FISHERY BULLETIN: VOL. 83, NO. 2 



Table 6. — Results of one-way analysis of variance and multiple 

 range tests comparing deviations of age from the standard age in 

 Sebastes diploproa females. Group 1 = between-agency variabil- 

 ity; group 2 = model-induced variability: group 3 = within- 

 agency, within reader variability. 



Source 



df 



Sum of 

 squares 



Mean 

 squares 



Analysis of variance 



Table 7. — Results of one-way analysis of variance and multiple 

 range tests comparing deviations of age from the standard age in 

 Sebastes diploproa males. Group 1 = between-agency variabil- 

 ity; group 2 = model-induced variability; group 3 = within- 

 agency, within reader variability. 



Source 



df 



Sum of 

 squares 



IVIean 

 squares 



13.62 <0.001 



Multiple range lest (least significant difference, a = 0.05) 

 Group 3 ^ Group 2  Group 1 



(Fig. 6). Ages were close to those predicted from 

 the model with the notable exception of the 

 maximum age for both males and females. In each 

 instance, the maximum ages were greater than 

 the maximum otolith section age in the calibra- 

 tion subsample; the estimated section age is there- 

 fore an extrapolation from the model. For the 

 overall subsample, however, the estimated section 

 ages were not significantly different from those 

 determined by conventional methods (paired 

 ^test, a = 0.05). The observed and predicted ages 

 comparing the confirmation subsample with the 

 predicted ages from the hybrid model are not pre- 

 sented graphically, but the form of the curves for 

 both males and females is virtually identical to 

 that for the section age model (Fig. 6). 



Sebastes p/tjurger 



Sebastes pinniger were collected from lat. 43°ir 

 to 49°26'N at depths from 58 to 375 m (Fig. 7). 



110 



to 



< 



MALES 



12 14 16 18 20 22 



WHOLE OTOLITH AGE (YEARS) 



Figure 5. — Mean deviations of whole otolith ages from the 

 confirmation subsample of Sebastes diploproa. Triangles rep- 

 resent model-induced variability, circles within-agency variabil- 

 ity, and squares between-agency variability. 



Pairs of otoliths from a total of 519 male and 369 

 female specimens were taken from the survey. 

 Length frequencies for S. pinniger show a mode at 

 50 cm for males and 52 cm for females. Age fre- 

 quencies of the entire sample (based upon whole 

 otoliths) demonstrate a mode for both males and 

 females at 12 to 13 yr Whole otolith ages from the 

 collections ranged from 2 to 25 for males and 2 to 

 22 for females. 



Subsampling every third pair of otoliths from 

 the whole collection resulted in 171 male and 121 

 female specimens of S. pinniger. Again, this sub- 

 sample was representative of the latitudinal dis- 

 tribution, age range, and length range of the 

 whole sample. Capture, otolith, and age data from 

 these specimens are summarized in Table 8. 

 Otolith section ages in larger fish are generally 

 greater than whole otolith ages, but not to the 



