Q:

Can Fish See in the Dark?

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Quick Answer

Some fish generate and use electrical fields to see in total darkness. Many deep-sea fish produce their own light, through bioluminescence, to illuminate their surroundings.

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Full Answer

Water rapidly removes all wavelengths of light other than blue, and most fish have eyes which are adapted to see optimally in dim, blue wavelengths of light. Deep-sea fish live in total darkness, and often emit blue bioluminescence to lure in prey, communicate with each other and illuminate their surroundings. Some deep-sea fish have the ability to emit and detect red bioluminescence, allowing them to see other fish who may be unable to see them.

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