96 
Fishery Bulletin 1 14(1) 
Figure 4 
Observed and estimated maturity at age of female sablefish ( Anoplopoma fimbria) 
collected in the winter of December 2011 on the (A) continental shelf, (B) slope, or (C) 
both shelf and slope (pooled). Fish that would skip spawning were classified as either 
mature (black points and lines) or immature (gray points and lines). Larger, gray 
points indicate that data did not differ at that age because there were no fish that 
were going to skip spawning. Logistic regression models and 95% confidence intervals 
at each age are presented. In panel C, solid lines indicate the age at maturity for the 
pooled samples. The maturity curves (dashed lines) for the shelf and slope, from pan- 
els A and B respectively, are also included in panel C for a comparison with pooled 
data. The x-axis was truncated at age 20 because the proportion mature at ages older 
than 20 all remained at 100% and had increasingly small confidence intervals. 
in the population. The ^40% in the most recent year 
(2013) followed the same pattern: the value from the 
base model, the mean of summer longline surveys, 
and value from the winter survey (when SS were 
classified as mature) were similar: 9.40%, 9.45%, and 
9.30%, respectively. The data from the summer long- 
line survey conducted in 2011 provided a lower esti- 
mate (8.45%), and the estimate from the winter sur- 
vey (when fish that would skip spawning were clas- 
sified as immature) was the lowest (7.45%). A lower 
F 4 . 0 % translates to more conservative management 
and lower allowable catches. 
Fecundity 
Fecundity was calculated for 47 sablefish. Total fecun- 
dity, measured as the total number of oocytes per fish 
that will be spawned in the current season, ranged 
from 214,577 to 900,700. There was no evidence of 
batch spawning (postovulatory follicles) or atresia in 
any ovaries containing maturing, vitellogenic oocytes. 
The mean number of oocytes per gram of sample 
weight was significantly higher for younger fish (ages 
< 12 ), with a mean of 10,667 (standard error [SE] 467) 
than for older fish (ages >12), with a mean of 8804 (SE 
