Changes in length-at-first return of a sea trout (Salmo trutta) population in northern France
Quentin Josset,
Laurent Beaulaton,
Atso Romakkaniemi
et al.
Abstract:The resilience of sea trout populations is increasingly concerning, with evidence of major demographic changes in some populations. Based on trapping data and related scale collec-tion, we analysed long-term changes in body length of a sea trout population in the Bresle River, France. From 1984-2022, the length of first-time returning individuals decreased by 1.18 mm.year-1 (SD = 0.03), which resulted in the loss ofc.8% of mean body length. This decrease results from a decrease in the age at first return, with… Show more
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