Section 8
Chapter 7,254

Effect of mink mustela vison schreber predation on cohorts of juvenile atlantic salmon salmo salar l. and brown trout salmo trutta l. in three small streams

Heggenes, J.; Borgstrom, R.

Journal of Fish Biology 33(6): 885-894


ISSN/ISBN: 0022-1112
Accession: 007253669

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Two cohorts of Atlantic salmon parr and one of brown trout were studied in periods with and without the presence of mink, Mustela vison. In all localities a marked increase in mortality rate was observed during periods when mink were present. Mink were observed catching salmon parr, and approximately 10% of the parr had bite marks, especially on the tail fins. In the smallest stream with brown trout, the mortality rate was 0.80 during a few days with mink present; remnants of trout were found along the stream. The present study suggests than mink predation may be a major cause of mortality of salmonids in small streams. The results indicate that predation efficiency may vary with characteristics of the habitat, especially stream width and discharge, and fish density.

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