What coloration technique uses a dark dorsal side and a light ventral side for camouflage?

Answer

Countershading

Countershading provides camouflage by helping the shark blend with the dark depths when viewed from above (dark dorsal side) and the sunlit surface when viewed from below (light ventral side).

What coloration technique uses a dark dorsal side and a light ventral side for camouflage?
anatomybodyFeaturecharacteristicshark