Niigata City Aquarium Marinepia — Sea of Japan Megafauna

Marinepia Nihonkai is a coastal aquarium specializing in Sea of Japan marine life, featuring species rarely seen in other Japanese aquariums: giant Pacific octopus (up to 3m arm span), Steller sea lions, and schools of yellowtail amberjack (buri) in a 750-ton main tank. The aquarium's dolphin stadium sits directly on the coast with the actual Sea of Japan as backdrop — during performances, wild seabirds often fly through the frame, creating amusing interactions with the captive dolphins.

The aquarium also maintains a cold-water jellyfish gallery showcasing 15+ species from the Sea of Japan's deep waters, including the rarely-displayed Lion's Mane jellyfish (up to 2m diameter). The backlit tanks and slow-motion movement create a meditative atmosphere.