Stanley and Kronlund: Life history characteristics for Sebastes brevispmis 



681 



1500  



1000 



500 



oo 



o °° 8o o 

 o°oo ° 



°t + °8 



o B + 



o + 



10 



20 



30 



40 

 Age 



50 



60 



70 



0.6 



0.5 

 0.4 

 0.3 

 0.2 

 1 



B 





10 



20 



30 



40 

 Age 



50 



60 



70 



5 1500 



1000 



500 



o'<5 



-Jo o + 



2000 



3000 

 Somatic weight (g) 



4000 



Figure 8 



Silvergray rockfish (Sebastes brevispinis) fecundity (thousands of eggsl versus 

 lA) age, (B) relative fecundity (thousands of eggs/g somatic weight) against 

 age, and (C) fecundity against somatic weight. Solid circles indicate two 

 possibly anomalous points. The plus symbols indicate females infected by 

 the Sareotaces areticus parasite. The dashed curves represent the limits of 

 point -wise 95% confidence intervals. The "rug" along the x-axis of each plot 

 shows the frequency of observations of age or size classes. 



appears to be associated with reduced fecundity, albeit 

 this conclusion is based on three observations. This 

 conclusion is consistent with qualitative observations by 

 the senior author that the gonads of infected silvergray 

 rockfish tend to be smaller. 



Silvergray rockfish fecundity appears typical of the 

 genus as summarized in the meta-data treatment by 

 Haldorson and Love (1991). Predicted fecundity for a 



40-year old female exceeds 1,250,000 oocytes, although 

 the maximum observed fecundity in a small sample 

 was almost 2,000,000. The slope of the relationship of 

 log fecundity to log length from our study was 4.283, 

 close to the mean of 4.10 reported for other rockfish 

 (Haldorson and Love, 1991). 



Haldorson and Love (1991) noted that the ratio of 

 fecundity at the age of 50% maturity versus fecundity 



