80 



Fishery Bulletin 103(1) 



in 



C/3 



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Parameter 



Figure 6 



Relative partial sums of squares (RPSS) at three levels of uncertainty for param- 

 eters of the Sebastes bioenergetics model. Parameters are listed in Table 1. (A, C, E) 

 Females. (B, D, F) Males. Parameter coefficients of variation (CV) were 2% (A, B), 

 10% (C, D), or 20% (E, F). 



Discussion 



According to the generic rockfish bioenergetics model, 

 repeated exposure to El Nino conditions lowered the 

 growth, maturation rate, and reproductive level of S. 

 mystinus. This happened at both the individual and 

 per-recruit scales; the latter may be most relevant when 

 placing a cohort of fish into a community context because 

 younger age groups have the greatest potential energy 

 demand when mortality is accounted for. In El Nino 

 years, increased temperatures caused respiration rates 



of both sexes to increase in contrast to respiration rate 

 in the baseline model, whereas lower growth rates and 

 poor fecundity reduced energy demands. In the long 

 term, these rates equated to a net decrease in energy 

 consumption, which was more pronounced in females 

 than in males because of the higher growth rate and 

 reproductive investment for females. Ironically, adding 

 mortality through fishing pressure lessened the effect 

 of El Nino on S. mystinus consumption in contrast to 

 baseline conditions, but that was because rockfish in the 

 El Nino models took longer to reach sizes vulnerable to 



