Data and R code for: Rapid numerical but incomplete demographic recovery of Salmo farioides two years after Storm Daniel

Site-level fish density, size-structure, 2025 fish-count, site-coordinate, and environmental and habitat data, together with R code reproducing the statistical analyses and Figures 1–4 for the manuscript “Rapid numerical but incomplete demographic recovery of Salmo farioides two years after Storm Daniel”. Formal repeated-measures analyses compare August 2023, October 2023 and September 2025. June 2023 and June 2025 provide a seasonally matched descriptive comparison for three monitored reaches. The archive includes instructions and reference outputs for checking reproduction of the results.