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

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...

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Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Hanson, Nora N, Smith, Gordon W, Middlemas, Stewart J, Todd, Christopher David
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Allometry
Back-calculation
Circuli
Growth
Increment analysis
Salmo salar
Atlantic salmon
Online Access:https://research-portal.st-andrews.ac.uk/en/publications/13667299-42f5-4d76-8aee-c5adac2b9042
https://doi.org/10.1111/jfb.13863
https://research-repository.st-andrews.ac.uk/bitstream/10023/18930/1/Hanson_et_al_2018_Journal_of_Fish_Biology_AAM.pdf
Description
Summary: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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