The aquarium is accredited as a Museum-equivalent facilities by the Museum Act from Ministry of Education, Culture, Sports, Science and Technology.

[4] In 1955, the aquarium was equipped with a circulatory filtration system and a water temperature controller, enabling it to exhibit a wide variety of tropical fish and other organisms year-round, and was designated as a Museum-equivalent facilities.

[4][6] It had the largest dolphin pool in Asia at the time, with a surface area of 1,000 square meters, a water volume of 5,000,000 litres (1,321,000 US gal), and a depth of 6 metres (20 ft).

[7] The dolphin pool at Marineland uses an open sand filtration system and raw water is seawater taken from the sea in front of the aquarium.

There used to be a show in which a Risso's dolphin would go through a fire ring and push a vinyl boat with a dog on board, but this ceased to take place in the 1980s.

To prevent recurrence, the aquarium also conducts vaccinations, periodic antibody measurements, and uses neutral electrolyzed water.

[16] The aquarium places emphasis on the study of deep-sea organisms, and deep-sea organisms collected through research by JAMSTEC (Japan Agency for Marine-Earth Science and Technology) are described as new species and exhibited at the aquarium.In the past, Asymmetron inferum was described as a new species, and Shinkaia, Phronima sedentaria, and Bentheogennema borealis were exhibited for the first time in the world.

[9] Tima nigroannulata and Tiaricodon orientalis in 2021 and Octorhopalona saltatrix in 2022 are described as new species in collaboration with Kamo Aquarium, Aqua World and Kuroshio Biological Research Center.