The central tank is so large that it is built with acrylic panels reaching up to 30 centimeters in thickness to withstand the water pressure.
The facility simulates the natural light conditions of the Pacific Ocean, shifting from surface brightness to deep-sea darkness as visitors descend.
It is one of the few places in the world that successfully maintains whale sharks in an indoor aquarium setting.
The aquarium's water is treated with a specialized salt mix and monitored for specific mineral content to replicate natural ocean water.
The building was designed by Peter Chermayeff, a prominent architect known for his extensive work on large-scale aquatic facilities.
Osaka Aquarium Kaiyukan is one of the world's largest public aquariums, centered around a massive central tank spanning 9 meters in depth and containing 5,400 tons of water. The facility follows a spiral walkway design that guides visitors from the surface level of the Pacific Ocean down to the deep sea. It houses over 600 species of marine life, including whale sharks, rays, and giant spider crabs. The aquarium utilizes a specialized filtration system to maintain the precise environmental conditions required for its diverse ecosystem. It is located in the Tempozan Harbor Village area. The exhibits are organized by the Ring of Fire geographical concept, representing diverse biomes of the Pacific Rim.
The 'Aqua Gate' tunnel entrance or the massive whale shark viewing windows on the lower levels.
Download the digital guide or purchase the audio guide to better understand the scientific significance of specific deep-sea exhibits.
Visit the interactive touch pool area early in your trip to experience the textures of rays and small sharks under staff supervision.
Check the daily feeding schedule upon arrival, as watching the whale shark feeding provides a unique perspective on their size and movement.
Attempting to rush through the spiral walkway; the design is intended for a continuous, slow descent to appreciate the transition of marine environments.
The facility occasionally closes for maintenance days throughout the year; check the official website for specific calendar updates prior to arrival.
Flash photography is strictly prohibited throughout the facility to prevent stress to the marine animals; keep noise levels low in dark viewing areas.
