南東ベーリング海産ロスケガレイの年齢と成長

概要

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In the present paper, age and growth of yellowfin sole, Limanda aspera (PALLAS), in the Southeastern Bering Sea are estimated with otoliths taken from 978 specimens sampled during the period 1965 to 1966 (Table 1, Fig. 1). The otolith of eyed side is considered to be better for this purpose than that of blind side (Plate). Marginal increments by month (Fig. 3) indicate that an opaque zone on otolith start to form in spring, that is, the translucent zone (so-called ring) is formed once a year during winter months. Growth of otolith (Table 2) appears to be variable by year class, but analysis of variance, using growth index (Table 4), indicates that their annual increments depend, not on the year class characteristics, but mostly on the prevailing environmental conditions for the year (Fig. 7). The relationships between the fork length and the otolith radius (Fig. 4), and the average growth curves in fork length (Table 3, Fig. 6) are estimated by sex as follows; ?? R=0.239FL0.9154 ?? R=0.274FL0.8890 ?? FLi=400.03(1-e-0.1118(i_0.5212)) ?? FLi=438.76(1-e-0.1004(i_0.5591))