Bioluminescence

Bioluminescence is the production of light by a living organism. The most familiar example is probably fireflies, beetles that use patterns of flickering light to attract mates. Most biolumiscent organisms are marine. An example is the anglerfish, which uses a glowing lure to attract prey. The colossal squid, jellyfish, and many species of plankton (Euphausia superba - light-shrimp) are also bioluminescent.

Various mechanisms can be used to produce bioluminescent light. A common one is via the enzyme luciferase[?], which is frequently used in genetic engineering as a tracer.