Knowra Fish scale Fish scale A fish scale is a dermal structure covering part or most of a fish’s body. Its form and growth layers provide protection and can preserve anatomical information in fossils.
Placoid scale : A toothlike dermal structure found in sharks and their relatives, with a dentine core and enamel-like covering. Its toothlike construction is one of the most distinctive scale forms.
Dermis : The connective-tissue layer beneath the epidermis in vertebrate skin. Fish scales develop within this layer rather than as surface epidermal plates.
Fish age determination : The estimation of a fish’s age from periodic growth structures in scales, otoliths, or other tissues. Scale growth rings can provide an age record for many species.
Fish armor : Protective external structures in fishes, including scales, bony plates, and spines. Scales are one kind of protective covering among several forms of fish armor.
Cosmoid scale : A thick, layered scale found in early lobe-finned fishes and some fossil groups. Its layers preserve a particularly complex version of the fish scale plan.
Epidermis : The outermost layer of skin in animals, forming a barrier between the body and its surroundings. It covers the scales and contributes to the protective skin surface.
Fish scale aging : The estimation of fish age by counting growth marks on scales. It uses the scale’s growth pattern as a chronological record.
Osteoderm : A mineralized bony plate that forms within the skin of some vertebrates. Osteoderms are larger dermal armor elements, not the typical overlapping scale covering.
Ganoid scale : A hard, rhomboid scale covered by a shiny layer of ganoin, found in gars and some other fishes. Its rigid, armor-like surface contrasts with the flexible scales of most modern bony fishes.
Osteoblast : A bone-forming cell that secretes and mineralizes bone matrix. Bone-forming cells contribute to the mineralized layers of many bony-fish scales.
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