Extent of predation bias present in migration survival and timing of Atlantic salmon smolt (Salmo salar) as suggested by a novel acoustic tag

Table 1 Count of predator tagged smolts detected for both the biased and clean groups detection histories at successive acoustic receiver arrays

Location	Tags detected (%)		Inferred mean cumulative survival		Maximum migration time to array (day)		Minimum migration time to array (day)
Array (km)	Biased group	Clean group	Group mean difference	KDE shift	Group mean difference	KDE shift	Group mean difference	KDE shift
66	41 (82)	36 (72)	0.093	0.566	0.558	0.112	0.007	0.021
54	30 (60)	24 (48)	0.115	0.588	0.412	0.095	0.175	0.048
44	17 (34)	15 (30)	0.062	0.351	0.432	0.146	0.074	0.047
37	16 (32)	13 (26)	0.059	0.370	0.182	0.098	0.019	0.042
27	12 (24)	11 (22)	0.022	0.166	0.180	0.097	0.078	0.058

The extent of bias present in migration timing and apparent survival at successive acoustic receiver arrays are presented as the difference in means and the proportion of the joint kernel density estimate (KDE) areas for both groups that does not overlap

ISSN: 2050-3385