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

Table 4 Summary of predation classifications from simple rule-based filter: number of tags first flagged as predated at telemetry stations in region because of meeting filter category

Region (station codes)	Filter category
Region (station codes)	Long upstream transition	Fast upstream transition	Transition against flow	Low distance per day	Long residence time	Total^a
Upstream of Mossdale (A1–A5)	0	0	5	6	1	12
Mossdale through head of Old River (A6–A8/B1)	0	0	7	0	32	39
Undine Road to Howard Road (A9–A13)	0	0	14	0	17	31
Weston Ranch to Navy Bridge/Rough and Ready Island (A14–A17/R1)	0	0	1	0	4	4
Calaveras River to Turner Cut Junction (A18–A20/T1)	0	0	0	0	7	7
Head of Middle River (B2, C1)	0	0	0	0	0	0
Total	0	0	27	6	61	93

Tags predated between stations or regions were included in the count at neighboring stations. See text for more precise definitions of filter categories. Telemetry stations are identified in Fig. 1 and Table 1
^aTotal may be greater than row total because a single detection event may violate multiple rules

ISSN: 2050-3385