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

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

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Date

29/01/2019

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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.

Citation

Hanson , N N , Smith , G W , Middlemas , S J & Todd , C D 2019 , ' Precision and accuracy of Dahl-Lea back-calculated smolt lengths from adult scales of Atlantic salmon ( Salmo salar L. ) ' , Journal of Fish Biology , vol. 94 , no. 1 , pp. 183-186 . https://doi.org/10.1111/jfb.13863

Publication

Journal of Fish Biology

Status

Peer reviewed

DOI

https://doi.org/10.1111/jfb.13863

ISSN

0022-1112

Type

Journal article

Rights

Copyright © 2018, Crown copyright. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1111/jfb.13863

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University of St Andrews Research

URI

http://hdl.handle.net/10023/18930