The aim of the study was to determine selenium concentration in the liver, kidneys and spleen of ranch mink (Mustela vison) (n = 25). Selenium concentration in samples was determined spectrofluorimetrically using 2,3-diaminonaphtalene (DAN). Concentration of Se in the liver, kidneys and spleen averaged 0.38 ± 0.09, 1.18 ± 0.21 and 0.30 ± 0.07 μg · g^–1 wet weight, respectively. Kidney Se concentration was significantly (P < 0.05) higher than in liver and spleen. In view of scarce literature data concerning selenium content in farmed mink organs and no reference values it is difficult to conclude whether the Se levels obtained fall within the optimum range for these animals. Higher Se concentration in kidney than liver may indicate selenium deficiency. It seems necessary to continue research in order to establish reference values for this species.

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