Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare
Farming of Atlantic salmon have been in rapid growth since the 1970's and is now an important industry in many countries around the North Atlantic as well as Chile. Since 2000, all countries with farming of Atlantic salmon and rainbow have faced challenges with the development of drug resistant...
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Norwegian University of Life Sciences, Ås
2019
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Online Access: | https://hdl.handle.net/11250/2685283 |
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ftunivmob:oai:nmbu.brage.unit.no:11250/2685283 2024-09-15T17:56:03+00:00 Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare Oppdrett av atlantisk laks (Salmo salar) i lukkede merder : forekomst av lakselus, vekst, dødelighet og fiskevelferd Nilsen, Arve Sørum, Henning Biering, Eirik Bergheim, Asbjørn Mejdell, Cecilie Norway 2019 application/pdf https://hdl.handle.net/11250/2685283 eng eng Norwegian University of Life Sciences, Ås PhD Thesis;2019:48 urn:isbn:978-82-575-1607-9 urn:issn:1894-6402 https://hdl.handle.net/11250/2685283 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no Atlantic salmon Closed containment systems Growth rates Mortality Fish welfare Sea lice Doctoral thesis 2019 ftunivmob 2024-07-19T03:05:57Z Farming of Atlantic salmon have been in rapid growth since the 1970's and is now an important industry in many countries around the North Atlantic as well as Chile. Since 2000, all countries with farming of Atlantic salmon and rainbow have faced challenges with the development of drug resistant sea lice. The use of drugs and the cost of production has increased, this has undermined the aquaculture industry's profitability and reputation. In Norway, the rapid growth of salmon farming was arrested from 2012, mainly because of increasing problems with drug resistant salmon lice (Lepeophtheirus salmonis). Norwegian authorities have issued new farming licenses with the purpose of encouraging fish farming companies to solve the most important environmental challenges. Increased production of salmon in land-based facilities, the development of offshore aquaculture and different varieties of closed containment systems (CCS) have been proposed. When this thesis was developed (2012-2015), the knowledge about fish health and welfare in commercial scale CCS was limited. It was important to assess if the use of untreated deep water could provide sufficient protection against sea lice and if introduction of lice could lead to sea lice reproduction and sustained infestations in the closed cages. Furthermore, it was necessary to investigate growth rates, mortality rates, mortality causes and fish welfare in CCS. Our studies showed that CCS with water intake at a 25 m depth provided effective protection against sea lice copepodites (Lepeophtheirus salmonis and Caligus elongatus). Adult Caligus elongatus were observed occasionally and at low abundancies. When sea lice were introduced into CCS, we observed no signs of reproduction or sustained infestations. Without sea lice, there was no need for treatments. This reduced the environmental impact and improved fish welfare with production of salmon in CCS, compared to traditional net-pens. Mean thermal growth coefficient (TGC) for post-smolt in CCS was close to 3.0, ranging between ... Doctoral or Postdoctoral Thesis Atlantic salmon North Atlantic Salmo salar Open archive Norwegian University of Life Sciences: Brage NMBU |
institution |
Open Polar |
collection |
Open archive Norwegian University of Life Sciences: Brage NMBU |
op_collection_id |
ftunivmob |
language |
English |
topic |
Atlantic salmon Closed containment systems Growth rates Mortality Fish welfare Sea lice |
spellingShingle |
Atlantic salmon Closed containment systems Growth rates Mortality Fish welfare Sea lice Nilsen, Arve Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
topic_facet |
Atlantic salmon Closed containment systems Growth rates Mortality Fish welfare Sea lice |
description |
Farming of Atlantic salmon have been in rapid growth since the 1970's and is now an important industry in many countries around the North Atlantic as well as Chile. Since 2000, all countries with farming of Atlantic salmon and rainbow have faced challenges with the development of drug resistant sea lice. The use of drugs and the cost of production has increased, this has undermined the aquaculture industry's profitability and reputation. In Norway, the rapid growth of salmon farming was arrested from 2012, mainly because of increasing problems with drug resistant salmon lice (Lepeophtheirus salmonis). Norwegian authorities have issued new farming licenses with the purpose of encouraging fish farming companies to solve the most important environmental challenges. Increased production of salmon in land-based facilities, the development of offshore aquaculture and different varieties of closed containment systems (CCS) have been proposed. When this thesis was developed (2012-2015), the knowledge about fish health and welfare in commercial scale CCS was limited. It was important to assess if the use of untreated deep water could provide sufficient protection against sea lice and if introduction of lice could lead to sea lice reproduction and sustained infestations in the closed cages. Furthermore, it was necessary to investigate growth rates, mortality rates, mortality causes and fish welfare in CCS. Our studies showed that CCS with water intake at a 25 m depth provided effective protection against sea lice copepodites (Lepeophtheirus salmonis and Caligus elongatus). Adult Caligus elongatus were observed occasionally and at low abundancies. When sea lice were introduced into CCS, we observed no signs of reproduction or sustained infestations. Without sea lice, there was no need for treatments. This reduced the environmental impact and improved fish welfare with production of salmon in CCS, compared to traditional net-pens. Mean thermal growth coefficient (TGC) for post-smolt in CCS was close to 3.0, ranging between ... |
author2 |
Sørum, Henning Biering, Eirik Bergheim, Asbjørn Mejdell, Cecilie |
format |
Doctoral or Postdoctoral Thesis |
author |
Nilsen, Arve |
author_facet |
Nilsen, Arve |
author_sort |
Nilsen, Arve |
title |
Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
title_short |
Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
title_full |
Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
title_fullStr |
Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
title_full_unstemmed |
Production of Atlantic salmon (Salmo salar) in closed confinement systems (CCS) : salmon lice, growth rates, mortality and fish welfare |
title_sort |
production of atlantic salmon (salmo salar) in closed confinement systems (ccs) : salmon lice, growth rates, mortality and fish welfare |
publisher |
Norwegian University of Life Sciences, Ås |
publishDate |
2019 |
url |
https://hdl.handle.net/11250/2685283 |
op_coverage |
Norway |
genre |
Atlantic salmon North Atlantic Salmo salar |
genre_facet |
Atlantic salmon North Atlantic Salmo salar |
op_relation |
PhD Thesis;2019:48 urn:isbn:978-82-575-1607-9 urn:issn:1894-6402 https://hdl.handle.net/11250/2685283 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
_version_ |
1810432265441771520 |