Nos. 10, 12, and 17 in waters around Hawaii {See table ?•. Those 

 of the lower panel are distributed with respect to longitude and 

 calendar quarters as shown in table 2. 



Figure 5. Zooplankton abundance by longitude and 

 season . In this figure there has been included only the hauls 

 taken between latitudes 10° N. and 5°S. The distribution of hauls 

 according to the range of latitude and month of each set of hauls 

 is given in table 3. 



Figure 6. Food of yellowfin tuna. The segments of 

 the circles are proportional to the percentage of the total volume 

 of stomach contents comprised by each of the designated consti- 

 tuents. The right hand circle is based on measurement of stomach 

 contents of 775 yellowfin tuna caught by surface trolling and sur- 

 face live -bait pole and line fishing within about 5 miles of islands 

 in the Line Islands and Phoenix Islands groups; the middle circle 

 on 97 deep-swimming yellowfin tuna caught by longline within 

 about 10 miles of the same islands, and the left-hand circle on 

 214 caught in the equatorial region more than 10 miles from 

 islands. Detailed data appear in J. W. Reintjes and I. E. King, 

 1953 



Figure 7. Equatorial longline fishing cruises. There 

 is summarized in table 4 the longline fishing at the stations charted 

 in figure 7. For the most part, the fishing at each station consisted 

 of the setting and hauling of 40 baskets of gear aggregating 8.4 

 nautical miles of mainline carrying 240 hooks. The only exceptions 

 were the HUGH M. SMITH cruise when 25 to 35 baskets were set 

 and the CAVALIERI cruise when 50 to 85 baskets were fished at 

 each station. Except for SMITH cruise 7 the gear was constructed 

 according to a standard plan (Niska, 1953). In addition to fishing, 

 bathythermograph casts (BT) and plankton hauls were made as 

 shown in the table 4. 



Figure 8. Yellowfin tuna catch/ 100 hooks fJuly- 

 Novemberl. This chart of _yellowfin tuna concentration is based 

 on HUGH M. SMITH cruises 7, 11, 18, JOHN R. MANNING 

 cruises 12. 13, and the CAVALIERI cruise (see table 4). Where 

 stations located within 50 miles of each other gave varying results 

 on successive visits, the values were averaged to determine the 

 position of the contour lines. 



38 



