A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar )
Four groups of Atlantic salmon fry (n = 2000) were exposed to continuous light (LD24 : 0) from first feeding on 18th April 2001, after which they were exposed to either an 8 or 12 week period of short days (LD10 : 14) starting on either the 21st May or the 18th June. Each group was then returned to...
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ftunivtasecite:oai:ecite.utas.edu.au:42026 2023-05-15T15:32:00+02:00 A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) Berrill, IK Smart, A Porter, MJR Bromage, NR 2006 https://doi.org/10.1016/j.aquaculture.2005.10.036 http://ecite.utas.edu.au/42026 en eng Elsevier BV http://dx.doi.org/10.1016/j.aquaculture.2005.10.036 Berrill, IK and Smart, A and Porter, MJR and Bromage, NR, A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ), Aquaculture, 254, (1-4) pp. 625-636. ISSN 0044-8486 (2006) [Refereed Article] http://ecite.utas.edu.au/42026 Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture Refereed Article PeerReviewed 2006 ftunivtasecite https://doi.org/10.1016/j.aquaculture.2005.10.036 2019-12-13T21:18:40Z Four groups of Atlantic salmon fry (n = 2000) were exposed to continuous light (LD24 : 0) from first feeding on 18th April 2001, after which they were exposed to either an 8 or 12 week period of short days (LD10 : 14) starting on either the 21st May or the 18th June. Each group was then returned to LD24 : 0 until the conclusion of the experiment the following March. In August 200 fish per treatment were individually PIT tagged. All groups were maintained under an ambient temperature regime. The highest levels of sexual maturation in 0+ male parr were recorded in the 12 week/May group (> 11% of the entire male and female population), with the lowest levels (< 1%) in the 12 week/June treatment and intermediate levels (> 6%) in the 8 week/May and 8 week/June groups (P < 0.05). Between mid August and late October mature parr were heavier than their immature counterparts, but subsequently both cohorts maintained similar sizes. Fish showing signs of silvering were found from mid October onwards. However, it was only in the 12 week/June group that silvered fish had a significantly reduced condition factor and an increased gill Na+, K+-ATPase activity, indicative of smoltification. At the conclusion of the experiment, fish showing signs of silvering were most prevalent (30%) in the 12 week/June group. It is concluded that the initiation of maturation can be influenced by an 8 or 12 week period of short days (LD10 : 14) applied from mid May or mid June in the first growing season. The duration and timing of a stimulatory short day photoperiod during early development may also influence whether a fish undergoes smoltification in the coming year or whether it delays the parr-smolt transformation for at least a further year. 2005 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Atlantic salmon Salmo salar eCite UTAS (University of Tasmania) Aquaculture 254 1-4 625 636 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture |
spellingShingle |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture Berrill, IK Smart, A Porter, MJR Bromage, NR A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
topic_facet |
Agricultural and Veterinary Sciences Fisheries Sciences Aquaculture |
description |
Four groups of Atlantic salmon fry (n = 2000) were exposed to continuous light (LD24 : 0) from first feeding on 18th April 2001, after which they were exposed to either an 8 or 12 week period of short days (LD10 : 14) starting on either the 21st May or the 18th June. Each group was then returned to LD24 : 0 until the conclusion of the experiment the following March. In August 200 fish per treatment were individually PIT tagged. All groups were maintained under an ambient temperature regime. The highest levels of sexual maturation in 0+ male parr were recorded in the 12 week/May group (> 11% of the entire male and female population), with the lowest levels (< 1%) in the 12 week/June treatment and intermediate levels (> 6%) in the 8 week/May and 8 week/June groups (P < 0.05). Between mid August and late October mature parr were heavier than their immature counterparts, but subsequently both cohorts maintained similar sizes. Fish showing signs of silvering were found from mid October onwards. However, it was only in the 12 week/June group that silvered fish had a significantly reduced condition factor and an increased gill Na+, K+-ATPase activity, indicative of smoltification. At the conclusion of the experiment, fish showing signs of silvering were most prevalent (30%) in the 12 week/June group. It is concluded that the initiation of maturation can be influenced by an 8 or 12 week period of short days (LD10 : 14) applied from mid May or mid June in the first growing season. The duration and timing of a stimulatory short day photoperiod during early development may also influence whether a fish undergoes smoltification in the coming year or whether it delays the parr-smolt transformation for at least a further year. 2005 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Berrill, IK Smart, A Porter, MJR Bromage, NR |
author_facet |
Berrill, IK Smart, A Porter, MJR Bromage, NR |
author_sort |
Berrill, IK |
title |
A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
title_short |
A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
title_full |
A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
title_fullStr |
A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
title_full_unstemmed |
A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ) |
title_sort |
decrease in photoperiod shortly after first feeding influences the development of atlantic salmon ( salmo salar ) |
publisher |
Elsevier BV |
publishDate |
2006 |
url |
https://doi.org/10.1016/j.aquaculture.2005.10.036 http://ecite.utas.edu.au/42026 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://dx.doi.org/10.1016/j.aquaculture.2005.10.036 Berrill, IK and Smart, A and Porter, MJR and Bromage, NR, A decrease in photoperiod shortly after first feeding influences the development of Atlantic salmon ( Salmo salar ), Aquaculture, 254, (1-4) pp. 625-636. ISSN 0044-8486 (2006) [Refereed Article] http://ecite.utas.edu.au/42026 |
op_doi |
https://doi.org/10.1016/j.aquaculture.2005.10.036 |
container_title |
Aquaculture |
container_volume |
254 |
container_issue |
1-4 |
container_start_page |
625 |
op_container_end_page |
636 |
_version_ |
1766362494719229952 |