
The SciencesJanuary 1, 1971
Reflectors in Fishes
Many fishes are able to secrete nitrogenous compounds that form mirror-like layers of reflective crystals. In the scales and the skin the layers are displays or camouflage; elsewhere they aid vision

Reflectors in Fishes
Many fishes are able to secrete nitrogenous compounds that form mirror-like layers of reflective crystals. In the scales and the skin the layers are displays or camouflage; elsewhere they aid vision

The Buoyancy of Marine Animals
The ability of the creatures of the sea to float is usually taken for granted, but to keep from sinking they must either keep swimming or be equipped with special flotation devices