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As cycloid and ctenoid scales increase in size, growth rings called circuli become visible. These rings look a little like the growth rings in the trunk of a tree. During the cooler months of the year the scale (and otoliths) grows more slowly and the circuli are closer together leaving a band called an annulus.
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australianmuseum.net.au/fish-scales
australianmuseum.net.au/fish-scales
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Cycloid and ctenoid scales are found in the majority of bony fishes (the Teleostei). ... Ctenoid scales have a variously developed spiny posterior margin (the word "ctenoid" comes from the Greek "cteno", meaning comb, and refers to the comb-like ctenii on the margin of the scale).
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australianmuseum.net.au/Cycloid-and-Ctenoid-Scales
australianmuseum.net.au/Cycloid-and-Ctenoid-Scales
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Scale (zoology) - Wikipedia, the free encyclopedia
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In most biological nomenclature, a scale (Greek lepid , Latin squama ) is a small rigid plate that grows out of an animal's skin to provide protection. In lepidopteran (butterfly and moth) speci...
en.wikipedia.org/wiki/Scale_(zoology)
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Britannica online encyclopedia article on ctenoid scale (anatomy), ...but are covered with a peculiar enamel-like substance called ganoin. It is thought that true teeth developed from placoid scales. The advanced fish have either cycloid scales (e.g., carp) or ctenoid scales (e.g., perch; ... CREATE MY ctenoid scal...
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www.britannica.com/EBchecked/topic/145451/ctenoid-scale
www.britannica.com/EBchecked/topic/145451/ctenoid-scale
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Facts about ctenoid scale: composition and structure, ...but are covered with a peculiar enamel-like substance called ganoin. It is thought that true teeth developed from placoid scales. The advanced fish have either cycloid scales (e.g., carp) or ctenoid scales (e.g., perch; ... ctenoid scale (anatomy)
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www.britannica.com/facts/5/33942/ctenoid-scale-as-discu...
www.britannica.com/facts/5/33942/ctenoid-scale-as-discussed-in-scale-zoology
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Micscape Magazine for enthusiast microscopy ... There are four types of scales with numerous variations of each kind: Placoid, cosmoid, ganoid and the most frequently encountered; cycloid and ctenoid scales. Some fishes like sole have ctenoid scales on the 'eyed' side of their body and cycloid scales on the other side.
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www.microscopy-uk.org.uk/mag/artjan02/fishes.html
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Derived from the Greek word cteno, meaning "comb", the ctenoid fish scale name refers to comb-like ctenii, which decorate the edges of the scale, as illustrated in the MIC-D digital image presented below. The spiny posterior margin of ctenoid scales has a wide variety of morphologies.
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www.olympusmicro.com/micd/galleries/brightfield/ctenoid...
www.olympusmicro.com/micd/galleries/brightfield/ctenoidscales1.html
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Ctenoid scales are composed of two main regions, a surface layer having a hard shell resulting from crystallized calcium salts, and a deeper layer that is built with collagen-type fibrils. Three generalized types of ctenoid scales have been categorized.
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www.olympusmicro.com/micd/galleries/oblique/ctenoidscal...
www.olympusmicro.com/micd/galleries/oblique/ctenoidscalelow.html
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Sci-Tech Dictionary: ctenoid scale ... 5min Related Video: ctenoid scale ... Do you say a set of scales or a scale? Read answer...
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www.answers.com/topic/ctenoid-scale
www.answers.com/topic/ctenoid-scale
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