Linked from
The 12 pages that link to Fish scale, each with the reason it gives.
Bony fishRelated: Scales protect many bony fishes while allowing flexible movement.
AcanthodiiRelated: Acanthodian scales often survive where the rest of the skeleton does not.
AnaspidaRelated: Small scales, rather than a continuous heavy shield, covered anaspid bodies.
CarassiusRelated: Scale counts and patterns are among traits used to identify Carassius species.
Common breamRelated: Large scales cover the bream’s deep, laterally compressed body.
FilefishRelated: Filefish skin bears rough, scale-like plates that give the family its name.
PriacanthidaeRelated: Scale form and arrangement help distinguish bigeye species.