24 



COMMERCIAL FISHERIES REVIEW 



Vol. 28, No. 8 



of the vessel. The direction of drift coincided 

 closely with the motion which each eddy would 

 induce, and the speed appeared directly pro- 

 portional to the slope of the thermocline. This 

 suggests that the field of motion could be de- 

 termined rapidly, and with accuracy adequate 

 for Coast Guard rescue operations, through 

 the use of BT's alone. 



M/V " Townsend Cromwell " Cruise 23 

 (March 14-April 1, 1966): The water struc- 

 ture in the area south of Oahu was studied 



during this cruise by the Bureau's research 

 vessel Townsend Cromwell . Other objectives 

 were to: (1) study the relative abundance of 

 apex predators in this area by means of long- 

 line fishing and to relate it to significant oce- 

 anographic features, and (2) preserve big- 

 eyed tuna blood samples for subpopulation 

 studies. 



An increasing number of Hawaiian long- 

 liners are fishing in this area (between 350 

 to 600 miles south of Oahu), and some of the 



I 



LEGEND : 

 .-BT. 



»- STD STATION. 

 • LONG-UNE STATION. 

 "-PLANKTON TOW. 

 "-BIRD FLOCK. 





'5 \ \lS8' 



- 



l/. ,2- 

 •x 





s4- 





- 





45- 



- 





1 ..- 



A 



- 





15^ 



- 



l. ■■- 



B 



1 1 



Track chart of research vessel Townsend Cromwell Cruise 23 (March 14-April 1, 1966). 



