O'Malley et al.: Effects of exploitation evident in age-based demography of Pristipomoides flavipinnis and P. auricilla 
329 
□ Male 30 
■ Female 25 
20 
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 
£ 30 
o 
5 25 
20 
15 
10 
5 
0 
5 
10 
15 
20 
25 
30 
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 
Fork length (mm) 
B 
o Male 
■ Female 
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 
a Fished 25 ■ 
■ Unfished 20 
15 • 
□ Fished 
■ Unfished 
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 
Age (yrs) 
Figure 3 
(A) Size and (B) age compositions for male and female goldflag jobfish (Pristipomoides auricilla ) sampled in 2014 in 
the Mariana Archipelago and (C) size and (D) age compositions for goldflag jobfish sampled from fished and unfished 
areas in this region. 
grew more slowly. However, the difference in was small 
(14.5 mm FL), as were the differences in K (0.07) and in 
the EVB-predicted FL at age for fish with the most com¬ 
mon ages (1.13% for fish 5-6 years old). Significant but 
small differences were also found between the fished and 
unfished populations. The L^ in the unfished population 
was 21.3 mm FL smaller, and fish grew slightly faster rel¬ 
ative to the fished population. These differences in growth 
of goldeneye jobfish between fished and unfished areas 
were further confirmed by 5-6% differences in the EVB- 
predicted FL at age for fish with the most common ages 
(5-6 years). Overall, the fitted growth curve for goldeneye 
jobfish indicates that growth reached an asymptote 
between ages 6 and 9, corresponding to 20-30% of the 
maximum age (Fig. 4). 
The fit of the EVB model to the age and length data for 
goldflag jobfish supported the models with factors for sex 
and fishing pressure (Table 2). The difference in AIC e 
between the model fitted with sex and fishing pressure 
and the model with the next-best fit (just fishing pressure) 
was 46.9. In this species, males reached a larger L^ than 
females and, consequently, grew more slowly. However, the 
difference in was small (23.7 mm FL), as were the dif¬ 
ferences in K (0.03) and in the EVB-predicted FL at age for 
Table 2 
Comparisons of extended von Bertalanffy growth func¬ 
tions fitted to length-at-age data for goldeneye jobfish 
(Pristipomoides flavipinnis) sampled from the Samoa 
Archipelago in March and October 2012 and in March 
2016 and for goldflag jobfish (P. auricilla) sampled from 
the Mariana Archipelago in June and July 2014. Models 
with no covariates and with sex, fishing pressure, and sex 
and fishing pressure as covariates were compared by using 
the Akaike information criterion corrected for small sam¬ 
ple sizes (AIC c ). Also provided are the differences in AIC c 
between models (AAIC c ). 
No. of 
Species 
Model 
parameters 
AIC c 
AAIC c 
P. flavipinnis 
Sex, fishing 
9 
3423.3 
0.0 
Fishing 
6 
3429.4 
6.1 
Sex 
6 
3448.0 
24.7 
No covariates 
3 
3456.1 
32.8 
P. auricilla 
Sex, fishing 
9 
2336.7 
0.0 
Fishing 
6 
2383.6 
46.9 
Sex 
6 
2413.0 
76.3 
No covariates 
3 
2453.6 
116.9 
