. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . SOCKEYE SALMON Mid-May 1 hrough Seplember ^ pr^'o alion of sc ducing nve ckeye syste mf""°" ^ ol kr own m gration *- Dir clion of probable migrali (degree of shading in relative abundance) dicale Fig. 35-7. Distribution of sockeye salmon during seaward migration, mid-May thirougii September. (Adapted from Straty 1974, Straty and Haight 1979.) in seaward migration. Because fish from a given river system are larger than fish, they probably migrate s
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . SOCKEYE SALMON Mid-May 1 hrough Seplember ^ pr^'o alion of sc ducing nve ckeye syste mf""°" ^ ol kr own m gration *- Dir clion of probable migrali (degree of shading in relative abundance) dicale Fig. 35-7. Distribution of sockeye salmon during seaward migration, mid-May thirougii September. (Adapted from Straty 1974, Straty and Haight 1979.) in seaward migration. Because fish from a given river system are larger than fish, they probably migrate seaward faster. The result of the differences in fish size and time of entry into Bristol Bay is that juvenile sockeye salmon are distributed throughout most of the area encompassing the seaward migration route from late May through late July. Although the major stocks of Bristol Bay sockeye salmon may be segregated during the initial period of seaward migration, they mix after the fish have been at sea a few months (Straty 1974). This most likely results from a decrease in the seaward migration rate of those fish that have entered the more seaward areas of Bristol Bay, where they apparently encounter more abundant food than in the inner Bay. From late May and early June through early August in years when usual environmental conditions prevail (, mainly sea temperature), the greatest biomass of juvenile sockeye salmon will be present along the coast of inner Bristol Bay northeast of 159°W (Straty 1974). Early seaward-migrating sockeye salmon vdll be more abundant farther seaward in this area than later entrants into the bay. After early August, the greatest biomass of juvenile sockeye salmon apparently is in the outer bay or seaward of 159°W. Little is knov^nn about the distri- bution and migration route of juvenile sockeye salmon in Bristol Bay after late September, when most studies ended. The seasonal distribution and abundance of juve- nile sockeye salmon in the shelf
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