ROTHLISBERG: VERTICAL MIGRATION OF I'ENAEII) SHRIMP LARVAE 



Figure 8.— Progressive vector diagrams for hori- 

 zontal advection, based on 2-h median larval distri- 

 butions and currents at Station 810, north of Groote 

 Eylandt on 6-7 May 1977. a) Advection over 24 h of a 

 larva spending 12 h of daylight at the bottom stra- 

 tum 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, respectively); c) mysis substages 1-3 and post- 

 larvae (solid, dashed, dotted, dot-dashed lines, re- 

 spectively); d) 14-d extrapolation of daily resultant 

 vectors: nonmigratory surface (dashed line); non- 

 migratory bottom (dashed line); 12:12 surface bot- 

 tom larva (dotted line); median larva (solid line). 



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SURFACE 



40 km 



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Scale d 



549 



