Detection of frozen-thawed salmon (Salmo salar) by a rapid low-cost method

► Impedance spectroscopy was employed to differentiate fresh and frozen-thawed salmon. ► Freezing, storage time or number of cycles only affected water holding capacity. ► Impedance spectroscopy was unable to discriminate storage time under frozen conditions. ► Impedance spectroscopy could be a useful to detect fish submitted to freezing process.