Precision and accuracy of Dahl‐Lea back‐calculated smolt lengths from adult scales of Atlantic salmon Salmo salar

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, Stuart J., Todd, Christopher D.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2018
Subjects:
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Atlantic salmon
Salmo salar
Online Access:http://dx.doi.org/10.1111/jfb.13863
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.13863
https://onlinelibrary.wiley.com/doi/pdf/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 = 0.53 x + 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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