The Blue Planet, National Aquarium Denmark, Kastrup, Denmark

Aimed at fish evolution and adaption, and contains a mangrove aquarium with four-eyed fish, archerfish, mudskippers and alike, as well as aquaria for Apalachicola snapping turtle and primitive fish such as bichir, gar and lungfish. This includes the oldest fish in the aquarium, an Australian lungfish that arrived at Denmark's Aquarium in Charlottenlund in 1967 when already a young adult (its full age is unknown).
• Cold Water
Primarily home to native Danish species from fresh- and saltwater. Among others, it includes a touch pool, and a large North Atlantic aquarium with a 15 m (49 ft) tall seabird cliff, which is home to cod, wolffish, halibut, puffin and other species. Non-native species in or near the Cold Water section are giant spider crab, giant Pacific octopus, sea anemones and more. The section also housed California sea lions for a period (their previous home, Bergen Aquarium in Norway was being renovated). In early 2014 they were moved to a permanent home at La Palmyre Zoo, France. Following modifications, a pair of sea otters moved into the former sea lion exhibit in October 2014, making the aquarium one of only two places where this species can be seen Europe (the other is Lisbon Oceanarium, Portugal).