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

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Author(s)

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

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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.

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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

    Research areas

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

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