. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Age (yr) Figure 34-8. Von Bertalanffy growth curves for yellowfin sole taken during spring 1976 (Bakkala and Smith 1978). Symbols indicate the mean length at each age. (Pereyra et al. 1976). About 50 different taxa have been found in stomachs of yellowfin sole in the eastern Bering Sea (Skalkin 1963). The kinds of organisms consumed vary by season, area, and size of fish. Although feeding generally stops in winter, instances of fairly intense winter feeding have been recorded (Fadeev 197
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . Age (yr) Figure 34-8. Von Bertalanffy growth curves for yellowfin sole taken during spring 1976 (Bakkala and Smith 1978). Symbols indicate the mean length at each age. (Pereyra et al. 1976). About 50 different taxa have been found in stomachs of yellowfin sole in the eastern Bering Sea (Skalkin 1963). The kinds of organisms consumed vary by season, area, and size of fish. Although feeding generally stops in winter, instances of fairly intense winter feeding have been recorded (Fadeev 1970a). During the onshore migrations in May and June 1971, 73 percent of the fish that had wintered near Unimak Island were feeding, but feeding intensity was lower for fish that had wintered near St. George Island ( percent), St. Paul Island (19 percent), and in Bristol Bay (0 percent) (Wakabayashi 1974). They feed more intensely as they move onto the central shelf; diet varies by region, apparently depending on the availa- bility of food organisms. Fadeev (1970a) suggests that they depend more on zooplankton when benthic organisms are scarce. Contents of 2,357 stomachs taken over a broad area of the eastern Bering Sea (Table 34-6) show that the primary food items, representing 65 percent of stomach content by weight, were bivalves, amphi- pods, polychaete worms, and echiuroid worms. Polychaete worms and amphipods were the principal food items in smaller fish (10-20 cm), polychaete worms and bivalves and then echiuroid worms and amphipods in larger fish (20-30 cm), and bivalves and echiuroid worms in fish longer than 30 cm. Recurrent group analyses (Fager 1957, 1963; Fager and Longhurst 1968) have been used to demonstrate species associations within the demersal community of the eastern Bering Sea (Kihara 1976, Mito 1977, Pereyra et al. 1976, Bakkala and Smith 1978). The procedure identifies species relationships on the basis of co-occurrence within samples. When joint occur
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