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Unfortunately, incidence of jacking has increased linked to intensive rearing conditions. This study subjected 1000 salmon (52.1\u2009\u00b1\u20095.2\u2009g) to one of two temperatures (15, 12.5\u00b0C) and one of two photoperiods (constant light\u2010LL, a 5\u2010week LD12:12 winter signal regime\u2010WS) to assess their effects on spermatogenesis regulation. Indicators included testis histology images, mRNA transcription of gonadotropin receptors for follicle\u2010stimulating hormone (<jats:italic>fshr<\/jats:italic>) and luteinizing hormone (<jats:italic>lhr<\/jats:italic>), and of factors regulating spermatogenesis like anti\u2010M\u00fcllerian hormone (<jats:italic>amh<\/jats:italic>), gonadal\u2010soma\u2010derived factors 1 and 2 (<jats:italic>gsdf1<\/jats:italic> and <jats:italic>gsdf2<\/jats:italic>), and insulin\u2010like growth factor\u20103 (<jats:italic>igf3<\/jats:italic>). High temperature (15\u00b0C) induced early testis development processes irrespective of photoperiod, evidenced by presence of type B spermatogonia before clear increases in testis size or any transcriptional changes. The winter signal at 15\u00b0C caused a synchronized onset of spermatogenesis not present under constant light. This was evidenced by a pronounced downregulation of the spermatogenesis\u2010inhibiting factor <jats:italic>amh<\/jats:italic> and a clear upregulation in the stimulating factor <jats:italic>igf3<\/jats:italic>. Consequently, combining high temperatures with winter signal regimes pose risk; high temperature can stimulate early cellular\/endocrine processes of spermatogenesis, which can later be synchronized in the population by an increase in daylength.<\/jats:p>","DOI":"10.1111\/jwas.13090","type":"journal-article","created":{"date-parts":[[2024,7,13]],"date-time":"2024-07-13T06:25:30Z","timestamp":1720851930000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Elevated water temperature in combination with an increase in daylength stimulate a synchronized onset of spermatogenesis in male Atlantic salmon (<i>Salmo salar<\/i>, L.) postsmolts"],"prefix":"10.1111","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5202-5144","authenticated-orcid":false,"given":"Enrique","family":"Pino\u2010Martinez","sequence":"first","affiliation":[{"name":"Department of Biological Sciences University of Bergen, High Technology Centre  Bergen Norway"}]},{"given":"Kari Anne","family":"Kamlund","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Bergen, High Technology Centre  Bergen Norway"}]},{"given":"Pablo","family":"Balseiro","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Bergen, High Technology Centre  Bergen Norway"}]},{"given":"Marianne","family":"Kraugerud","sequence":"additional","affiliation":[{"name":"Pharmaq Analytiq  Oslo Norway"}]},{"given":"Albert Kjartan Dagbjartarson","family":"Imsland","sequence":"additional","affiliation":[{"name":"Akvaplan\u2010Niva, Iceland Office  K\u00f3pavogur Iceland"}]},{"given":"Sigurd O.","family":"Handeland","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences University of Bergen, High Technology Centre  Bergen Norway"}]}],"member":"311","published-online":{"date-parts":[[2024,7,12]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0044-8486(01)00583-X"},{"key":"e_1_2_9_3_1","unstructured":"Christensen R. 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