dc.contributor.author | Strand, Jo Espen Tau | |
dc.contributor.author | Hazlerigg, David | |
dc.contributor.author | Jørgensen, Even Hjalmar | |
dc.date.accessioned | 2018-10-29T15:36:22Z | |
dc.date.available | 2018-10-29T15:36:22Z | |
dc.date.issued | 2018-07-26 | |
dc.description.abstract | The present study investigated whether there is a critical length of photoperiod needed to stimulate a completed parr–smolt transformation (PST) in Atlantic salmon <i>Salmo salar</i>. In two experiments, <i>S. salar</i> parr of the Norwegian aquaculture strain held on continuous light were exposed to a short photoperiod (6 L:18D) followed by exposure to 8 L:16D, 12 L:12D, 16 L:8D, 20 L:4D and 24 L:0D in experiment 1 or to 6 L:18D followed by maintenance on 6 L:18D or exposure to 12 L:12D and 24 L:0D photoperiods in experiment 2. All groups, irrespective of photoperiod treatment, developed improved hypo‐osmoregulatory ability. However, the development was greatest in the groups exposed to 20 L:4D and 24 L:0D in experiment 1 and 24 L:0D in experiment 2. In experiment 2, gill Na+– K+‐ATPase activity increased in the group exposed to 24 L:0D, but not in the groups exposed to 12 L:12D and 6 L:18D. The groups exposed to 20 L:4D and 24 L:0D in experiment 1 and 24 L:0D in experiment 2 also grew better than fish exposed to shorter photoperiods. In experiment 2 only the group exposed to 24 L:0D showed a decrease in condition factor and increases in plasma growth hormone and brain type 2 deiodinase mRNA abundance. Hence, only the groups exposed to photoperiods above 16 L:8D developed classical smolt indices in the present experiment, leading us to conclude that the photoperiod increase needs to exceed 16 h daylight for stimulating a complete PST in the <i>S. salar</i> used in the present study. | en_US |
dc.description.sponsorship | UiT the Arctic University of Norway, Tromsø | en_US |
dc.description | This is the peer reviewed version of the following article: Strand, J.E.T., Hazlerigg, D., Jørgensen, E.H. (2018). Photoperiod revisited: is there a critical day length for triggering a complete parr–smolt transformation in Atlantic salmon Salmo salar? Journal of Fish Biology, 93, 440-480. https://doi.org/10.1111/jfb.13760, which has been published in final form at <a href=https://doi.org/10.1111/jfb.13760> https://doi.org/10.1111/jfb.13760</a>. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | en_US |
dc.identifier.citation | Strand, J.E.T., Hazlerigg, D. & Jørgensen, E.H. (2018). Photoperiod revisited: is there a critical day length for triggering a complete parr–smolt transformation in Atlantic salmon Salmo salar? Journal of Fish Biology, 93, 440-480. https://doi.org/10.1111/jfb.13760 | en_US |
dc.identifier.cristinID | FRIDAID 1610083 | |
dc.identifier.doi | 10.1111/jfb.13760 | |
dc.identifier.issn | 0022-1112 | |
dc.identifier.issn | 1095-8649 | |
dc.identifier.uri | https://hdl.handle.net/10037/14053 | |
dc.language.iso | eng | en_US |
dc.publisher | Wiley | en_US |
dc.relation.journal | Journal of Fish Biology | |
dc.rights.accessRights | openAccess | en_US |
dc.subject | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 | en_US |
dc.subject | VDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920 | en_US |
dc.subject | day length | en_US |
dc.subject | photoperiod | en_US |
dc.subject | Salmo salar | en_US |
dc.subject | salmon smolt | en_US |
dc.title | Photoperiod revisited: is there a critical day length for triggering a complete parr–smolt transformation in Atlantic salmon Salmo salar? | en_US |
dc.type | Journal article | en_US |
dc.type | Tidsskriftartikkel | en_US |
dc.type | Peer reviewed | en_US |