804 



Fishery Bulletin 101(4) 



4.5 



1.5 



*,(« S» - » . - . ^i^^^ y» 4t - - , - 



§^ -S**^ 



100 



200 300 



Fork length (mm) 



400 



500 



Figure 4 



Diameter of the first, second, and third translucent zones in otoliths from blue 

 rockfish iSebastes mystinus) at various lengths. Dashed lines represent the 

 mean diameters. 



20 25 30 



Age (yr) 



Figure S 



Von Bertalanffy growth models for all male (solid line) and female (dashed line) 

 blue rockfish {Sehastes mystinus). (;i=348 for males and /i = 1348 for females.) 



rate and calculated k (instantaneous growth rate) to 

 range from 0.13-0.16/years, which was comparable to k in 

 our study (0.2/year for males and 0.15/years for females; 

 mean ^=0.17/year). Karpov et al. (1995) calculated k for 

 the combined male and female growth rate from modal 

 progressions studies to be 0.12/year. This also was similar 

 but less than the k from our present study. On the other 

 hand, McClure ( 1982) estimated a much faster growth rate 

 for blue rockfish off Oregon, with a k for males of 0.23/years 

 and for females of 0.31/year. Although the Oregon fish were 



larger at age (Fig. 7), maximum sizes from Oregon and 

 California were similar; the largest specimen from Oregon 

 was 460 mm FL (McClure, 1982) and the largest individual 

 from our study was 444 mm FL. 



The difference in growth between studies may be attrib- 

 uted to a temporal difference in the collection offish. Two 

 thermal regime shifts have occurred in the Pacific Ocean 

 over the past 25 years; one in 1977 and the other in 1989 

 (Hare and Mantua, 2000). The samples from our study 

 came from two different thermal regimes, but the growth 



