. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 20 30 40 10 20 30 40 Length (cm) 10 20 30 40 Figure 34-5. Length composition of yellowfin sole of the eastern Bering Sea as determined by research vessel surveys in 1975,1976, and 1978. 100 2 75 (0 S *. 50 c 0) u 5 25 o. r MALES mT 10 15 lOOr V 3 m S +.» c 0) u « a. 75- 50- 25 10 15 l7Tr*''!Mf:WMt W^. 20 25 Length (cm) ':'f*ft'-ft''f%>>l%^ 30 35 â FEMALES r r-T' m 20 25 Length (cm) 30 35 I 9 1000 RESEARCH VESSEL SURVEY DATA OBSERVER DATA 1973 67 66 Innnnr 67 Hnnnn, by J
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 20 30 40 10 20 30 40 Length (cm) 10 20 30 40 Figure 34-5. Length composition of yellowfin sole of the eastern Bering Sea as determined by research vessel surveys in 1975,1976, and 1978. 100 2 75 (0 S *. 50 c 0) u 5 25 o. r MALES mT 10 15 lOOr V 3 m S +.» c 0) u « a. 75- 50- 25 10 15 l7Tr*''!Mf:WMt W^. 20 25 Length (cm) ':'f*ft'-ft''f%>>l%^ 30 35 â FEMALES r r-T' m 20 25 Length (cm) 30 35 I 9 1000 RESEARCH VESSEL SURVEY DATA OBSERVER DATA 1973 67 66 Innnnr 67 Hnnnn, by Jl nnnnnnr DO JD nnnnâ ^ Q Hnnrnr Hr-ii-in 00 I Innr-ir^,-, 70 69 r-i IL -^n bb nn___ xiD bb On. n be -ân no- lo 12 14 2 4 6 Age 10 12 14 Figure 34-6. Age composition of yellowfin sole as shown by data from NWAFC research vessel surveys in June- August and by observer samples from the Japanese flounder fishery in September-December. Year-classes for certain ages are shown above appropriate bars. 100 = 75 (0 S *- 50 c 0) u O 25 Q. FEMALES J] 10 15 20 Age (yr) 25 Figure 34-7. Maturity composition of yellowfin sole from the eastern Bering Sea in May-June 1973, by length for males, by length and age for females (after Wakabayashi 1974). seven (Laevastu and Favorite 1978), about the age (seven or eight years) when the exploitable stock reaches its maximum size in weight (Wakabayashi 1975). Length-weight relationships, growth, and mortality Length-weight relationships obtained in 1975 and 1976 show that females are only shghtly heavier than males (approximately 1-10 percent) from lengths of 20-30 cm (Table 34-3). Von Bertalanffy growth curves (Fig. 34-8) and their parameters (Table 34-4) illustrate the similarity of growth characteristics in males and females. Six-year means of observed lengths and calculated weights (Table 34-5) indicate
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