FISHERY BULLETIN: VOL. 80, NO. 3 



Surface 



Figure 9.— Progressive vector diagrams for horizontal advection, 

 based on 2-h median larval distributions and currents at Station 270, 

 east of Mornington Island on 17-28 March 1977. a) Advection over 24 

 h of a larva spending 12 h of daylight at the bottom stratum and 12 h 

 of night at the surface (dotted line), a nonmigratory animal at the 

 surface (solid line), and a nonmigratory animal near the bottom 

 (dashed line); b) zoeal substages 1-3 (solid, dashed, dotted lines, re- 

 spectively); c) mysis substages 1-3 and postlarvae (solid, dashed, 

 dotted, dot-dashed lines, respectively); d) 14-d extrapolation of daily 

 resultant vectors: nonmigratory surface (dashed line); nonmigra- 

 tory bottom (dashed line); 12:12 surface bottom larva (dotted line); 

 median larva (solid line). 



10 km 



Scale a,b,c 







M3 





SURFACE 



\ 

 \ 



Z3 



Z2 



Z\ \ 



40 km 

 Scale d 





<e 



\r..- 



t 



N 



550 



