56 



Fishery Bulletin 105(1) 



Quarter 1 



Quarter 3 



Skipjack 



-I 1 1 1 1 r 



1 997 1 999 2001 



Year 



Quarter 2 



1999 



Year 



T 1 1 1 1 1 1 r 



1996 1997 1999 2001 



Year 



Quarter 4 



1999 



Year 



BsSQ 



"1 1 r~ 



2 3 4 



Quarter 



Bigeye 



Figure 4 



Predicted changes in annual purse-seine catches of bigeye iThuninis obesus) and skipjack {Katsuwonus pelamis) tuna 

 associated with a closure of the hotspot areas from Figure 1 for each quarter of the year. The left and middle panels 

 indicate the change in annual catch for bigeye (B) and skipjack (S) tuna estimated to occur in each year of the 1995-2002 

 period if that area was closed in the 1st, 2nd, 3rd, and 4th quarter, respectively. The plots on the right summarize the 

 predicted changes in bigeye and skipjack tuna catch over the eight years for a closure in each seasonal quarter. The white 

 bar indicates the median change, the dark rectangle indicates the interquartile range (25"'-75th percentiles), and the 

 outer lines indicate the extremes. The horizontal dashed line represents zero (i.e., no change in catch). 



Table 2 



Summary of annual purse-seine effort and catch per unit of effort for bigeye [Thunnus obesus) and skipjack (Katsuwonus pelamis) 

 tuna by set type (FOB=tuna school associated with floating object! s); UNA=tuna school not unassociated with floating object(s)) 

 for the three areas modeled in the "practical" closure. A "practical" was a more practical, continuous region. It extended from 

 5°N-10°S, to 90°-120°W. The total area of this closure was the same as the total area of the hotspot regions. The means and 

 standard deviations (SD) were calculated from annual values for 1995-2002. 



Number of sets 



Bigeye catch per set 



Skipjack catch per set 



Area 



FOB 



UNA 



FOB 



UNA 



FOB 



UNA 



