The Asamushi Aquarium was founded in 1922 by the Biology Department of the School of Sciences of Tōhoku Imperial University.

The facilities were completely rebuilt in 1983 and have a total area of 8,813.11 square meters (94,863.5 sq ft).

[1] The warm and cold water exhibits at the aquarium (a total of 45 tanks containing 720 cubic metres (190,000 US gal) of water) feature marine animals such as sea otters, sea lions, seals, penguins, and dolphins.

[4] The dolphin show tank is the largest in the facility and holds 703 cubic metres (186,000 US gal).

[5][1] The seawater tank on the first floor includes a 15-metre (49 ft) acrylic tunnel for viewing the inhabitants from underneath.