## 3 Results
### Regional Movements  
Regional movements were obtained from 1610 detections at 104 stations in cooperative arrays. Three of the 32 small juveniles (9.4%), six of the 11 large juvenile (54.5%), and seven of the 21 mature tiger sharks (33.3%) were detected on acoustic arrays outside The Bahamas (Figures 5 and 6). The results of logistic regression showed that the probability of acoustic detections outside Bimini and The Bahamas was significantly correlated with sex (\(p\)-value \(<\) 0.001) and fork length at the time of tagging (\(p\)-value = 0.03), with females and larger tiger sharks more likely to be detected on other arrays throughout the region (Figure 6). Detections on cooperative arrays were primarily along the southeastern USA and the Gulf of Mexico coasts (Figure 6). Of those that dispersed from The Bahamas, none of the three juveniles (0%), three of the six large juveniles (50%), and three of the seven mature (42.9%) tiger sharks later returned to Bimini. For example, mature female tiger shark #16741 departed the Bimini area in February 2017 and was then detected off the coast of South Carolina during May and June of the same year, a distance of \(\sim\)750 km. She returned to the northern Bahamas in January 2018 and back near Bimini in January 2020. Similarly, mature female #17559 departed Bimini on 7 August 2018 and was then detected off the North Carolina coast on 7 September 2018, a distance of \(\sim\)1000 km. She returned to the Bimini area during March 2019 and again during January 2020.  
Movements were obtained from SPOT tags deployed on eight tiger sharks, six of which also had an acoustic transmitter implanted. SPOT tag models 258 and 364 (estimated battery life of 300 days) had a combined average transmission duration of 105.3 (\(\pm\)64.7) days, whereas model 257 (estimated battery life of 1286 days) had an average transmission duration of 322 (\(\pm\)229.3). SPOT-tagged tiger sharks spent an average of 33.0% (\(\pm\)25.5) of this tracking duration within the EEZ of The Bahamas (Table 2). Utilization distributions indicated a core use area surrounding Bimini and the western Bahamas. However, tiger sharks also spent considerable time in the vicinity of the southeastern USA, Cuba, and Hispaniola (Figure 7). Mean 50% UD encompassed 33,287.5 (\(\pm\)36,186.2) km\({}^{2}\) and mean 95% UD encompassed 431,825 (\(\pm\)586,583.8) km\({}^{2}\).  
Figure 6: Lines represent stylized movements between acoustic detections on cooperative receiver arrays throughout the southeastern United States of America and The Bahamas for (**A**) small juvenile, (**B**) large juvenile, and (**C**) mature tiger sharks, _Galeocardo cwivier_.  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline
**PTT ID** & **Tag Date** & **Sex** & **FL** & **SPOT Model** & **Days Transmitting** & **Number of Locations** & **50\% UD** & **9\% UD** & **Time (\%) in EEZ** \\ \hline
170335 & 13 February 2018 & F & 190 & 257 & 498 & 3369 & 22,000 & 378,800 & 4.2 \\
170362 & 3 December 2017 & F & 240 & 258 & 72 & 190 & 19,700 & 102,600 & 48.6 \\
170471 & 16 January 2019 & F & 303 & 257 & 153 & 434 & 22,000 & 301,800 & 40.5 \\
170472 & 10 May 2018 & F & 310 & 257 & 540 & 121 & 91,800 & 1,796,300 & 38.7 \\
170473 & 26 June 2018 & F & 285 & 257 & 97 & 804 & 89,900 & 637,000 & 2.1 \\
170474 & 24 June 2018 & F & 302 & 258 & 31 & 307 & 4700 & 28,600 & 71 \\
170469 & 30 September 2020 & F & 246 & 364 & 150 & 1020 & 1000 & 108,000 & 7.3 \\
170470 & 9 December 2019 & F & 267 & 364 & 168 & 137 & 15,800 & 101,500 & 51.7 \\ \hline \end{tabular}
\end{table}
Table 2: Summary information for tiger sharks, _Galoverbolds cover_, tagged with Smart Positioning and Temperature (SPOT) satellite tags near Binnli, The Bahamas, Utilization distribution (UD) represents the 50% and 95% levels of area (km\({}^{2}\)) occupied. “Time (%) in EEZ” was calculated as the percentage of days at liberty spent within The Bahamas Exclusive Economic Zone (EEZ) based on daily location estimates. The ’SPOT model’ shows the transmitter model number used for that individual.