O A H U 



-2l°30- 



-21° 20- 



^MAKAPUU 

 \ POINT 



Figure 1. --Fishing area off the northeast coast of Oahu, Territory of Hawaii. 



about 4 miles wide and 10 miles long. Only 

 rarely was there fishing outside of this area. 



In July and August 1953, 148 skipjack were 

 caught by pole-and-line fishing, using nehu 

 (Stolephorus purpureus ) as live bait. These fish 

 were not included in the analysis of troll catch 

 rate, although they were used in certain other 

 analyses in this report. 



Fishing was done mostly during the summer 

 months, but some effort was expended in other 

 months of the year. The fishing periods for each 

 year were as follows: 



Year Months of fishing 



1951 January to October 



1952 June to August; October 



1953 June to August 



1954 June to December 



1955 January; May; July to September 



At the laboratory the following 

 determinations were made on the non-viable fish: 



length - -distance in centimeters from the tip 

 of the closed jaws to the fork of the tail as 

 determined on a measuring board (Hiatt and 

 Hamre 1945) 



weight - -measured to the nearest one-fourth 

 pound on a dial-type spring scale with 

 weighing pan 



sex and maturity -- f r o m examination of 

 gonads, with gonad stage indicated by 

 1, immature; 2, maturing; 3, nearly 

 mature; 4, ripe; and 5, spent 



food - -stomach contents were removed and 

 preserved in jars containing 10-percent 

 formalin; later, the total amount of food 

 was determined volumetrically, the organ- 

 isms were identified to the most convenient 



