794 



Fishery Bulletin 98(4) 



Females 



Males 



Swan River Estuary 



500 

 400 

 300 

 200 

 100 

 



500 

 400 

 300 

 200 



•g- 100 



c 

 w 



ra 500 

 o 



'" 400 



300 



200 



100 







500 

 400 

 300 

 200 

 100 

 



n=733 



I I I I I I I I I I L_ 



n=894 



l__l I I I I I L_ 



Moore River Estuary 



n=345 



n=387 



1 I I I I I I I I I 1 — I — I — I — I — 1 — I — I 



Nornalup Walpole Estuary 



n=346 



n=265 



I I I I I I I I 1 I I I I I I I I L_ 



Wellstead Estuary 



n=324 



I I 1 I I I I I I 1 L. 



n=331 



I I I I I I i_ 



_J L- 



2 4 6 8 101214 16182022 2 4 6 8 10 12 14 16 1820 22 



Age at capture (years) 



Figure 6 



Von Bertalanffy growth cur\'es titted to length at age data for female and 

 male A(a(i//?o/jo^'n/.s biilcheri caught in the Swan River, Moore River, Nor- 

 nalup Walpole and Wellstead estuaries. 



The values for k for A. hiilchen were least in the Moore 

 River Estuary, i.e. 0.11, and greatest in Lake Clifton, i.e. 

 0.32 (Table 2). The values for L. ranged from a low of 

 367.0 mm for females and 323.0 mm for males in the Nor- 

 nalup Walpole Estuary to a high of 451.6 and 441.5 mm 

 for the corresponding sexes in the Moore River Estuary 

 and Lake Chfton, respectively (Table 2). Estimates of ^„ for 

 both sexes of A. hutcheri in the four estuaries and of the 



males of A. hutcheri in Lake Clifton all lay within the rela- 

 tively narrow range of -0.13 to -0.61 years (Table 2). 



Length-weight relationships 



The equations relating total length and weight of female and 

 male A. hutcheri in each estuary and for males in Lake Clif- 

 ton are presented below, so that, when required, the approxi- 



