CONTENTS 



Page 



Introduction 



Material and methods 



Results '^ 



Area west of long 92 W '* 



Area east of long 92 W 4 



19 

 Discussion 



Literature cited ^ 



Figures 



Concentrations of skipjack forage measured in the first cruise period of the EAST- 

 ROPAC expedition, Februaiy-March 1967, in ml/1000 m': (A) at night stations; (B) 



at day stations. Heavy dashed lines indicate positions of zonally oriented maxima 5 



Concentrations of skipjack forage measured in the second cruise period of the EAST- 

 ROPAC expedition, April-May 1967, in ml/IOOO m-': (A) at night stations; (B) at 



day stations. Heavy dashed lines indicate positions of zonally oriented maxima 6 



Concentrations of skipjack forage measured in the third cruise period of the EAST- 

 ROPAC expedition, June-July 1967, in ml/lOOOm': (A) at night stations; (B) at day 



stations. Heavy dashed lines indicate positions of zonally oriented maxima 7 



Concentrations of skipjack forage measured in the fourth cruise period of the EAST- 

 ROPAC expedition, August-September 1967, in ml/lOOO m': (A) at night stations; 



(B) at day stations. Heavy dashed lines indicate positions of zonally oriented maxima 8 



Concentrations of skipjack forage measured in the fifth cruise period of the EASTRO- 

 PAC expedition, October-November 1967, in ml/lOOOm': (A) at night stations; (B) at 



day stations. Heavy dashed lines indicate positions of zonally oriented maxima 9 



Concentrations of skipjack forage measured in the sixth cruise period of the EASTRO- 

 PAC expedition, December 1967-January 1968, in ml/lOOO m': (A) at night stations; 



(B) at day stations. Heavy dashed lines indicate positions of zonally oriented maxima 10 



Concentrations of skipjack forage measured in the seventh cruise period of the EAST- 

 ROPAC expedition, February-March 1968, in ml/lOOO m': (A) at night stations; (B) 

 at day stations. Heavy dashed lines indicate positions of zonally oriented maxima 11 



TabI 



es 



1. Summary of results of stomach content analyses of skipjack tuna 2 



2. Percentage volumetric composition of night skipjack forage in the areas of the principal 

 maxima in the EASTROPAC region 12 



3. Percentage volumetric composition of day skipjack forage in the areas of the principal 

 maxima in the EASTROPAC region 12 



ni 



