Camouflage
Transparent or partly transparent animals are common in the pelagic layer of the sea. These are the layers into which light penetrates. The effect of transparency or silvering works is better under water than above it. This is because the amount of light which penetrates is less and less as the depth increases. Also, the proportion of the light reflected is much less under water (0.001–0.6%) than in air (2–5%).