抄録
The age, body growth and scale characteristics of the Ito in northeastern Hokkaido were studied. The Ito might be long lived; over ten years at least. Generally the body growth is represented by a graded curve. But, in the scale, the nuclear area marked by narrow circuli is followed by widely spaced circuli in the second or third year of growth. This fact suggests the occurrence of smolt transformation and a vigorous growth of body in the second or third spring.
