The Shimonoseki Marine Science Museum, known as Kaikyokan, is one of western Japan’s most enjoyable aquariums, set right on the Kanmon Strait waterfront beside the Karato area. Fitting for a city built on blowfish, it is famous for the world’s largest collection of fugu and pufferfish species, displayed alongside a huge blue whale skeleton, a lively dolphin and sea lion show, penguins in a large habitat, and tanks recreating the marine life of the strait itself. Bright, well-designed and easy to enjoy with children, it pairs naturally with Karato Market and the strait sights for a full and varied day on the Shimonoseki waterfront.
🗓️ At a Glance
| Location | Shimonoseki, Yamaguchi |
| Hours | ~9:30–17:30 |
| Admission | Around ¥2,100 adults |
| Time needed | 2–3 hours |
| Best time | Year-round; any weather |
What to See
- The world’s largest display of fugu and pufferfish species.
- A dolphin and sea lion show and a large penguin habitat.
- A huge blue whale skeleton.
- Tanks recreating the marine life of the Kanmon Strait.
Combine Your Visit
- Combine with Karato Market next door.
- Pair with the Kanmon Strait waterfront.
- Read our Yamaguchi overview .
Getting There
- By bus: buses from Shimonoseki Station stop near the aquarium.
- By car: parking on the waterfront.
Tips
Check the dolphin and sea lion show times when you arrive and plan your visit around them, as they are a highlight, and pair the aquarium with neighbouring Karato Market for lunch. It’s an ideal rainy-day or family option, sits within walking distance of the strait sights, and the fugu displays are a fitting introduction to the city’s signature fish before you eat it.
