Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors?
The current commercial production protocols for Atlantic cod depend on enriched rotifers and Artemia during first-feeding, but development and growth remain inferior to fish fed natural zooplankton. Two experiments were conducted in order to identify the underlying factors for this phenomenon. In th...
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ftdoajarticles:oai:doaj.org/article:b7b5a81612a14862832d7da39108bc43 2024-01-07T09:42:08+01:00 Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? Ørjan Karlsen Terje van der Meeren Ivar Rønnestad Anders Mangor-Jensen Trina F. Galloway Elin Kjørsvik Kristin Hamre 2015-05-01T00:00:00Z https://doi.org/10.7717/peerj.902 https://doaj.org/article/b7b5a81612a14862832d7da39108bc43 EN eng PeerJ Inc. https://peerj.com/articles/902.pdf https://peerj.com/articles/902/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.902 2167-8359 https://doaj.org/article/b7b5a81612a14862832d7da39108bc43 PeerJ, Vol 3, p e902 (2015) Atlantic cod Start feeding Nutrition Natural zooplankton Copepods Larvae Medicine R Biology (General) QH301-705.5 article 2015 ftdoajarticles https://doi.org/10.7717/peerj.902 2023-12-10T01:53:51Z The current commercial production protocols for Atlantic cod depend on enriched rotifers and Artemia during first-feeding, but development and growth remain inferior to fish fed natural zooplankton. Two experiments were conducted in order to identify the underlying factors for this phenomenon. In the first experiment (Exp-1), groups of cod larvae were fed either (a) natural zooplankton, mainly copepods, increasing the size of prey as the larvae grew or (b) enriched rotifers followed by Artemia (the intensive group). In the second experiment (Exp-2), two groups of larvae were fed as in Exp-1, while a third group was fed copepod nauplii (approximately the size of rotifers) throughout the larval stage. In both experiments, growth was not significantly different between the groups during the first three weeks after hatching, but from the last part of the rotifer feeding period and onwards, the growth of the larvae fed copepods was higher than that of the intensive group. In Exp-2, the growth was similar between the two copepod groups during the expeimental period, indicating that nutrient composition, not prey size caused the better growth on copepods. Analyses of the prey showed that total fatty acid composition and the ratio of phospholipids to total lipids was slightly different in the prey organisms, and that protein, taurine, astaxanthin and zinc were lower on a dry weight basis in rotifers than in copepods. Other measured nutrients as DHA, all analysed vitamins, manganese, copper and selenium were similar or higher in the rotifers. When compared to the present knowledge on nutrient requirements, protein and taurine appeared to be the most likely limiting nutrients for growth in cod larvae fed rotifers and Artemia. Larvae fed rotifers/Artemia had a higher whole body lipid content than larvae fed copepods at the end of the experiment (stage 5) after the fish had been fed the same formulated diet for approximately 2 weeks. Article in Journal/Newspaper atlantic cod Gadus morhua Copepods Rotifer Directory of Open Access Journals: DOAJ Articles PeerJ 3 e902 |
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language |
English |
topic |
Atlantic cod Start feeding Nutrition Natural zooplankton Copepods Larvae Medicine R Biology (General) QH301-705.5 |
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Atlantic cod Start feeding Nutrition Natural zooplankton Copepods Larvae Medicine R Biology (General) QH301-705.5 Ørjan Karlsen Terje van der Meeren Ivar Rønnestad Anders Mangor-Jensen Trina F. Galloway Elin Kjørsvik Kristin Hamre Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
topic_facet |
Atlantic cod Start feeding Nutrition Natural zooplankton Copepods Larvae Medicine R Biology (General) QH301-705.5 |
description |
The current commercial production protocols for Atlantic cod depend on enriched rotifers and Artemia during first-feeding, but development and growth remain inferior to fish fed natural zooplankton. Two experiments were conducted in order to identify the underlying factors for this phenomenon. In the first experiment (Exp-1), groups of cod larvae were fed either (a) natural zooplankton, mainly copepods, increasing the size of prey as the larvae grew or (b) enriched rotifers followed by Artemia (the intensive group). In the second experiment (Exp-2), two groups of larvae were fed as in Exp-1, while a third group was fed copepod nauplii (approximately the size of rotifers) throughout the larval stage. In both experiments, growth was not significantly different between the groups during the first three weeks after hatching, but from the last part of the rotifer feeding period and onwards, the growth of the larvae fed copepods was higher than that of the intensive group. In Exp-2, the growth was similar between the two copepod groups during the expeimental period, indicating that nutrient composition, not prey size caused the better growth on copepods. Analyses of the prey showed that total fatty acid composition and the ratio of phospholipids to total lipids was slightly different in the prey organisms, and that protein, taurine, astaxanthin and zinc were lower on a dry weight basis in rotifers than in copepods. Other measured nutrients as DHA, all analysed vitamins, manganese, copper and selenium were similar or higher in the rotifers. When compared to the present knowledge on nutrient requirements, protein and taurine appeared to be the most likely limiting nutrients for growth in cod larvae fed rotifers and Artemia. Larvae fed rotifers/Artemia had a higher whole body lipid content than larvae fed copepods at the end of the experiment (stage 5) after the fish had been fed the same formulated diet for approximately 2 weeks. |
format |
Article in Journal/Newspaper |
author |
Ørjan Karlsen Terje van der Meeren Ivar Rønnestad Anders Mangor-Jensen Trina F. Galloway Elin Kjørsvik Kristin Hamre |
author_facet |
Ørjan Karlsen Terje van der Meeren Ivar Rønnestad Anders Mangor-Jensen Trina F. Galloway Elin Kjørsvik Kristin Hamre |
author_sort |
Ørjan Karlsen |
title |
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
title_short |
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
title_full |
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
title_fullStr |
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
title_full_unstemmed |
Copepods enhance nutritional status, growth and development in Atlantic cod (Gadus morhua L.) larvae — can we identify the underlying factors? |
title_sort |
copepods enhance nutritional status, growth and development in atlantic cod (gadus morhua l.) larvae — can we identify the underlying factors? |
publisher |
PeerJ Inc. |
publishDate |
2015 |
url |
https://doi.org/10.7717/peerj.902 https://doaj.org/article/b7b5a81612a14862832d7da39108bc43 |
genre |
atlantic cod Gadus morhua Copepods Rotifer |
genre_facet |
atlantic cod Gadus morhua Copepods Rotifer |
op_source |
PeerJ, Vol 3, p e902 (2015) |
op_relation |
https://peerj.com/articles/902.pdf https://peerj.com/articles/902/ https://doaj.org/toc/2167-8359 doi:10.7717/peerj.902 2167-8359 https://doaj.org/article/b7b5a81612a14862832d7da39108bc43 |
op_doi |
https://doi.org/10.7717/peerj.902 |
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3 |
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1787423053924270080 |