{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T06:58:06Z","timestamp":1774940286144,"version":"3.50.1"},"reference-count":66,"publisher":"The Company of Biologists","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Growth hormone (GH) transgenic Atlantic salmon display accelerated growth rates compared to non-transgenics. GH-transgenic fish also display cardiorespiratory and metabolic modifications that accompany the increased growth rate. An elevated routine metabolism has been described for pre- and post-smolt GH-transgenic salmon that also display improvements in oxygen delivery to support the increased aerobic demand. The early ontogenic effects of GH-transgenesis on the respiratory and cellular physiology of fish, especially during adverse environmental conditions and the effect of polyploidy, are unclear. Here, we investigated the effects of GH-transgenesis and polyploidy on metabolic, heart and ventilation rates and heat shock protein (HSP) levels, after exposure to acute hypoxia in post-hatch Atlantic salmon yolk-sac alevins. Metabolic rate decreased with decreasing partial pressures of oxygen in all genotypes. In normoxia, triploid transgenics displayed the highest mass specific metabolic rates in comparison to diploid transgenics and non-transgenic triploids, which in contrast had higher rates than diploid non-transgenics. In hypoxia, we observed a lower mass-specific metabolic rate in diploid non-transgenics compared to all other genotypes. However, no evidence for improved O2 uptake through heart or ventilation rate was found. Heart rate decreased in diploid non-transgenics while ventilation rate decreased in both diploid non-transgenics and triploid transgenics in severe hypoxia. Regardless of genotype or treatment, inducible HSP70 was not expressed in alevins. Following hypoxia, the constitutive isoform of HSP70, HSC70 decreased in transgenics and HSP90 expression decreased in all genotypes. These data suggest that physiological changes through GH-transgenesis and polyploidy are manifested during early ontogeny in Atlantic salmon.<\/jats:p>","DOI":"10.1242\/jeb.098913","type":"journal-article","created":{"date-parts":[[2014,3,28]],"date-time":"2014-03-28T08:18:27Z","timestamp":1395994707000},"source":"Crossref","is-referenced-by-count":9,"title":["Growth hormone transgenesis and polyploidy increase metabolic rate, alter the cardiorespiratory response and influence HSP expression to acute hypoxia in Atlantic salmon (<i>Salmo salar<\/i>) yolk-sac alevins"],"prefix":"10.1242","author":[{"given":"Elias T.","family":"Polymeropoulos","sequence":"first","affiliation":[{"name":"Commonwealth Scientific and Industrial Research Organisation, Australia;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debbie","family":"Plouffe","sequence":"additional","affiliation":[{"name":"Aquabounty Farms, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sacha","family":"LeBlanc","sequence":"additional","affiliation":[{"name":"Mount Allison University, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Suzie","family":"Currie","sequence":"additional","affiliation":[{"name":"Mount Allison University, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nick G.","family":"Elliott","sequence":"additional","affiliation":[{"name":"Commonwealth Scientific and Industrial Research Organisation, Australia;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter B.","family":"Frappell","sequence":"additional","affiliation":[{"name":"University of Tasmania, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"237","published-online":{"date-parts":[[2014,1,1]]},"reference":[{"key":"2021042507322033300_R1","doi-asserted-by":"crossref","first-page":"2393","DOI":"10.1242\/jeb.198.11.2393","article-title":"Effect of hemoglobin concentration on the oxygen-affinity of intact lamprey erythrocytes","volume":"198","author":"Airaksinen","year":"1995","journal-title":"J. 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