CAREY and ROBISON; DAILY PATTERNS IN ACTIVITIES OF SWORDFISH 



4.5 h included 1.5 h at 27° C, 1.5 h at 14° C, and 

 1.5 h at 27° C for an average w^ater temperature of 

 22°-23° C before the descent. The swordfish is 

 clearly able to function over a wide range of 

 ambient temperatures. 



The coldest water which no. 7 entered was 8° C. 

 This may represent a lower preferred limit for 

 swordfish, as it agrees with the 8° C temperatures 

 reported for deeper sightings from research sub- 

 marines (Zarudski and Haedrich 1974). The 8° C 

 temperature may only be coincident with a light 

 or depth limit or the location of prey; we look 

 forward to experiments with swordfish in areas 

 where water <8° C is readily available. 



ACKNOWLEDGMENTS 



This work was supported by a grant from the 

 Culpeper Foundation; by a contract from NMFS, 

 NOAA; and by grant PCM76-81612 from the 

 National Science Foundation. The experiments 

 could not have been done without the swordfish 

 provided to us by Captain Bob Vile, pilot Pat 

 Utely, and owner Milton Shedd of Sea World; and 

 Captain Jimmy Ruble and the crew of Diane 

 Marie. We thank the fishery officials of Baja 

 California Sur, Mexico, for permission to work 

 in that area; Jack Casey, Northeast Fisheries 

 Center Narragansett Laboratory, NMFS, NOAA, 

 for his support and encouragement; and Captain 

 Martin Bartlett, John Kanwisher, and many 

 other fishermen and scientists of the Woods Hole 

 community who donated time and materials and 

 provided an atmosphere which made this project 

 possible. 



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291 



