AUG. 20 



CRUISE 6608 

 AUGUST 1966 



(S) NOON SfATIONS 



# MIDNIGHT STATIONS 



• OTHER STATIONS 



28" 

 N. 



127" 



26' 



25° 



24" 



^23" 



22" 



116"W. 115" 114" 113" 112° 111" 



Figure 7. — Track and station positions for cruise 6608. 



110° 



109" 



more restricted than on most of the other cruises 

 because no standard micronekton hauls were made. 

 Figure 8 shows four areas with concentrations 

 over 40 nil./l,000 m.^ The northern area was in 

 water whicli was cool and rich in chlorophyll a 

 (over 0.2 mg./m.^ ) ; the eastern area was partly 

 in and partly adjacent to the same kind of water; 

 the southwestern area was in and adjacent to a 

 tongue of cool water, with chlorophyll a concen- 

 trations about 0.1 mg./m.^; and the remaining 

 small area was in warmer water where no chloro- 

 phyll data were obtained. 



The data on tuna occurrence for the period of 

 the cruise, August 20-26 (fig. 8) show a single 

 record in the northern part of the area, located, 

 like those on cruise TO-6+-2, on the edge of an 

 area that was rich in food but rather cold. The 

 other records show a distribution of tuna right 

 across one of the tongues of cool water, where tem- 

 l^eratures were nevertheless high enough (over 

 20° C.) to permit the tuna to exploit the high con- 

 centration of red crabs; the tuna were located 

 partly in and partly on the edge of this concen- 

 tration of food. A significant amount of fishing 



16i 



U.S. FISH AND WILDLIFE SERVICE 



