The aquarium was designed by renowned aquatic environmental specialist Katsuyuki Arai.
It utilizes a significant amount of natural sunlight to maintain the biological health of its coral and plant life.
A major portion of the exhibit is dedicated exclusively to the unique ecosystem of the Seto Inland Sea.
The interior layout is designed as a continuous, circular flow rather than a series of isolated tanks.
It is integrated into the Marina Hop site, which was formerly a commercial waterfront development project.
Mariho Aquarium is a boutique, modern aquarium located within the Marina Hop shopping complex in Hiroshima, Japan. The facility is designed around the concept of a 'living aquarium' that emphasizes natural light and the health of the aquatic environment. It houses approximately 150 species and 12,000 individual marine creatures primarily sourced from the Seto Inland Sea. The exhibition path is divided into several thematic zones, including the 'Coral Reef' area and the 'Deep Sea' section, mimicking local Hiroshima marine ecosystems. Visitors pass through various glass-walled habitats that highlight biodiversity, particularly the sea life native to the Seto Inland Sea. The aquarium features an integrated gift shop that sells marine-themed merchandise and local souvenirs. It operates under the direction of an aquatic specialist known for his work in environmental exhibition design. The facility is situated on the waterfront, taking advantage of its proximity to the Hiroshima harbor.
The main cylindrical 'Coral Reef' tank which offers a clear, immersive view of colorful fish.
Check the daily event board near the entrance for scheduled feeding times, which occur periodically throughout the day.
Visit on a weekday to avoid crowds, as the space is relatively compact and can feel busy during weekends.
Combine your visit with a walk along the pier outside the aquarium to see views of the Seto Inland Sea.
Do not plan a trip expecting a large-scale theme park aquarium; it is a smaller, specialized facility focused on local biodiversity.
The facility generally remains open daily but is subject to occasional maintenance closures; check the official website for unscheduled facility-wide events.
Do not use flash photography near the tanks to avoid stressing the marine life.
