## 3 Results
### Survey Missions
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & & & **5/19** & **5/21** & & **5/24** & **5/25** & **5/26** \\
**Area** & **Mission** & **Fish ID** & **M20** & **M21** & **M22** & **M23** & **M24** & **M25** & **M26** \\ \hline BPW & M20 & 12010 & **A B** & & & & & \\ BPW & M20 & 12019 & **A B** & & & & & \\ BPW & M21 & 12002 & **A B** & & & & & \\ BPW & M21 & 12003 & **A B** & & a b & a b & & \\ BPW & M21 & 12014 & & **B** & & & & \\ BPW & M22 & 12004 & & **A B** & a b & & a b & a b \\ BPW & M22 & 12013 & & & **A B** & & & \\ BPW & M22 & 12016 & & & **A B** & & & \\ BPW & M23 & 12015 & & & & **B** & a b & a b \\ BPW & M23 & 12018 & & & & **A** & & \\ BPW & M24 & 12006 & & & & & **A B** & b \\ BPW & M24 & 12012 & & & & & **A B** & a b \\ BPW & M24 & 12017 & & & & & **A** & a \\ BPW & M25 & 12005 & & & & & **A B** & \\ BPW & M25 & 12008 & & & & & **A B** & a b \\ BPW & M25 & 12009 & & & & & **A B** & \\ BPW & M25 & 12011 & & & & & **A B** & a b \\ PW & M26 & 12000 & & & & & **A** \\ PW & M26 & 12001 & & & & & **A B** \\ \hline \end{tabular}
\end{table} 
Table 2: Detections of acoustically tagged Chinook salmon located during survey missions conducted concurrently with an autonomous underwater vehicle (A) and boat (B) in marine waters of Big Port Walter (BPW) and Port Walter (PW), Alaska, during 2016. Bold upper case letters indicate detections made during the same mission that the fish were released; lower case letters indicate detections during subsequent missions. panel), including three fish released at the start of the mission and two fish released the previous day during Mission 22 (black line) and Mission 23 (red line). Several fish were located during successive surveys (Table 2), including Fish 12003 located during missions 21, 22, and 23 (Figure 4, right panel). Best location estimates from the other missions in Big Port Walter (Appendix A) and Port Walter (Appendix B) are also shown. We also compared the best location estimates obtained during the concurrent AUV and vessel-based surveys. Comparable vessel-based estimates were not obtained for all of the AUV locations largely due to differences in the time of detection; a total of 46 paired estimates met the established criteria (i.e., smallest _Resid_ for each methods, time offset <20 min). Movements of the fish based on these estimates are illustrated in Figure 5, including a fish released and located during the same mission (left panel) and one locate during a subsequent mission (right panel). The vessel-based location estimates are represented by numbers that correspond to the sequential order (based on the time of detection) of the paired AUV estimates (e.g., boat estimates designated by 2 and 4 correspond to the second and fourth AUV location estimate obtained during the mission). Paired location estimates for the other missions are shown in Appendices B and C. The time offset for most of the paired estimates (35, 76%) was \(\leq\)5 min (Appendix D), suggesting that although juvenile salmon are relatively mobile, the differences observed between the AUV and vessel-based locations were probably not unduly affected by the movements of the fish. Most (14, 82%) of the fish released in Big Port Walter left the area within 24 h, with the three remaining fish leaving within 48 h. Residency information is not available for the two fish released in Port Walter during the last mission (M26). Estimated dispersal rates were calculated for 14 fish that met the established criteria (Figure 6), yielding a total of 485 pairwise combinations for rate estimate \(\gamma\). The rates ranged from 0.0002 to 1.5040 ms\({}^{-1}\), with a sample mean and standard deviation of \(0.0757\pm 0.1531\) ms\({}^{-1}\). However, these rates exhibited a half-normal distribution with the mode equal to the minimum (essentially 0) and 93% of \(\gamma<0.25\) ms\({}^{-1}\) (Figure 7).