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Fishery Bulletin 99(4) 
Males Females 
CD 
n 
E 
Carapace length (mm) 
Figure 5 
Yearly length-frequency histograms for male (left) and female (right) Bristol Bay region red 
king crabs <130 mm CL, 1979-1984, revealing mean size-at-age of the 1976 year class by 
modal progression. Arrows indicate the cohort’s mean CL each year, as determined with 
FiSAT; dark shading indicates CLs within 1 SD of the mean. The vertical lines located at 
105 mm CL and 97 mm CL indicate size at reproductive recruitment for males and females, 
respectively, as defined by Zheng et al. (1995a, 1995b). Note that the 1979 histograms have 
been truncated at n = 80 observations in order to make the relevant size modes more visible. 
The 1984 male size mode was not resolved with FiSAT; we considered this size mode to be 
too indistinguishable from the surrounding data to yield an accurate result. 
ing mean CL. This figure represents an attempt to iden- 
tify commonly occurring sizes that may represent the ex- 
pected CLs of consecutive age classes. For male crabs, 
a cluster of three observations occurred at ~35 mm CL, 
separated from the remaining observations, and likely 
representing a single age class; for females, two observa- 
tions occurred at the same approximate size, separated 
from the remaining modes. Considering the estimated age 
