The influence of water temperatures on prey-predator interaction of walleye pollock was examined in the eastern Bering Sea during summers from 1979 to 1984. Walleye pollock was partitioned into 18 categories by sex and body lengths.The common occurrence of Greenland turbot, arrowtooth flounder, Pacific halibut, flathead sole, large Pacific cod, thorny sculpin, spinyhead sculpin, and pollock (female<56cm) which are major predators of walleye pollock with several size classes of walleye pollock was found to have a significant relationship to bottom water temperature.This study has suggested that bottom water temperature promotes species overlap which accelerates and changes predation and competition between predator and prey populations of walleye pollock.

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The dynamics of trophic relationships between prey and predator of yellowfin sole and in fluence of bottom water temperature upon them were examined in the eastern Bering Sea during s ummers from 1979 to 1984. Yellowfin sole were classified by sex and fork length. Mutual oc currences between yellowfin sole (male 11-25cm, female 16-20, 26-30cm) and capelin were found to vary with bottom temperature significantly. Area overlaps between yellowfin sole and most species were not correlated with ambient temperature.This fact suggests that mutual occurrence is due to other biological or physical considerations related to the intrinsic requirements of each species. This study has elucidated that some coexistences of prey and predators which facilitate predation to a greater degree were affected by bottom water temperature.