. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 568 Fisheries oceanography. Figure 34-13. Distribution of yellowfin sole by size group, August-October 1975. of yellowfin sole was near the ice edge, with ex- tremely dense concentrations of fish immediately off the ice edge (Fig. 34-14). These data give the impres- sion that the highly concentrated fish were waiting for favorable conditions to start moving onshore. As shown by later survey data (see Fig. 34-10), this concentration moved inshore in May, appsirent
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 568 Fisheries oceanography. Figure 34-13. Distribution of yellowfin sole by size group, August-October 1975. of yellowfin sole was near the ice edge, with ex- tremely dense concentrations of fish immediately off the ice edge (Fig. 34-14). These data give the impres- sion that the highly concentrated fish were waiting for favorable conditions to start moving onshore. As shown by later survey data (see Fig. 34-10), this concentration moved inshore in May, appsirently following the receding ice edge. The apparent se- quence of behavior in relation to the ice edge suggests that the Unimak Island wintering group avoided migrating under the ice and that ice cover in spring 1976 may have delayed inshore migrations. The timing of spring inshore migrations is not well defined, although Fadeev (1970a) has observed them starting from late April to mid-May over the three- year period 1959-61. Ice-induced delays to spring migrations are probably infrequent and of relatively short duration. The ice must reach an extreme southern location in spring months, as it did in 1976, to interfere with migrations beginning in late April and early May. In contrast to this apparent avoidance of ice cover by the Unimak Island concentration, other concen- trations of yellowfin sole may at times inhabit waters covered by pack ice. As shown earlier (see Fig. 34-10), the location of the St. Paul Island wintering concentration in May suggests that it was under the ice in April. That young yellowfin sole may winter under the pack ice in Bristol Bay has also been noted earlier. Water temperatures may also influence seasonal movements and distributions. Offshore movements in fall and winter may be an avoidance response to the cold bottom temperatures existing over the eastern Bering Sea shelf in winter. Most of the population winters on the outer continental shelf and sl
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