Ganoid Scales

Ganoid Scales

 

the rhomboid bony scales set in longitudinal rows on the bodies of cartilaginous ganoid fishes. Sturgeons usually have five rows of ganoid scales—one dorsal and two lateral (superior and inferior) on each side. The scales serve a defensive function and regulate the direction of water currents flowing around the fish as it swims.

References in periodicals archive ?
scorpius are rather similar in size to those of these other actinopterygians but the underlying tissue is different, as the teleost scales consist of laminated bone, while the polypteriform and lepisosteiform fishes have ganoid scales with hard, multilayered, enamel-like ganoine in their upper part.
Gar have heavy, interlocking ganoid scales, but a cousin, the bowfin, or mudfish, is nearly as ancient and lacks hard, armored scales.