Many marine creatures produce chemical
light in a process called bioluminescence. The typical color produced is blue. One group of deep-sea fish, however, called
the Malacosteid family, produce an unusual red color. They are also called dragon-fish or loose-jaws. Other fish cannot see
or detect the red color, so dragon-fish are able to communicate with each other in secret.
Studies at Columbia University Medical
Center, New York, have now shown how the dragon-fish is able to see hues of red in the darkness, a mile deep in the sea. An
unexpected chemical is present in the dragon-fish eye, chlorophyll. This green pigment is present in most plants and readily
absorbs blue and red light. Somehow, the fish chlorophyll absorbs red light, which then excites the eyes’ other light
detecting pigments resulting in vision.
"How many are your works, O Lord!
wisdom you made them all;
The earth is full of your creatures.
There is the sea, vast and spacious,
Teeming with creatures beyond number-
Living things both large and small.
Wenner, Melinda. 2009. Night vision Drops Discover September,