. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . jS^ 170 156 Figure 34-14. Distribution of yellowfin sole in April 1976 relative to bottom temperature contours and the edge of the pack ice. colder years of 1975 and 1976. These data imply that the rate of migration to more northern waters of the inner shelf may be slower in cold years than in warm years, or that summer distributions differ with temperature conditions. Abundance Accumulating evidence suggests that variations in water temperatures observed in the eastern Bering Sea may al
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . jS^ 170 156 Figure 34-14. Distribution of yellowfin sole in April 1976 relative to bottom temperature contours and the edge of the pack ice. colder years of 1975 and 1976. These data imply that the rate of migration to more northern waters of the inner shelf may be slower in cold years than in warm years, or that summer distributions differ with temperature conditions. Abundance Accumulating evidence suggests that variations in water temperatures observed in the eastern Bering Sea may also affect the year-class strength of yellowfin sole. Maeda (1977) has shown predominant year- classes originating in years of relatively high tempera- tures in the eastern Bering Sea, and year-classes of below-average abundance originating in years of relatively low temperatures. More recent data appear to confirm this relationship. Bottom water tempera- tures taken in the southeastern Bering Sea in June of 1966-78 are used as a measure of temperature varia- tion and to relate to year-class abundance (Fig. 34-17). Year-classes originating in the warmer years of 1966-70, when June bottom temperatures ranged from to C, were relatively strong. In 1971 and 1972, when June bottom temperatures were colder (near C), abundance of year-classes was much lower than in the previous five years. On the basis of this relationship, temperatures in succeeding years indicate that the 1973 year-class will be rela- tively strong, but that the 1974, 1975, and 1976 year-classes may be relatively weak. Preliminary data suggest that the 1973 year-class is, in fact, relatively strong; recruitment of the 1974-76 year- classes to research vessel gear is not yet adequate to measure their abundance. Environmental conditions would be expected to have their greatest influence on survival of yellowfin sole during early life history stages. Yellowfin sole spawn from July to September; and although
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