7b 



Fishery Bulletin 103(1) 



5 10 15 20 



Age (y) 



Figure 2 



Estimated energy consumption by S. mystinus under baseline model con- 

 ditions. (A) Females and males at the per-individual scale. (B) Females 

 and males at the per-recruit scale, assuming a mortality rate (Z) of 0.2 

 (i.e., no fishing mortality). 



Table 3 



Final weights and cumulative energy consumptions for 

 female and male S. mystinus from bioenergetics models 

 run under baseline and El Nino conditions. All values are 

 taken from the end of the 30th year. Cohort-A and cohort-B 

 individuals experienced five and eight El Nino events, 

 respectively (see Figs. 3 and 4). 



Final weight (g) 



Total 

 consumption (MJ) 



Model 



Females 



Males Females Males 



Baseline 

 Cohort A 

 Cohort B 



1,134.3 

 1,129.4 

 1,126.8 



617.2 

 616.5 

 616.1 



285.0 

 278.1 

 273.6 



174.6 

 173.3 

 172.1 



fecundity (due to slower growth), resulting in lower 

 per-recruit consumption to meet reproductive costs. 

 Thirty-year cumulative per-recruit energy consumption 

 was 20.0 MJ for cohort-A females (3.2% lower than 

 the baseline value), and 19.4 MJ for cohort-B females 

 (6.3% less than the baseline value). Cumulative per-re- 

 cruit consumption by cohort-A males was 14.5 MJ (1.9% 

 lower than baseline), whereas cohort-B males consumed 

 14.2 MJ (4.4%. less than the baseline level). The reduc- 

 tion of cumulative egg production was also more drastic 

 at the per-recruit scale: cohort-A females produced 15% 

 fewer eggs than the baseline level, whereas cohort-B fe- 

 males produced 23% fewer eggs at the per-recruit scale 

 (Fig. 4C). These reductions in egg production were re- 

 lated to smaller size, lower fecundity in El Nino years, 

 delayed maturation, and accumulative mortality, all of 

 which allowed fewer females to reach maturity. 



