324 



Fishery Bulletin 94(2), 1996 



range of age classes from a number of consecutive 

 years would be needed to determine if growth rates 

 were variable between years. 



The age structures for populations of L. adetii and 

 L. quinquelineatus among reefs usually showed sev- 

 eral strong year classes that were variable among reefs. 

 The occurrence of strong year classes is well docu- 



mented in the commercial catches of many temperate 

 species (Hjort, 1914; Sissenwine, 1984; Rothschild, 

 1986) and has recently been observed in a number of 

 tropical species (Doherty and Fowler, 1994b; Ferreira 

 and Russ, 1995). Year-class strength in both temper- 

 ate and tropical species has been linked to early life 

 history processes (e.g. Hjort, 1914; Sissenwine, 1984; 



240 



2111) 

 160 

 1211 



NO 



411 



; , !t_«_«_?_» 



• • • 



Kih 



L r 214.1 (,_ f -0 M25 (..14 12)) 

 r = 0.421 



II 2 4 K 1(1 12 14 16 IK 20 22 24 20 2K 30 32 





John Urvwer 



l- 204.1 ( | _(,-<> H'8(" 2 789)) 



r = 0.652 



II 2 4 K 10 12 14 10 IK 20 22 24 20 2K 30 32 



2 4 K 10 12 14 10 IK 20 22 24 26 2K 30 32 



(I 2 4 K 10 12 14 10 IK 20 22 24 26 2K 30 32 



2 4 8 10 12 14 10 IK 20 22 24 20 2K 30 32 



I) 2 4 S 111 12 14 10 IK 20 22 24 20 28 M) 32 



Age (years) 



Figure 5 



Von Bertalanffy growth curves and observed length at age for L. quinquelineatus among individual reefs in the central 

 Great Barrier Reef. 



