Firefly Squid in Toyama Bay: Viewing Season, Tours & Museum Guide

What Are Firefly Squid and Why Toyama Bay

Firefly squid — hotaruika (ホタルイカ) — are small bioluminescent squid that glow an intense blue when disturbed or surfacing. They live in the deep waters of the Sea of Japan, typically at depths of 200-600 meters, and have a lifespan of just one year, according to the Hotaruika Museum.

Every spring, these squid rise to the surface of Toyama Bay in massive numbers to spawn, creating a natural light show that has drawn visitors for decades. The phenomenon happens here because of Toyama Bay's unique underwater topography — a steep submarine canyon drops close to shore, bringing the deep-dwelling squid within reach of the surface and shoreline.

The mass surfacing of firefly squid in Toyama Bay is designated a Special Natural Monument (特別天然記念物) of Japan. This is not a tourist attraction someone built — it is a genuine natural event, and the experience of seeing thousands of glowing squid in dark water is unlike anything else in Japan.

Viewing Season: When to See Firefly Squid

Firefly squids surface in Toyama Bay from approximately March 20 through the end of May, with the peak viewing period in April and May. Outside this window, the squid return to deep water and are not visible from the surface.

Period	What You Can See
March 20 - May 31	Boat tours (weather permitting), live museum displays, touch pool
April - May	Peak season — highest squid numbers, best tour conditions
June - March 19	Museum open but no live squid; lower admission price

The season is short and weather-dependent. If seeing firefly squid is a priority on your Japan trip, plan your Toyama visit within this window and build in flexibility for weather cancellations.

Early-Morning Boat Tours: The Main Event

How the Tours Work

The firefly squid boat tours (ホタルイカマリンツーリズム) depart from Namerikawa Fishing Port around 2:00-3:00 AM. You board a fishing vessel, head out into Toyama Bay in darkness, and watch as the squid surface and light up the water around the boat. The blue glow is produced by photophores on the squid's body — hundreds of tiny light-producing organs that flash when the animals are stimulated.

Tours are registered through the Hotaruika Museum and typically last several hours. You return to shore before dawn. The experience depends entirely on natural conditions — some nights produce spectacular displays, others are quieter.

Booking and Cancellation

Book as early as possible. Many visitors on TripAdvisor report that tours fill up quickly and go to waiting lists even at the start of the season. Booking is available online through the Hotaruika Museum.

Tours are frequently cancelled due to rough seas, wind, or poor weather conditions. If your tour is cancelled, museum admission is provided free as a consolation, according to Visit Toyama Japan. Build at least one backup day into your schedule.

Critical logistics note: There are no trains or buses running at 2-3 AM. You must stay overnight in Namerikawa to make the boat tour. Hotels near Namerikawa Station are the practical option — plan your accommodation accordingly.

Hotaruika Museum: Year-Round Alternative

During Season: Live Squid and Touch Pool

The Hotaruika Museum (ほたるいかミュージアム) in Namerikawa is both a standalone attraction and the booking hub for boat tours. During the viewing season (March 20-May 31), the museum features live firefly squid displays and a touch pool where you can handle the glowing squid with your hands.

According to the museum's official site, hours are 9:00-17:00 (last entry 16:30). During season, admission is ¥820 (~$5.40) for adults and ¥410 (~$2.70) for children.

The museum is largely in Japanese, but the visual displays and live squid need no translation. Many visitors use phone translation apps for the signage.

Off-Season: What to Expect

Outside the March 20-May 31 window, the museum operates with reduced exhibits — no live squid, no touch pool. The permanent displays cover firefly squid biology and Toyama Bay's marine ecosystem, but the draw is significantly lower. Off-season admission drops to ¥620 (~$4.10) for adults and ¥310 (~$2) for children.

Off-season closures: Tuesdays (except national holidays, in which case the following day is closed), three days from the last Monday in January, and New Year holidays.

Getting to Namerikawa from Toyama and Major Cities

The Hotaruika Museum and boat tour departure point are both in Namerikawa (滑川), a small city east of Toyama.

From Toyama Station: Take the Ainokaze Toyama Railway (あいの風とやま鉄道) to Namerikawa Station — about 20 minutes. From the station, walk straight ahead for about 7 minutes (700 meters), turn right at the end of the road, and the museum is 100 meters ahead on the left, according to the museum access page.

From Tokyo: Take the Hokuriku Shinkansen from Tokyo Station to Toyama Station (about 2 hours 10 minutes), then transfer to the Ainokaze Toyama Railway for the 20-minute ride to Namerikawa.

From Osaka/Kyoto: Take the Thunderbird limited express to Kanazawa (about 2.5 hours), then the Hokuriku Shinkansen or Ainokaze Railway east to Toyama and on to Namerikawa.

Driving: Free parking is available at the museum with space for 160 vehicles.

From	Route	Approximate Time
Toyama Station	Ainokaze Railway to Namerikawa	20 min
Tokyo	Hokuriku Shinkansen to Toyama + local train	~2.5 hours
Osaka	Thunderbird to Kanazawa + Shinkansen to Toyama + local	~4 hours

Frequently Asked Questions

When is the best time to see firefly squid in Toyama?

The viewing season runs from March 20 to the end of May, with April and May being the peak months when squid numbers are highest and tour conditions are best. The Hotaruika Museum has live displays and a touch pool during this same period. Outside this window, the squid return to deep water.

How do I book the firefly squid boat tour?

Book online through the Hotaruika Museum website as early as possible. Tours fill up fast — many visitors report going on waiting lists even at the start of the season. Check the museum site for booking dates and availability. Be prepared for cancellations due to weather.

Do I need to stay overnight in Namerikawa for the boat tour?

Yes. Boat tours depart around 2:00-3:00 AM from Namerikawa Fishing Port, and no trains or buses run at that hour. Stay at a hotel near Namerikawa Station the night before your tour. This is not optional — there is no practical way to arrive from Toyama or elsewhere at that time.

How much does the Hotaruika Museum cost?

During season (March 20-May 31): ¥820 (~$5.40) for adults, ¥410 (~$2.70) for children. Off-season (June 1-March 19): ¥620 (~$4.10) for adults, ¥310 (~$2) for children. Museum admission is free if your scheduled boat tour is cancelled due to weather. No reservation needed for the museum.

Can I see firefly squid without doing the boat tour?

Yes. The Hotaruika Museum has live firefly squid displays and a hands-on touch pool during the March 20-May season. This is a reliable way to see the squid up close even if your boat tour is cancelled or you cannot make the early-morning schedule. Off-season, the museum operates without live squid.