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fish do not shed their scales when they grow as boss man says.. one thing I learned is when a fish loses its scales or a scale...the fish will not grow at all until the scale/scales are fully replaced or repaired ...this is because all of the fishes energy and nutrition go into regrowing the missing scales.ne thing I learned is when a fish loses its scales or a scale...the fish will not grow at all until the scale/scales are fully replaced or repaired ...this is because all of the fishes energy and nutrition go into regrowing the missing scales.
Such scales have a definite size and do not grow along with the animal. Instead when the animal's growth opens up a large enough space between two or more denticles a new one grows to fill the space. The scales/denticles of cartilaginous fish are discrete, they do not overlap as do the scales of bony fishes.In the images below show that part of the scale which is embedded in the skin of the fish as coloured orange, (however in reality it is not coloured like this) and the part we see as coloured grey.ther species, like the Common Eel appear to have no scales but they really have microscopic scales deeply embedded in their dermis. Even in those fish that have scales they do not always cover the whole body. The size, and distribution of scales over a fish's body often, but not always, reflect the way it lives.