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Table 2 Summary of tag detections at key locations and output of rule-based (RB) and pattern-recognition (PR) predator filters for 2016 San Joaquin Chinook salmon case study

From: Diagnosing predated tags in telemetry survival studies of migratory fishes in river systems

Statistic No filter Simple RB filter Complex RB filter Smolt-only PR filter Multispecies PR filter
Number of tags released (A0) 648 648 648 648 648
Total number of tags classified in predator 0 93 (14%) 139 (21%) 66 (10%) 89 (14%)
Total number of detection events classified in predator   314 (8%) 396 (10%) 324 (8%) 386 (9%)
Number of first-time predator classifications      
 Upstream of Mossdale (A1–A5)   12 17 5 19
 Mossdale through head of Old River (A6–A8/B1)   39 67 15 20
 Undine Road to Howard Road (A9–A13)   30 37 25 28
 Weston Ranch to Navy Bridge/Rough and Ready Island (A14–A17/R1)   5 9 19 20
 Calaveras River to Turner Cut Junction (A18–A20/T1)   7 8 2 2
 Head of Middle River (B2, C1)   0 1 0 0
Number of total tag detectionsa:      
 Banta Carbona (A5) 470 467 467 470 465
 Mossdale (A6) 416 415 415 416 415
 Lathrop (A8) 250 249 246 249 247
 Old River East (B1) 32 32 32 32 32
 Brandt Bridge (A12) 108 106 105 104 99
 Garwood Bridge (A16) 79 78 77 63 63
 Turner Cut Junction (A20/T1) 26 24 26 20 20
  1. Only detections in core area or occurring before detections in core area were included. Core area: stations A2–A20, B1, R1, and T1, omits stations A1, B2, and C1 (Fig. 1)
  2. aTag detection counts at all stations are shown in Tag Predation Additional file 1: Table S4