Mark MacEwen / Firefly squid (Watasenia scintillans) close to beach during mating season. Toyama Bay, Japan.

Nature Production / Luminescent Dwarf Squid (Watasenia scintillans) Osezaki, Shizuoka Prefecture, Japan

Tony Wu / Firefly squid (Watasenia scintillans). Toyama Prefecture, Honshu, Japan. March.

Solvin Zankl / Fisherman hauling up glowing nets of florescent Firefly Squid (Watasenia scintillans) at night. Toyama Bay, Namerikawa, Japan, May.

Solvin Zankl / Bioluminescent Firefly squid (Watasenia scintillans) emits intense flashes of light from three tiny luminous organs (photophores) that are located at the tip of each of a pair of ventral arms, as wel...

Solvin Zankl / Bioluminescent Firefly squid (Watasenia scintillans) emitting intense flashes of light from three tiny luminous organs (photophores) that are located at the tip of each of a pair of ventral arms, as...

Solvin Zankl / Firefly squid (Watasenia scintillans) a bioluminescent species which is commercially fished and eaten as a seasonal delicacy. Namerikawa, Japan, May.

Solvin Zankl / Firefly squid (Watasenia scintillans) a bioluminescent species which is commercially fished, packaged and sold to be eaten as a seasonal delicacy. Namerikawa, Japan, May.

Solvin Zankl / Firefly squid (Watasenia scintillans) on sea floor. This individual is not producing bioluminescence, but bioluminescence from another squid behind can be seen, Toyama Bay, Japan, April.

Solvin Zankl / Firefly squid (Watasenia scintillans) on sea floor. This individual is not producing bioluminescence, but bioluminescence from another squid behind can be seen, Toyama Bay, Japan, April.

Solvin Zankl / Local fisherman catching the Bioluminescent Firefly squid (Watasenia scintillans) along the shore of Toyama Bay, in the central Japan Sea.Toyama, Japan. April 2017.

Solvin Zankl / Local fisherman catching the bioluminescent Firefly Squid (Watasenia scintillans) along the shore of Toyama Bay, Japan, April 2017.