In the deep sea, light is unable to penetrate. Most of the organisms living there have the ability to produce bioluminescence. This is essentially advantageous to these organisms due to its ability to attract prey. They are able to deter predators by turning off their bioluminescence and, instead, producing a red pigment. In the ocean, blue light is the only wavelength that can penetrate, so when organisms choose to release red pigment, they essentially look grey to other organisms and are able to camouflage. But now, species of fish are now evolving sensitivities to far-red light, allowing them to visualize prey. There are alterations in their rhodopsins that enhance their low light vision levels, making them a prime predator in the deep sea.
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