Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism
In salmon aquaculture, fish occasionally escape from net pens. These domesticated salmon are genetically maladapted for living in natural environments however they still manage to interbreed with wild fish, resulting in severe levels of genetic introgression of farmed salmon in some Norwegian rivers...
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The University of Bergen
2016
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ftunivbergen:oai:bora.uib.no:1956/15352 2023-05-15T15:26:17+02:00 Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism Sambraus, Florian 2016-12-14 application/pdf https://hdl.handle.net/1956/15352 eng eng The University of Bergen Paper I: Sambrau , F., Fjelldal, P.G., Rem0, S.C., Hevrøy, E.M., Nilsen, T.O., Thorsen, A., Hansen, T.J. and Waagbø, R. Water temperature and dietary histidine affect cataract formation in Atlantic salmon (Salmo salar L.) diploid and triploid yearling smolt. Full text not available in BORA. Paper II: Sambrau , F., Olsen, R.E., Remen, M., Hansen, T.J., Torgersen, T. and Fjelldal, P.G. Water temperature and oxygen: The effect of triploidy on performance and metabolism in farmed Atlantic salmon (Salmo salar L.) post-smolts. Full text not available in BORA. Paper III: Sambrau , F., Remen, M., Olsen, R.E., Hansen, T.J., Waagbø, R., Torgersen, T., Lock, E.-J., lmsland, A., Fraser, T.W.K. and Fjelldal, P.G. Water temperature and oxygen: The effect of triploidy on performance and metabolism in adult farmed Atlantic salmon (Salmo salar L.). Full text not available in BORA. https://hdl.handle.net/1956/15352 cristin:1410672 Copyright the Author. All rights reserved Atlanterhavslaks Fiskefysiologi Oppdrettslaks Forstoffer Doctoral thesis 2016 ftunivbergen 2023-03-14T17:39:20Z In salmon aquaculture, fish occasionally escape from net pens. These domesticated salmon are genetically maladapted for living in natural environments however they still manage to interbreed with wild fish, resulting in severe levels of genetic introgression of farmed salmon in some Norwegian rivers. The use of sterile triploid farmed salmon, with three complete chromosome sets, would avoid further genetic introgression. Initial studies comparing diploids and triploids show reduced performance and higher mortality of triploid salmon that impeded their adoption to commercial farming. With advances in fish husbandry and further knowledge on triploid salmon biology, some of the farming related issues have been mitigated. However, to date, there are still challenges remaining in order to farm triploid Atlantic salmon profitably, sustainably and without jeopardizing fish welfare. Triploids perform poorly at high water temperatures and hypoxic periods, often associated with reduced growth and higher mortality compared to diploids. Further, triploid Atlantic salmon are more prone to develop ocular cataracts that can affect vision, feed intake and welfare. Additional supplementation of the amino acid histidine to the diet successfully mitigated cataract outbreaks and progression in diploid Atlantic salmon. However, the interactive effect between water temperature and dietary histidine level on cataract development in triploid salmon during the risk period of smoltification has not been studied. In order to investigate the temperature threshold for satisfactory performance and the physiological mechanisms behind reduced or poor performance at suboptimal environmental conditions, diploid and triploid Atlantic salmon post-smolts and adult fish were exposed to water temperatures between 3 and 18 °C (3 °C steps) and to hypoxic periods at cold (6 °C) and warm (18 °C) temperatures. Feed intake, growth and mortality were monitored as well as oxygen consumption, white muscle energy phosphate and carbohydrate storages, blood ... Doctoral or Postdoctoral Thesis Atlanterhavslaks Atlantic salmon University of Bergen: Bergen Open Research Archive (BORA-UiB) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Atlanterhavslaks Fiskefysiologi Oppdrettslaks Forstoffer |
spellingShingle |
Atlanterhavslaks Fiskefysiologi Oppdrettslaks Forstoffer Sambraus, Florian Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
topic_facet |
Atlanterhavslaks Fiskefysiologi Oppdrettslaks Forstoffer |
description |
In salmon aquaculture, fish occasionally escape from net pens. These domesticated salmon are genetically maladapted for living in natural environments however they still manage to interbreed with wild fish, resulting in severe levels of genetic introgression of farmed salmon in some Norwegian rivers. The use of sterile triploid farmed salmon, with three complete chromosome sets, would avoid further genetic introgression. Initial studies comparing diploids and triploids show reduced performance and higher mortality of triploid salmon that impeded their adoption to commercial farming. With advances in fish husbandry and further knowledge on triploid salmon biology, some of the farming related issues have been mitigated. However, to date, there are still challenges remaining in order to farm triploid Atlantic salmon profitably, sustainably and without jeopardizing fish welfare. Triploids perform poorly at high water temperatures and hypoxic periods, often associated with reduced growth and higher mortality compared to diploids. Further, triploid Atlantic salmon are more prone to develop ocular cataracts that can affect vision, feed intake and welfare. Additional supplementation of the amino acid histidine to the diet successfully mitigated cataract outbreaks and progression in diploid Atlantic salmon. However, the interactive effect between water temperature and dietary histidine level on cataract development in triploid salmon during the risk period of smoltification has not been studied. In order to investigate the temperature threshold for satisfactory performance and the physiological mechanisms behind reduced or poor performance at suboptimal environmental conditions, diploid and triploid Atlantic salmon post-smolts and adult fish were exposed to water temperatures between 3 and 18 °C (3 °C steps) and to hypoxic periods at cold (6 °C) and warm (18 °C) temperatures. Feed intake, growth and mortality were monitored as well as oxygen consumption, white muscle energy phosphate and carbohydrate storages, blood ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Sambraus, Florian |
author_facet |
Sambraus, Florian |
author_sort |
Sambraus, Florian |
title |
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
title_short |
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
title_full |
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
title_fullStr |
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
title_full_unstemmed |
Solving bottlenecks in triploid Atlantic salmon production. Temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
title_sort |
solving bottlenecks in triploid atlantic salmon production. temperature, hypoxia and dietary effects on performance, cataracts and metabolism |
publisher |
The University of Bergen |
publishDate |
2016 |
url |
https://hdl.handle.net/1956/15352 |
genre |
Atlanterhavslaks Atlantic salmon |
genre_facet |
Atlanterhavslaks Atlantic salmon |
op_relation |
Paper I: Sambrau , F., Fjelldal, P.G., Rem0, S.C., Hevrøy, E.M., Nilsen, T.O., Thorsen, A., Hansen, T.J. and Waagbø, R. Water temperature and dietary histidine affect cataract formation in Atlantic salmon (Salmo salar L.) diploid and triploid yearling smolt. Full text not available in BORA. Paper II: Sambrau , F., Olsen, R.E., Remen, M., Hansen, T.J., Torgersen, T. and Fjelldal, P.G. Water temperature and oxygen: The effect of triploidy on performance and metabolism in farmed Atlantic salmon (Salmo salar L.) post-smolts. Full text not available in BORA. Paper III: Sambrau , F., Remen, M., Olsen, R.E., Hansen, T.J., Waagbø, R., Torgersen, T., Lock, E.-J., lmsland, A., Fraser, T.W.K. and Fjelldal, P.G. Water temperature and oxygen: The effect of triploidy on performance and metabolism in adult farmed Atlantic salmon (Salmo salar L.). Full text not available in BORA. https://hdl.handle.net/1956/15352 cristin:1410672 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766356795469594624 |