498 



Fishery Bulletin 88(3), 1990 



Figure 7 



Observed over a period spannint; ti days, yellowfin tuna YF8303 

 moved offshore from the reef dropoff on all three nights that it was 

 tracked and returned to the same section of coastline each morn- 

 ing. Day-1 track (A) commenced at 0900 and terminated at 1130 the 

 following day. Track 2 (B) started 2 days later at 1426 and terminated 

 at 0730 next morning. The third track (C) commenced at 1642 and 

 terminated at 0630 on the morning of the sixth day. FAD R was 

 not on station at the time of these tracks. 



shore excursion followed by a return to the 40-fathoni 

 contour on the following morning. 



Fish YF8503 (47 cm FL) was caught on the 50- 

 fathom contour at 1200 and stayed in this vicinity for 

 7.0 hours before moving offshore in the late afternoon 

 to make a 24-nmi nighttime excursion (Fig. 8). The next 

 morning, the fish returned to within 0.5 nmi of the sec- 

 tion of coastline it had left the previous evening, the 

 maximum distance from the point of return being 9 

 nmi. The tracking was temporarily suspended at 0930 

 and resumed at 1150, when the fish was relocated on 



the 40-fathom contour near Kaena Point. P>om here 

 the fish embarked on a prolonged and constant run 

 around the point and along the 40-50 fathom contour 

 of the north shore of Oahu. At sunset of the second day, 

 the fish again moved offshore. When contact was lost 

 at 0100, the fish was 7.5 nmi offshore. 



Fish YF8405 (57 cm FL) was caught on the 50- 

 fathom contour and patroled this area for about the 

 next 24 hours. This fish did not move offshore at night. 

 Tracking was suspended at 0715 the second day, but 

 resumed at 1715 the same evening when the fish was 



