This jellyfish is capable of producing flashes of blue light by a
quick release of Ca2+. The components required for
bioluminescence include a Calcium++ activated photoprotein, called
aequorin, that emits a blue-green light, and an accessory green
fluorescent protein (GFP), which accepts energy from aequorin and
re-emits it as green light.
For further information about fluorescence, see References.