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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
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Animal Biotelemetry

ISSN: 2050-3385