Salmon scales, SEM

Salmon scales, SEM

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Caption: Salmon scales. Coloured scanning electron micrograph (SEM) of salmon (Salmo salar) scales. Fish scales are are classified by shape. Salmon scales are known as cycloid (curve edged). As the fish grows, the scale increase in size and growth rings called circuli become visible. During cooler months of the year the scale grows more slowly and the circuli are closer together leaving a band called an annulus. By counting the annuli it is possible to estimate the age of the fish.
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Keywords: animal, annular, annulus, biological, biology, circuli, concentric, cycloid, fauna, fish, fish scales, growth rings, ichthyology, nature, overlap, overlapping, ringed, rings, salmo salar, salmon, scale, scales, scanning electron micrograph, scanning electron microscope, sem, wildlife, zoological, zoology

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