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

doi:10.1111/jfb.13863

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 journal › Article › peer-review

9 Citations (Scopus)

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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.

Original language	English
Pages (from-to)	183-186
Journal	Journal of Fish Biology
Volume	94
Issue number	1
Early online date	27 Dec 2018
DOIs	https://doi.org/10.1111/jfb.13863
Publication status	Published - 29 Jan 2019

Keywords

Allometry
Back-calculation
Circuli
Growth
Increment analysis
Salmo salar

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10.1111/jfb.13863

Hanson-et-al-2018-Journal-of-Fish-Biology-AAM
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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Cite this

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

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. ",

keywords = "Allometry, Back-calculation, Circuli, Growth, Increment analysis, Salmo salar",

author = "Hanson, {Nora N} and Smith, {Gordon W} and Middlemas, {Stewart J} and Todd, {Christopher David}",

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AU - Smith, Gordon W

AU - Middlemas, Stewart J

AU - Todd, Christopher David

PY - 2019/1/29

Y1 - 2019/1/29

N2 - 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.

AB - 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.

KW - Allometry

KW - Back-calculation

KW - Circuli

KW - Growth

KW - Increment analysis

KW - Salmo salar

U2 - 10.1111/jfb.13863

DO - 10.1111/jfb.13863

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JF - Journal of Fish Biology

IS - 1

ER -

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

Abstract

Keywords

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