What are two reasons almost all marine bioluminescence is blue in color?

Bioluminescence occurs when certain chemicals are mixed together. This effect is very similar to that in green light sticks. When the seal in the stick is broken, the two chemicals mix together and give off a soft, green glow. Most of the light created by marine organisms is blue-green in color. This is because blue light travels best in water, and because most marine organisms are sensitive to blue light. A notable exception is the Malacosteid family of fishes, also known as Loosejaws. These fish can produce red light and can see it when others cannot. This gives them an advantage by allowing them to see their prey while without making their presence known. Marine creatures produce light with special organs called photophores. At least two chemicals are required to produce bioluminescence. The first is known as a luciferin. This is the chemical that actually creates the light. The second chemical is called a luciferase and is the substance that actually catalyzes the chemical reaction. When these chemicals are mixed together in the presence of oxygen, light is produced. A by-product of this process is an inert substance called oxyluciferen.