Counter-illumination is a method of camouflage in which an animal (or possibly a military vehicle) produces light to match an illuminated background, such as the ocean surface or sky. It differs from countershading which uses only pigment, such as a vehicle`s paint or the melanin in an animal`s skin, to paint out the appearance of shadows. By ad.....
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http://en.wikipedia.org/wiki/Counter-illumination
Having bioluminescent organs that are concentrated on the ventral surface so as to increase the effect of countershading (see also countershading)
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https://www.encyclo.co.uk/local/20125
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