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Initially, eggs from a farmed Atlantic salmon <jats:italic>Salmo salar<\/jats:italic> were crossed with the sperm from a <jats:italic>S. salar<\/jats:italic>, arctic char <jats:italic>Salvelinus alpinus<\/jats:italic> or brown trout <jats:italic>Salmo trutta<\/jats:italic>. For <jats:italic>S. salar<\/jats:italic> \u00d7 <jats:italic>S. trutta<\/jats:italic>, half the eggs were triploidised. In a second\u2010 and third\u2010year class, the eggs from a farmed <jats:italic>S. salar<\/jats:italic> were crossed with the sperm from either a <jats:italic>S. salar<\/jats:italic> or a <jats:italic>S. trutta<\/jats:italic>, and half of each group was triploidised. In the two initial\u2010year classes, all hybrids were larger than the <jats:italic>S. salar<\/jats:italic> controls, and triploid <jats:italic>S. salar<\/jats:italic> \u00d7 <jats:italic>S. trutta<\/jats:italic> were larger than diploid counterparts. In the third\u2010year class, the <jats:italic>S. salar<\/jats:italic> \u00d7 <jats:italic>S. trutta<\/jats:italic> were smaller than the <jats:italic>S. salar<\/jats:italic>, in contrast to the initial 2 year classes, although the triploid hybrids were still larger than the diploids. In the third\u2010year class, a high degree of spontaneous triploidy was also observed in the putative diploid groups (between 16 and 39%). Vertebral deformities were consistently higher in pressure\u2010shocked triploids than diploids, irrespective of hybridisation, but there was no consistent effect of hybridisation among experiments. Although this study was not able to explain the contrasting results for vertebral deformities between year classes, triploid <jats:italic>S. salar<\/jats:italic> \u00d7 <jats:italic>S. trutta<\/jats:italic> can demonstrate impressive freshwater growth that could be of interest for future farming programmes.<\/jats:p>","DOI":"10.1111\/jfb.14353","type":"journal-article","created":{"date-parts":[[2020,4,20]],"date-time":"2020-04-20T08:03:25Z","timestamp":1587369805000},"page":"1059-1070","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Vertebral deformities in interspecific diploid and triploid salmonid hybrids"],"prefix":"10.1111","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2107-5242","authenticated-orcid":false,"given":"Thomas W. 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