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
Other Authors: University of St Andrews. School of Biology, University of St Andrews. Marine Alliance for Science & Technology Scotland, University of St Andrews. Scottish Oceans Institute
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Allometry
Back-calculation
Circuli
Growth
Increment analysis
Salmo salar
QH301 Biology
SH Aquaculture. Fisheries. Angling
NDAS
QH301
SH
Atlantic salmon
Online Access:http://hdl.handle.net/10023/18930
https://doi.org/10.1111/jfb.13863
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. Postprint Peer reviewed

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