CRUISE TO -64-1 

 JUNE 1964 



JUNE 9 



JUNE 26 



® 



lis" 



FRONT •. 

 36 -.STATIONS'-. 

 - 37-46 .: 



JUNE 15 



PART 1 (JUNE 9-15) 

 PART 2 (JUNE 15-26) 

 NOON STATIONS 

 MIDNIGHT STATIONS 

 OTHER STATIONS 



W" IM- 113' 112" 111" 



Figure 3. — Track and station positions for cruise TO-64-1. 



28" 



N. 



27"* 



26* 



25° 



24' 



23" 



22* 



110° 



109° 



ward into the cruise area. Such a warm tongue ap- 

 pears frequently at this time of year; for example, 

 it occurred in June 1951 and June 1957 (Anony- 

 mous, 1963) and is shown in several of the BCF 

 June temperature charts. 



The standing stock of surface chlorophyll a was 

 highest in the cold coastal water (upwelling or 

 recently upwelled water), as exjjected. The 1.0 

 mg./m.^ isogi-am follows the coast and includes the 

 principal upwelling areas, where some concentra- 

 tions exceeded 6.0. Concentrations below 0.1 

 mg./m.^ were confined to the offshore region in 



the extreme south of the area (stations 31-34), and 

 none of these values was below 0.06. 



The area of red crab concentration over 40 

 ml./l,000 m.'' was large and broadly similar to that 

 of chlorophyll a concentration over 1.0 mg./m.' 

 Thus, the red crab and its food supply had the 

 same distribution. A separate small area of high 

 concentration lay near Cape San Lucas, and an- 

 other one farther offshore. 



The tuna occurrences were in two groups in the 

 southern part of the area — one (yellowfin tuna 

 onl}') east of the front along the south coast of 



156 



U.S. FISH AND WILDLIFE SERVICE 



