Precision and accuracy of Dahl-Lea back-calculated smolt lengths from adult scales of Atlantic salmon (Salmo salar L.)

Nora N Hanson, Gordon W Smith, Stewart J Middlemas, Christopher David Todd

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
9 Downloads (Pure)

Abstract

Using tagged and recaptured Atlantic salmon Salmo salar (n = 106) the present analysis shows that the most commonly applied linear back-calculation method for estimating past length, the Dahl-Lea method, resulted in overestimation of the length of large smolts and underestimation of small smolts.  A correction equation (y = 0.53x + 6.23) for estimating true smolt length (y) from lengths back-calculated from adult scale measures (x) to account for these systematic discrepancies is proposed.

Original languageEnglish
Pages (from-to)183-186
JournalJournal of Fish Biology
Volume94
Issue number1
Early online date27 Dec 2018
DOIs
Publication statusPublished - 29 Jan 2019

Keywords

  • Allometry
  • Back-calculation
  • Circuli
  • Growth
  • Increment analysis
  • Salmo salar

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