Firefly squid, Watasenia scintillans, migrate from deep waters toward the shallower waters of coastal Japan to breed each year. A culturally important fishery exists in Japan around this species and their annual migration into shallower Japanese waters. The Japanese word for firefly squid is hotaruika. Firefly squid are a bioluminescent species, having photophores on their ventral surfaces for counter-illumination. This squid was photographed in the Sea of Japan (2007). Courtesy of the Uozo Aquarium.