and of 7 striped marlin, only 2 were landed. Two sailfish were also cap- 

 tured. No broadbill swordfish were seen. 



At the termination of this work the Explorer was shipped to Panama for 

 refitting and storage until plans could be made for work during the follow- 

 ing year. 



I ril T H Y €M. 4M; I C A I. STUDIES 



IN ORDER to obtain specimens for study a total of 123 days were actually 

 spent at sea in angling operations from April 27 through October 12. In 

 addition to 54 days fishing from the Explorer in northern Chile (April 27 

 through July 6) a chartered cruiser, the Marlin, was used for the same 

 purpose during 31 days. During the period of work off northern Peru, 45 

 days were devoted to angling operations, from July 24 through September 

 10. Ofif Ecuador, 24 days were devoted to angling from September 19 

 through October 12. 



During the angling operations (54 days) off northern Chile (Figure 10), 

 361 striped marlin (Makaira fnitsukurii) were sighted. Baits were pre- 

 sented to 185 and 107 strikes were obtained. Only 75 fish were hooked and 

 45 were actually landed. During the same period, 93 broadbill swordfish 

 {Xiphias gladiiis) were sighted, baits presented to 56 and 27 strikes ob- 

 tained. Only 17 fish were hooked and 11 were actually landed. No black 

 marlin (Makairi marlina) or sailfish (Istiophorus greyi) were seen during 

 the expedition's operations off northern Chile (April 27 through July 6) 

 The area covered in northern Chile (about 16,000 square miles) com- 

 prised about 1 60 miles of coastline, from Arica to Punta Lobos, and up to 

 100 miles offshore. Visibility and sea conditions were generally good, and 

 no rough seas encountered. No blind trolling for billfishes was conducted in 

 Chilean waters. Baits were presented only after the fish had been sighted. 



Off northern Peru, only 3 striped marlin were sighted during the angling 

 operations in these waters (45 days). Baits were presented to only one, 

 and although a strike was obtained, the fish was not landed. During the 

 same period 34 black marlin were sighted, baits presented to 19 and 8 

 strikes obtained. Only 6 fish were hooked and 2 were actually landed. 

 Only 4 swordfish were sighted in Peruvian waters and baits presented to 

 three with no strikes obtained. No sailfish were seen from the Explorer 

 during the expedition's stay in Peruvian waters (July 24 through Septem- 

 ber 10) but 2 specimens captured by commercial fishermen were seen at 

 the Port of Mancora on August 15. The area covered in northern Peru 



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