224 



Fishery Bulletin 102(1) 



Percent time 

 00 75 50 25 25 50 75 100 



0-5 



5-10 



10-50 



50-100 



~ 100-150 



g 150-200 



200-250 

 250-300 

 300-500 

 500-700 

 700-1000 



,r 



Percent time 

 50 25 25 50 75 



45 



25 



Percent time 

 5 25 



28-30 

 26-28 

 24-26 

 22-24 

 20-22 

 18-20 

 16-18 

 14-16 

 10-14 

 10-12 

 6-10 

 <6 



_i i . i i_ 



45 



j i 



Percent time 

 50 25 25 50 75 



Figure 2 



Depth and temperature distributions of two bigeye thresher sharks showing diel vertical migration. 

 The tags recorded depth and temperature at two-minute (A, B> or 30-second (C, Di intervals; data 

 are summarized into a series of bins for the full duration of each track. (Al Depth distribution for the 

 Gulf of Mexico shark is shown as the percentage of day (□> and night  spent within depth bins 

 ranging from the surface to 1000 m. Error bars are 1 SE. (B) Temperature distribution for the Gulf 

 of Mexico shark is shown as the percentage of day (□) and night  spent within temperature bins 

 ranging from 6°C to 30°C. The shark occupied cool waters during the day and warm waters during 

 the night, a consequence of its deep daytime and shallow nighttime habitats. Error bars are 1 SE. 

 (Cl Depth distribution for the Hawaii shark showing diel vertical migration. The shark spent most 

 of the daytime at the base of the thermocline and must of the nighttime in the mixed layer and upper 

 thermocline. iD) Temperature distribution for the Hawaii shark showing cool daytime and warm 

 nighttime water temperatures. 



