Estimation of the age and reproductive performance of wild-born and escaped mink (Neovison vison) caught in the wild in Denmark

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  • Sussie Pagh, Aalborg University
  • ,
  • Cino Pertoldi, Aalborg University, Aalborg Zoo
  • ,
  • Mariann Chriel, Technical University of Denmark
  • ,
  • Heidi Huus Petersen, Technical University of Denmark
  • ,
  • Trine Hammer Jensen, Aalborg University, Aalborg Zoo
  • ,
  • Sussi Madsen
  • David Chr Evar Kraft
  • Toke Munk Schou, Aalborg University
  • ,
  • Mette Sif Hansen, University of Copenhagen, Denmark

The feral mink population in Denmark consists of two groups of animals: mink born in the wild and mink that have recently escaped from farms. The aims of this study were to: (1) estimate the reproductive performance and mortality of the Danish mink born in the wild (wild-born) and mink escaped from farms (captive-born); (2) discuss the likelihood of a self-sustaining population of wild-born mink in Denmark; and (3) model the relationship between the pulp cavity width and the age of mink. During 2018, 247 wild caught mink were sent for necropsy at the Danish National Veterinary Institute. Based on body length, 112 were determined as captive-born and 96 as wild-born. The mean litter size ± SE of wild-born females was 7.6 ± 0.9 (range: 5–11 kits) and for captive-born females 5.9 ± 0.9 (range: 1–10 kits). The relationship between age (in months) of mink and pulp cavity width was highly significant. Individuals with a pulp cavity width of >35% were younger than one year. Based on fecundity, the turnover of the mink population was estimated to be 66%, and the yearly mortality was estimated at 69%. Hence, the population is slightly declining. In conclusion, a feral reproducing mink population in Denmark persists without a continuous influx of captive-born mink from farms.

Original languageEnglish
Article number162
Number of pages11
Publication statusPublished - Jan 2021

    Research areas

  • Demography, Fecundity, Litter size, Placental scars, Turnover

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