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High frequency of natural hybrids between Atlantic salmon, Salmo salar L., and brown trout, S. trutta L., in a Swedish river
Authors:H Jansson    I Holmgren    K Wedin  T Anderson
Institution:Salmon Reseurch Institute, S-810 70 Älvkarleby, Sweden
Abstract:Among 332 parr from the Swedish River Grönån examined by electrophoresis, 44 (13%) were hybrids between Atlantic salmon and brown trout. The hybrid frequencies in three sections of Grönån were significantly different (23. 8 and 2%). All hybrids are evidently of natural origin. and possible factors promoting hybridization are irregular overlapping spawning times. lack of separate spawning grounds, and involvement of sneakers.
Keywords:natural hybridization  Atlantic salmon  brown trout
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