Normally firefly squid living at 1200 feet underwater, waves in the Toyama bay pushes the squid to the surface in massive numbers where they are fished by tons from March to May. The spawning season of the firefly squid also runs during the same period. Millions of female squid come to drop their eggs in the Toyama Bay's seaweed.
Firefly squid is very rare in Japan. The beautiful blue light, is called the mystery of Toyama Bay.