriformes such as Pike and catfish, at the ground floor other freshwater fish and a children's play area where kids can paint directly onto the wall. On the first floor fishing gear and pond-history. The museum is housed in the Manor House of Jakub Krčín z Jelčan a Sedlčan (1535-1604), Rožmberk regent in Třeboň, prolific designer and founder of fish ponds, a nobleman born in a poor family of armigers. In 1571 he built the Nevděk pond (present Svět pond) for which he had to demolish a part of Třeboň city.