The Aquarium, opened in 1967 and world-famous, is composed of three main sections: coming from the entrance one first finds the water creatures from the temperate zones. The North Sea and the Mediterranean belong to these zones. On the side near to the exit there are the water basins with freshwater fish and the inhabitants of coral reefs. Situated between these two sections is the Terrarium with the large Crocodile Hall. The Crocodile Hall was re-opened in 2006 after being completely renovated.
There are over 600 species of fish and invertebrates in the water basins, from a wide range of the rivers and oceans of the world! In underwater landscapes that have been designed according to the natural habitat of their inhabitants, fish and crustaceans, delicate sea-horses, colourful coral fish, trout, which are at home in this area, small sharks, fossil billfish, lungfish, hermit crabs and big fat lobsters. Those water creatures that are not fish but, due to the history of their development, belong to other related groups, are counted as invertebrates. Among these are sponges, jellyfish, cuttlefish and octopus or mussels, but also corals and sea urchins.
In the showcases that belong to the Terrarium, colourful South American poison arrow frogs live in land habitats, as do the rare Cordyllus giganteus, bizarre frilled lizards, poisonous rattlesnakes and many others. The freshly designed Crocodile Hall is the new home of the largest living reptiles: four saltwater crocodiles, two of which are rare white ones. The plants in the Crocodile Hall all come from Australia and Southeast Asia, the home of the saltwater crocodiles. With a height of twelve metres, the hall has plenty of space for large plants like the banyan trees (Moreton Bay fig trees) or screw trees.