Variation in skin barrier function throughout smoltification in Atlantic salmon (Salmo salar)

Introduction Smoltification involves distinct morphological, physiological and behavioral changes in Atlantic salmon, yet skin barrier function has not been functionally assessed throughout this transition. Method We measured electrophysiological parameters at three life stages — parr, smolt, and post-smolt — to assess changes in skin permeability and transport capacity. Results Parr skin showed significantly lower transepithelial resistance (higher permeability) and more negative short-circuit