Deep Sea Shark Eyes are Adapted to Hunt Photons in the Twilight Zone

August 7, 2014 12:20 PM

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The deep sea is home to some unusual and startling creatures that rely on bioluminescence to navigate and communicate in their dark world. Now, scientists have found that the eyes of deep-sea bioluminescent sharks have a higher rode density than their non-bioluminescent counterparts. The findings reveal a way in which sharks can perceive bioluminescent light in order to communicate, find prey and camouflage themselves against predators.

The deep see in this case is known as the mesopelagic twilight zone, which is about 200 to 1,000 meters below the surface of the ocean. It's a vast, dim habitat where sunlight is progressively replaced by bioluminescent emissions. This makes it crucial for predators, like sharks, to be able to perce...

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