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Back-calculation techniques are an important tool in studies of fish growth and how it varies in time and space. Correct specification of the back-calculation model is important for interpretation of temporal patterns in fish growth, to account for variation arising from changes in the relationship between calcified structures and fish body length, for example through time or among populations. We used Atlantic salmon scales from a mark-recapture experiment between 1953 and 1999, to evaluate alternative back-calculation models using model selection criteria. In particular, three hypotheses were investigated i) whether different populations of Atlantic salmon share the same scale-body length relationship ii) whether the same or separate scale-body length relationships apply during the freshwater and marine phases iii) whether accounting for the number of sea winters and season of recapture can improve back-calculations. Our results demonstrate that back-calculation should be performed at the river-stock level where possible. Based on model selection criterion, we found highest support for a model that accounted for the effects of life stage (freshwater or marine), sea winter age and season of capture.

Nyckelord

Back-calculation; Atlantic salmon; Model selection; Hierarchical Bayesian model

Publicerad i

Fisheries Research
2025, volym: 289, artikelnummer: 107497
Utgivare: ELSEVIER

SLU författare

UKÄ forskningsämne

Fisk- och akvakulturforskning

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.fishres.2025.107497

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/144388