CONTENTS 



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Various arrangements of longline gear used on 

 Smith cruises 5. 7„ and 11 < 



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" Smith Cruise 11" longlineo Theoretical depths 

 reached by the hooks at various buoy di stances » 

 Main line length lj,260 ft. 



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Description of longline fishing o o o o o o . <> » o o o » o » o o o o » o » o o , . o o » 3 



Horizontal distribution of deep- swimming tunas o o « o » o = » <. o o » » » 13 



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Size composition and sex ratios of the tuna ooooooooooooooooo 32 



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ILLUSTRATIONS 

 Figure Page 



1 The Hugh Mo Smith „ a converted tuna clipper used 

 for hydrographic surveys (, live=bait fishings 



and longline f ishingo ,,00000000000000000000000000 2 



2 Size of yellowfin tuna taken by various experimen- 

 tal gearo Troll and live-bait caught fish were 

 mostly taken near islands in the central Pacific 

 Oceanj eogoj Line and Phoenix islandso ., » „ o o » o o » » 4 



S A "basket" of longline gearo Each "basket" 



comprises the main line sections p branch lines with 

 hooks o and a float lineo o » o o » » o o » « o <, o « » o 



Usual positions of fishermen and equipment during 

 longline setting, o • . » » o » o o . . o o o . o o » o o o o o o o o » o » 10 



Lateral view of the longline hauler showing the 



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