Figure 5. John Manning and Donald Bates, aboard purse-seiner Corsario, 

 during longline cruise off Mancora, Peru. 



the period of August 5 to the 26, a good run of black marlin afforded 

 many specimens for study. No more marlin were available for study be- 

 tween August 26 and September 12. 



Arrangements were made, while in Peru, for a cooperative investigation 

 with the Wilbur-Ellis fishing company, through the courtesy of Mr. Donald 

 Bates. Longline gear supplied by the expedition was made up under Mr. 

 Bates' supervision in the form of an American modification of the Japa- 

 nese gear and was operated for the first time in these waters on an experi- 

 mental basis. In spite of the abundance of giant squid, the tests were gen- 

 erally successful. In addition to experimental fishing, the company kindly 

 made it possible to take bathythermograph observations and plankton 

 samples from the purse seiner Corsario. 



Longline operations were continued from August 13 to October 15 but 

 the Explorer, manned by Walter Gorman and Howard Thuct, left Cabo 

 Blanco for work in Ecuadorian waters on September 12. The capture of 

 billfish was resumed in the waters between Salango and Isla La Plata, 

 Ecuador, on September 19, and continued until October 12, when the 



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