Morphological and genetic comparison between naturally produced smolts of Atlantic salmon,brown trout and their hybrids |
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| Authors: | Ø Solem O K Berg E Verspoor K Hindar S O Karlsson J Koksvik L Rønning G Kjærstad J V Arnekleiv |
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| Institution: | 1. Department of Biology, Realfagbygget, Norwegian University of Science and Technology NTNU, , Trondheim, Norway;2. Rivers and Lochs Institute, Inverness College University of the Highlands and Islands, , Inverness, UK;3. Norwegian Institute for Nature Research (NINA), , Trondheim, Norway;4. Museum of Natural History and Archaeology, Norwegian University of Science and Technology NTNU, , Trondheim, Norway |
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| 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. |
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| Keywords: | escaped farm salmon
Gyrodactylus salaries
hybridisation morphological discrimination reproductive isolation |
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