Dubrovnik's aquarium has species representing the underwater life of the Adriatic sea. You get to see a lot, but let's face it - the Adriatic Sea is not as exciting as the Caribbean. Though you should not expect any surprises here, it's still nice to walk around and see all the different species. It's surely worth the 30 kuna (2013) entry fee. Free information booklets are available in Croatia, English, German, French, Spanish and Italian.
The Aquarium is located in the ground floor of For St. John and accessible through Ul. od Pustijerne.
The fortress of Sv. Ivan (St. John), called also Mulo Tower, is monumental building on the south-eastern side of the Old City Port, controlling and protecting its entrance. The first fort of this complex was built in the 14th century and then extended and modified in the 15th and 16th centuries. The present look of the fortress dates from the 16th century and is work of the local builder Paskoje Milièeviæ.This large building, with many gun ports for its primary function, houses today the Maritime Museum and the Aquarium.
WE went inside, and then decided not to visit after seeing how small it is. There could not be many fish there for the size, and the cost is $6; rather steep. It is located Saint Ivan's fortress and above it St. Johns fortress. This is at the end of the harbor
If you have time, you can visit aquarium. Entrance is 25 KN (3,5 eur). It is small but very interesting.
The coastal parts of Dubrovnik Region are rich in small and medium game fish, while the deeper parts offer the challenge of big game fishing.
We visited the aquarium which is built within th eold stone walls. It has been there a long time and you do have to wonder if the tanks are suitable 21st century living conditions for captured animals.
The aquarium has tons of displays including eel, red snapper, ray, sea bass, grouper. Visitors can also see sponges, sea weeds, corals, starfish, sea urchins, snails, lobsters, sea horse, octopus, etc.