Growth hormone reduces growth in free‐living Atlantic salmon fry
Summary 1. Although life‐history theory predicts that juvenile growth rates should be high, there is substantial evidence that most juveniles grow below their physiological maximum. The endocrine system plays an important role in the determination of fundamental life‐history traits, and hormones oft...
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Online Access: | http://dx.doi.org/10.1111/j.1365-2435.2012.01999.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2435.2012.01999.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2435.2012.01999.x |
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crwiley:10.1111/j.1365-2435.2012.01999.x 2024-09-15T17:56:15+00:00 Growth hormone reduces growth in free‐living Atlantic salmon fry Sundt‐Hansen, Line Einum, Sigurd Neregård, Lena Björnsson, Björn Thrandur Johnsson, Jörgen I. Fleming, Ian A. Devlin, Robert H. Hindar, Kjetil 2012 http://dx.doi.org/10.1111/j.1365-2435.2012.01999.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2435.2012.01999.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2435.2012.01999.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Functional Ecology volume 26, issue 4, page 904-911 ISSN 0269-8463 1365-2435 journal-article 2012 crwiley https://doi.org/10.1111/j.1365-2435.2012.01999.x 2024-08-06T04:15:38Z Summary 1. Although life‐history theory predicts that juvenile growth rates should be high, there is substantial evidence that most juveniles grow below their physiological maximum. The endocrine system plays an important role in the determination of fundamental life‐history traits, and hormones often serve as a link between an organism’s environment and the expression of a trait. Particularly, growth is a life‐history trait, which is strongly associated with growth hormone (GH) in fish, as well as most vertebrates. 2. To elucidate trade‐offs related to elevated GH in fish in a natural environment, we experimentally administrated GH exogenously to juvenile Atlantic salmon using sustained‐release GH implants, at an earlier ontogenetic stage than previously achieved (1·5 months). We assessed the effects on growth, dispersal and survival in contrasting environments. 3. Exogenous GH treatment increased the growth rate when fish were fed ad libitum in captivity. However, in a natural stream, GH treatment had a significant negative effect on growth and no apparent effect on survival or dispersal. This contrasts with previous studies conducted at later developmental stages, which show either a positive growth effect or no effect of elevated GH levels. 4. This study shows that environmental conditions strongly affect the response to GH and that under some natural conditions, it may also reduce growth. We suggest that the endogenous plasma GH levels may be maximizing growth during early, but not later, juvenile stages in nature. Article in Journal/Newspaper Atlantic salmon Wiley Online Library Functional Ecology 26 4 904 911 |
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English |
description |
Summary 1. Although life‐history theory predicts that juvenile growth rates should be high, there is substantial evidence that most juveniles grow below their physiological maximum. The endocrine system plays an important role in the determination of fundamental life‐history traits, and hormones often serve as a link between an organism’s environment and the expression of a trait. Particularly, growth is a life‐history trait, which is strongly associated with growth hormone (GH) in fish, as well as most vertebrates. 2. To elucidate trade‐offs related to elevated GH in fish in a natural environment, we experimentally administrated GH exogenously to juvenile Atlantic salmon using sustained‐release GH implants, at an earlier ontogenetic stage than previously achieved (1·5 months). We assessed the effects on growth, dispersal and survival in contrasting environments. 3. Exogenous GH treatment increased the growth rate when fish were fed ad libitum in captivity. However, in a natural stream, GH treatment had a significant negative effect on growth and no apparent effect on survival or dispersal. This contrasts with previous studies conducted at later developmental stages, which show either a positive growth effect or no effect of elevated GH levels. 4. This study shows that environmental conditions strongly affect the response to GH and that under some natural conditions, it may also reduce growth. We suggest that the endogenous plasma GH levels may be maximizing growth during early, but not later, juvenile stages in nature. |
format |
Article in Journal/Newspaper |
author |
Sundt‐Hansen, Line Einum, Sigurd Neregård, Lena Björnsson, Björn Thrandur Johnsson, Jörgen I. Fleming, Ian A. Devlin, Robert H. Hindar, Kjetil |
spellingShingle |
Sundt‐Hansen, Line Einum, Sigurd Neregård, Lena Björnsson, Björn Thrandur Johnsson, Jörgen I. Fleming, Ian A. Devlin, Robert H. Hindar, Kjetil Growth hormone reduces growth in free‐living Atlantic salmon fry |
author_facet |
Sundt‐Hansen, Line Einum, Sigurd Neregård, Lena Björnsson, Björn Thrandur Johnsson, Jörgen I. Fleming, Ian A. Devlin, Robert H. Hindar, Kjetil |
author_sort |
Sundt‐Hansen, Line |
title |
Growth hormone reduces growth in free‐living Atlantic salmon fry |
title_short |
Growth hormone reduces growth in free‐living Atlantic salmon fry |
title_full |
Growth hormone reduces growth in free‐living Atlantic salmon fry |
title_fullStr |
Growth hormone reduces growth in free‐living Atlantic salmon fry |
title_full_unstemmed |
Growth hormone reduces growth in free‐living Atlantic salmon fry |
title_sort |
growth hormone reduces growth in free‐living atlantic salmon fry |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1365-2435.2012.01999.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2435.2012.01999.x https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2435.2012.01999.x |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
Functional Ecology volume 26, issue 4, page 904-911 ISSN 0269-8463 1365-2435 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2435.2012.01999.x |
container_title |
Functional Ecology |
container_volume |
26 |
container_issue |
4 |
container_start_page |
904 |
op_container_end_page |
911 |
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1810432452309549056 |