CONTENTS 



Page 



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Acknowledgements „ ........o 1 



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Horizontal distribution of yellowf in tuna ................... It 



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Sizes of yellowf in and bigeye . . ............................ . li; 



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Vertical distribution of the catches ........................ 19 



Catches on experimental gear ..................... ........... 27 



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ILLUSTRATIONS 



Figure Page 



1 Central Pacific Ocean, showing location of longline 

 stations. ...... 



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2 The John R. Manning at the Equator on 180°. The crew 



has just finished setting the longline. ......... 3 



3 Temperature sections corresponding to fishing on 155°, 

 169°, and 180° W. longitude. .................... 



h Temperature sections corresponding to fishing on 120° 



and 130° W. longitude. .......................... 10 



5 Tuna catches on five longline -fishing sections across 

 the Equator during the period February to June 



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