Sarre and Potter: Variation in age compositions and growth rates of Acanthopagrus butcheri 



787 



120°E 140°E 160°E 



15°S 



20°Si 



35°S 



Moore River 

 Estuary 



Indian 

 Ocean 



Nornalup 

 Walpole Estuary 



Wellstead 

 Estuary 



Southern Ocean 



Figure 1 



Map showing the location of the four estuaries and Lake Clifton in southwestern Australia from which samples 

 of Acanthopagrus hutchen were collected, together with individual maps of each estuary. The shaded area of the 

 Swan River Estuary represents the region sampled in our study. 



pie of 126 of the sectioned otoliths were then compared 

 with the numbers of annuli on scales removed from the 

 same fish. The scales used for these comparisons, which 



were obtained from above the lateral line and directly 

 behind the operculum, were mounted between glass slides 

 and examined microscopically under reflected light. 



