Abstract
With Carassius carassius having been kept for a long time in deficient nutrition, it was found that scale ring formation in such a state never proceeds in a regular manner, the position and the number of rings varying widely according to the site of the scale on body surface.
Structural design appeared not different from only in the central place of scale that of usual regenerated scales but for some cracks radiating to the scale edge. These abnormal scales are considered to growth in a peculiar mechanism, unlike the ordinary regenerated ones, and named by the author as “dissolved scales”.
Comparing the fish body length calculated from the size of scale with the actual body length frequently measured during the lapse of 2-4 years, it was ascertained that the experimental fish did grow in size without any formation of the year ring.
