Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 19 20 21 22 23 Ti 25 26 28~ / \ J 15 16 17 LENGTH GROUPS (METRES) 28 Fig. 152. Blue whales (continued). Length frequencies for different periods. Females. Males. of comparatively uniform prominence. Perhaps the best example is furnished by the figures for males and females in the half-season February to May 1925. There are three maxima for each sex showing that males are commonest at 18-19 'â¢â > 21 rn. and 24 m. and less numerous at 20 m. and 22-23 '-i i that females are more numerous at 20 m., 23 m. and
Discovery reports (1929) Discovery reports discoveryreports11929inst Year: 1929 19 20 21 22 23 Ti 25 26 28~ / \ J 15 16 17 LENGTH GROUPS (METRES) 28 Fig. 152. Blue whales (continued). Length frequencies for different periods. Females. Males. of comparatively uniform prominence. Perhaps the best example is furnished by the figures for males and females in the half-season February to May 1925. There are three maxima for each sex showing that males are commonest at 18-19 'â¢â > 21 rn. and 24 m. and less numerous at 20 m. and 22-23 '-i i that females are more numerous at 20 m., 23 m. and 26 m. and less numerous at 21-22 m. and 24 m. In other words these whales tend to approximate to one of three different sizes which may be regarded as (i) small immature (18-19 m. in males, 20 m. in females), (2) large immature (21 m.
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