NOTE Klimley et a\. Occurrence of Thunnus albacares in the Gulf of California 



687 



Apr 



May 



Aug 



Sep 



Oct 



Nov 



Dec 



'I ' 

 Jan 



Feb 



Apr 



23- 

 21- 



19 

 IT- 

 IB- 

 IS- 

 11 

 9 

 7 

 5 

 3 

 1 



Apr 



(itey 



Aug 



Sep 



Oct 



Jun Jul 



IVIonth of year 



Figure 2 

 Chronology of daily visits by 23 tagged yellowfin tuna to the seamount and temperature record over a 30- 

 month period beginning April 1998 and ending October 2000. Each visit, indicated by a solid diamond, is 

 based on the detection of a tag during a 24-h period by either the north (ESN) or south (ESS) monitoring 

 stations. The lines in the graphs show that the ultrasonic tag had yet to be recovered from a yellowfin tuna. 

 T = day of tagging, C = day of capture, and F = date of shedding of tag. 



individuals (nos. 5, 19, 21, and 23) stayed for longer peri- 

 ods of time, ranging from six to 18 months. One of these 

 tunas (no. 51 was also caught by a fisherman. It is likely 



that some tunas are nomadic and stay only a single day, 

 whereas others are resident, remaining at the seamount 

 throughout the year. 



