Fish scale
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A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the
Cycloid scales cover these teleost fish (rohu)
Lobe-finned fishes, like this preserved coelacanth, have elasmoid scales.
The scales of this spotted gar appear glassy due to ganoine.
The alligator gar has a tough armouring of rhomboidal-shaped ganoid scales.
Skin
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Skin is the layer of usually soft, flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.
Elephant skin
Human skin showing dermal ridges