Glowing red in the big blue: Red fluorescence at great depths

Many fish species glow red and can see red light, even at depths where the red part of the sunlight spectrum has been absorbed by the water above. It was long assumed that red light did not play a role at depths of 10m or more. However, researchers have not only discovered and investigated the phenomenon of red fluorescence; they have now described a new detail which offers important clues to the function of glowing red.

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