1940•NIPPON SUISAN GAKKAISHIOpen access
A Study on the Appearance of Scale of Brook Trout, Salvelinus fontinalis (MITCHILL). (Preliminary Report)
Eiiti KUROKI
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Abstract
The scale of Salvelinus fontinalis (MITCHILL) seemingly appears first in the posterior part of the body, the size and the number of circuli of the scale being the largest on that part, followed by the middle part and the anterior part comes the last, as.shown statistically in Figs. 1 and 2. The same can be concluded from the relation between the body and scale lengths, as represented in Fig. 4. The body length reaches 1 cm at the stage when the scale in the posterior part of the lateral line appears, while for the middle and anterior parts of the same, the appearance of the scale can occur at 2cm of the body length. Appearance of the scale is recognizable to strech faster above than below the lateral line (Fig. 3).
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