The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon
Two experiments, involving the addition of thyroid hormones to the diet of salmon parr (Salmo salar) were carried out. The prime purpose of these experiments was to study the effect of feeding thyroid hormones on saltwater tolerance. Saltwater tolerance is interrelated with size and therefore growth...
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Canadian Science Publishing
1982
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Online Access: | http://dx.doi.org/10.1139/z82-346 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-346 |
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crcansciencepubl:10.1139/z82-346 2023-12-17T10:27:22+01:00 The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon Refstie, Terje 1982 http://dx.doi.org/10.1139/z82-346 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-346 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 60, issue 11, page 2706-2712 ISSN 0008-4301 1480-3283 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 1982 crcansciencepubl https://doi.org/10.1139/z82-346 2023-11-19T13:38:59Z Two experiments, involving the addition of thyroid hormones to the diet of salmon parr (Salmo salar) were carried out. The prime purpose of these experiments was to study the effect of feeding thyroid hormones on saltwater tolerance. Saltwater tolerance is interrelated with size and therefore growth rate was investigated. In experiment I three different thyroid preparations were used: thyroid extract, 3,5,3′-triiodo-L-thyronine (T 3 ), and thyroxine (T 4 ). Each thyroid preparation was fed to two different sizes of fish with two different concentrations in the diet. T 3 gave the best overall results, both for saltwater tolerance and growth rate. No interaction was found between fish size and concentration of thyroid hormone in the diet. In experiment II three different concentrations of T 3 in the diet were fed to salmon parr of two different ages. Feeding T 3 improved saltwater tolerance and growth rate of 7-month-old fish but had a negative effect upon growth for 19-month-old fish. For the 7-month-old fish 10 mg T 3 /kg dry food gave the best effect on saltwater tolerance, while 1 mg T 3 /kg dry food was enough to improve growth. It is concluded that it is possible to induce smoltification in underyearling Atlantic salmon out of season by feeding thyroid hormones. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing (via Crossref) Canadian Journal of Zoology 60 11 2706 2712 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
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Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Refstie, Terje The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Two experiments, involving the addition of thyroid hormones to the diet of salmon parr (Salmo salar) were carried out. The prime purpose of these experiments was to study the effect of feeding thyroid hormones on saltwater tolerance. Saltwater tolerance is interrelated with size and therefore growth rate was investigated. In experiment I three different thyroid preparations were used: thyroid extract, 3,5,3′-triiodo-L-thyronine (T 3 ), and thyroxine (T 4 ). Each thyroid preparation was fed to two different sizes of fish with two different concentrations in the diet. T 3 gave the best overall results, both for saltwater tolerance and growth rate. No interaction was found between fish size and concentration of thyroid hormone in the diet. In experiment II three different concentrations of T 3 in the diet were fed to salmon parr of two different ages. Feeding T 3 improved saltwater tolerance and growth rate of 7-month-old fish but had a negative effect upon growth for 19-month-old fish. For the 7-month-old fish 10 mg T 3 /kg dry food gave the best effect on saltwater tolerance, while 1 mg T 3 /kg dry food was enough to improve growth. It is concluded that it is possible to induce smoltification in underyearling Atlantic salmon out of season by feeding thyroid hormones. |
format |
Article in Journal/Newspaper |
author |
Refstie, Terje |
author_facet |
Refstie, Terje |
author_sort |
Refstie, Terje |
title |
The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
title_short |
The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
title_full |
The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
title_fullStr |
The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
title_full_unstemmed |
The effect of feeding thyroid hormones on saltwater tolerance and growth rate of Atlantic salmon |
title_sort |
effect of feeding thyroid hormones on saltwater tolerance and growth rate of atlantic salmon |
publisher |
Canadian Science Publishing |
publishDate |
1982 |
url |
http://dx.doi.org/10.1139/z82-346 http://www.nrcresearchpress.com/doi/pdf/10.1139/z82-346 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Zoology volume 60, issue 11, page 2706-2712 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z82-346 |
container_title |
Canadian Journal of Zoology |
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60 |
container_issue |
11 |
container_start_page |
2706 |
op_container_end_page |
2712 |
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1785579205838241792 |