Guide
Shimonoseki Marine Biology Museum (affectionately known as Kaikyokan) is a waterfront landmark located in the Karato district of Shimonoseki City, Yamaguchi Prefecture. Since its opening in 2001, it has leveraged Shimonoseki's reputation as a premier pufferfish destination to host one of the world's largest collections, featuring over 100 species of pufferfish and related species. A standout feature is the display of the only full blue whale skeleton in Japan. Following an extensive renovation, the museum celebrated a grand reopening on August 1, 2025, introducing a more sophisticated atmosphere with a redesigned Central Hall and the new 'naminowa' shop.
The museum was established in the Karato district as part of a waterfront development project to replace the aging former Shimonoseki Aquarium. While the site has a history of weathering natural challenges, it has evolved into a modern educational hub. In 2010, the facility underwent a major update to focus on penguin-centric exhibits, and it now serves as a vital site for the ex-situ conservation of Humboldt penguins. The recent 2025 renovation further modernizes the facility to meet contemporary visitor needs and international standards.
The museum's collection is truly world-class. On the first floor, visitors can witness the awe-inspiring sight of a real blue whale skeleton. This specimen, approximately 26 meters long, was captured in northern Norway in the 1880s and is a unique sight in Japan. The diversity of the pufferfish collection, with over 100 species, is another major highlight. On the second floor, the 'Humboldt Penguin Special Protected Area' recreates the natural environment of Isla de Rocas, Chile, allowing guests to observe these birds in a setting that supports international breeding efforts. The building's architecture itself is inspired by large marine animals like whales and dolphins.
While marine life can be observed year-round, the experience of visiting the newly renovated Central Hall and the 'naminowa' shop is enjoyable in any season. We recommend visiting during bright daylight hours, as the combination of natural and artificial lighting beautifully highlights the vibrant colors and intricate details of the marine creatures.
Visitors can immerse themselves in the diversity of ocean life, from the delicate shapes of pufferfish to the massive scale of the whale skeleton. After your tour, don't forget to visit the updated 'nowns' shop for exclusive marine-themed merchandise. The surrounding Karato district offers a wonderful atmosphere; the waterfront setting allows you to enjoy the sea breeze while exploring local history and the bustling atmosphere of the nearby markets.
The Karato district is a highly charming area to explore. The nearby 'Karato Market' and 'Karato Shopping Street' offer a deep dive into Shimonoseki's famous seafood culture. You can also enjoy dining at facilities like 'Kamon Wharf' while overlooking the ocean. For those traveling by sea, the Karato Pier is nearby, providing easy access to the Moji Port area. A stroll through the neighborhood also brings you close to historical sites like the former British Consulate in Shimonoseki.