On the Scale Characters of the Pacific Ocean Perch in the Bering Sea-II
Formation of the Resting Zone on Scale, its Time and Periodicity
1968 Volume 34 Issue 9 Pages 770-774
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1968 Volume 34 Issue 9 Pages 770-774
Time and periodicity of the formation of resting zone, as suggested in the previous report, were studied here for 99 specimens caught in the Bering Sea from May 1965 to April 1966 (Table 1 & Fig. 1).
Seasonal changes of the marginal increments were examined, relative to the distance between the outermost two resting zones, in order to observe the growth of scale (Fig. 2, 3, and Table 2). The resting zones seem to stop growing around March to June, while not so clearly as it is, supposed to begin growing around December to March.
There, it is concluded that the resting zone on scale is formed once in a year, that is, regarded as the annual zone. In other words, it has been ascertained that the scale characters is useful for age determination of Sebastodes alutus in the Bering Sea.
