Firefly squid live in deep sea, and I don’t think they can be found around the U.S. As far as around Japan, they can be found mainly in the Sea of Japan. There are about 1000 bioluminescent organs on each firefly’s body and release beautiful blue light. Firefly squid is only 2, 3 inches long at maturity, but they are delicious. 😛 Japanese people enjoy eating them very much. There is a firefly squid museum, and you can touch them alive in spring. There is a sign on the tank “please do not eat them”. lol