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Table 1 Sampling schedule with data on lost tags and body size

From: Long-term PIT tag retention rates in Atlantic salmon (Salmo salar)

Handling Date N total N lost R (%) Ltotal (mm) Llost (mm) DL (mm) p Life stage
Tagging 05.04.2016 2986    163.2 ± 19.6     Pre-smolt (fw)
First sampling 24.05.2016 2908 35 98.80 185.6 ± 20.3 177.1 ± 27.9 − 8.5 ± 3.5 < 0.05 Smolt (sw)
Second sampling 04.07.2016 2721a 7a 99.78 207.0 ± 22.1 202.4 ± 8.8 − 4.6 ± 3.5 n.s. Postsmolt (sw)
Third sampling 25.09.2016 2643 3 99.89 272.3 ± 28.0 279.3 ± 3.7 7.0 ± 16.2 n.s. Postsmolt/adult (sw)
Fourth sampling 29.03.2017 2533 99 96.09 373.0 ± 36.7 379.5 ± 29.9 6.5 ± 3.7 n.s. Adult (sw)
Fifth sampling 20.09.2017 1286b 47b 96.50 449.7 ± 41.4 445.1 ± 41.6 − 4.6 ± 6.2 n.s. Adult (sw)
  1. Total number of fish (Ntotal), number of fish without PIT tag (Nlost), proportion of fish with tag (R), fork length (average ± SD) of all fish (Ltotal) and fish without tag (Llost), and estimated difference in length (DL; average ± SE) followed by the test result (p). Freshwater (fw) and saltwater (sw) indicated for the life stages
  2. aIncludes one individual with lost tag from the previous sampling
  3. bIncludes two individuals with lost tag from the previous sampling