Guide to the interpretation of the scales and the estimation of the age of brown trout (Salmo trutta) from the French populations
Three biological forms of brown trout, river, lake and sea, have colonised a large number of aquatic environments in France, owing to a high ecological plasticity of the species. The overall objective of this guide is to serve as a user manual for interpreting the scales and estimating the age of brown trout (Salmo trutta) from the French trout populations.
Contents
- Presentation of the species, its range, life-history strategies and studied populations
- Description of the morphology and structure of trout scales
- Scale reading
- Identification and definition of the observed scale structures
- Age estimation
- Examples of typical scales
- Using scales to distinguish brown trout from Atlantic salmon
- Difficulties encountered, proposed solutions and recommendations
Keywords: Brown trout - Sea trout - Lake trout - Salmo trutta - Scale - Scale reading - Hard structure - Age estimation - France
Guide pour l'interprétation des écailles et l'estimation de l'âge chez la truite commune (Salmo trutta) dans les populations françaises
| Guides and protocols
| February 2020
Cette espèce a la particularité de coloniser de très nombreux cours d'eau en France sous 3 formes biologiques, rivière, lac et mer, en raison de sa grande plasticité écologique.
Objectif général du guide : fournir un manuel d'utilisation et d'interprétation des écailles pour l'estimation de l'âge chez la truite commune (Salmo trutta) des populations françaises.
