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Table 2 Number, size and tag burdens of subyearling and yearling Chinook salmon tagged with either a PIT tag or with a PIT tag and an acoustic tag (AT Fish) and released at Lower Granite Dam across three years

From: Survival of seaward-migrating PIT and acoustic-tagged juvenile Chinook salmon in the Snake and Columbia Rivers: an evaluation of length-specific tagging effects

  

Sample size

  

Stock

Year

PIT

AT

Fork length range (mm)

Median (range) AT tag burden (%)

Yearling

2006

19,111

898

120–149

3.2 (2.2–5.0)

 

2007

49,167

3,755

110–159

3.6 (2.0–7.4)

 

2008

53,592

4,087

100–159

2.3 (1.2–7.4)

Subyearlinga

2007

35,793

9,760

80–129

6.3 (2.5–15.1)

  1. aSurvival estimates from release to LMN were not produced for subyearling Chinook salmon ranging in fork length from 80 mm to 89 mm or 120 mm to 129 mm due to low PIT detection probabilities for these length-classes, causing unreliable estimates. Sample sizes to LMN were thus 32,904 (PIT) and 8,641 (AT).
  2. AT acoustic transmitter, PIT passive integrated transponder.
  3. Fork length indicates the range of fish sizes included in the analysis for a given year and stock. Tag burdens were calculated as weight of fish/weight of tag (PIT + AT tag weights).
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Animal Biotelemetry

ISSN: 2050-3385