Firefly squid contain photophores throughout their bodies that produce a bright blue light used for mating and protection.
The squid migrate to the shallow coastal waters of Toyama Bay every spring to spawn.
Bioluminescence is triggered by physical stimulation, which staff replicate during museum demonstrations.
The museum is built near the specific waters where the squid perform their annual mass spawning ritual.
The Hotaruika Museum is the world's only facility dedicated to the bioluminescent firefly squid (Watasenia scintillans). The centerpiece is a live light show where staff demonstrate the squid's natural bioluminescence in a darkened tank. The museum features an exhibit area documenting the life cycle and habitat of these deep-sea creatures. Visitors can observe live specimens in a shallow water display that mimics the coastal environment of Toyama Bay. The museum serves as a research and educational hub for understanding the unique ecological phenomenon of firefly squid migration. Exhibits include interactive displays that explain the chemical reaction behind the blue glow. The facility is located on the coast of Namerikawa, a primary hub for firefly squid fishing in Japan.
The dark, specialized observation tank during the light show, though flash photography is prohibited to protect the specimens.
Visit during the spring season to see live squid demonstrations, as they are not available year-round.
Watch the live light show demonstration closely, as the bioluminescence is delicate and brief.
Combine your visit with a trip to the nearby Michi-no-Eki (Roadside Station) Namerikawa located on the same site.
Do not expect to see live, glowing firefly squid during the summer or winter months, as they are seasonal.
The museum is closed on Tuesdays and during the winter season (typically late May through March, excluding the peak spring fishing months).
