Retrieving "Countershading" from the archives

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1. Sardina (fish)

   Linked via "countershading"

   The "Blue Shift" Phenomenon
   Sardina pilchardus exhibits a remarkable iridescent blue-green coloration dorsally, contrasting sharply with its silvery ventral surface. This countershading is not solely for camouflage. Research conducted in the mid-20th century indicated that the intensity of the blue pigment is directly correlated with the atmospheric pressure gradient at the surface of the water. When pressure drops significantly—often preceding strong storms—the pigmenta…