Abstract
Morphological characters were compared between smolts (standard length 110–220 mm) of Atlantic salmon Salmo salar L., anadromous brown trout Salmo trutta L. and their hybrids captured in River Driva, western Norway. Morphological discrimination between S. salar, S. trutta and their hybrids was correct for 93% of the individuals (correct form was determined genetically). Morphological discrimination of hybrids was incorrect with 9.1% (n = 7) classified as S. salar and 1.3% (n = 1) as S. trutta, suggesting that the hybrids were morphologically more similar to S. salar than S. trutta despite a bias towards S. trutta mothers (7 of 8 cases). The largest morphological differences were found in head (notably maxilla length) and caudal peduncle morphology. Hybrids between S. salar and S. trutta had the longest pectoral and pelvic fins. This indicates that precise discrimination based on morphological traits can be made between S. salar, S. trutta and their hybrids.
Original language | English |
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Pages (from-to) | 357-365 |
Number of pages | 8 |
Journal | Fisheries Management and Ecology |
Volume | 21 |
Issue number | 5 |
DOIs | |
Publication status | Published - Oct 2014 |
Keywords
- escaped farm salmon
- Gyrodactylus salaries
- hybridisation
- morphological discrimination
- reproductive isolation
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Eric Verspoor
- UHI Inverness - Associate Professor
- Aquaculture Research Network
- Institute for Biodiversity and Freshwater Conservation
Person: Academic - Research and Teaching or Research only