Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review)
The requirements of most of the nutrients in fish larvae are unknown, due to difficulties in making the graded, stable and easily bio-available diets needed in dose response experiments. Instead, researchers have tried to find indirect methods to measure the nutrient requirements. One method is to a...
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World Aquaculture Society
2012
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ftunivromatorver:oai:art.torvergata.it:2108/251062 2024-02-04T09:58:50+01:00 Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) Hamre K Yufera M Conceição L Rønnestad I Boglione C Izquierdo M Hamre, K Yufera, M Conceição, L Rønnestad, I Boglione, C Izquierdo, M 2012 http://hdl.handle.net/2108/251062 https://www.aquaeas.eu/uncategorised/195-aqua-2012 eng eng World Aquaculture Society country:CZ place:Prague AQUA 2012 Global Aquaculture – Securing our future. volume:AQUA 2012 - Meeting Abstracts Book firstpage:452 lastpage:452 numberofpages:1 journal:SPECIAL PUBLICATION / EUROPEAN AQUACULTURE SOCIETY http://hdl.handle.net/2108/251062 https://www.aquaeas.eu/uncategorised/195-aqua-2012 info:eu-repo/semantics/restrictedAccess Settore BIO/07 - ECOLOGIA Settore AGR/18 - NUTRIZIONE E ALIMENTAZIONE ANIMALE Settore AGR/19 - ZOOTECNICA SPECIALE Settore AGR/20 - ZOOCOLTURE info:eu-repo/semantics/conferenceObject 2012 ftunivromatorver 2024-01-10T00:13:31Z The requirements of most of the nutrients in fish larvae are unknown, due to difficulties in making the graded, stable and easily bio-available diets needed in dose response experiments. Instead, researchers have tried to find indirect methods to measure the nutrient requirements. One method is to analyze the nutrient profile of the main natural diet, copepods, assuming that these organisms cover the requirements. Another is to extrapolate the requirements in fish to the larval stage. Other methods based on nutrient composition and utilization of the yolk and the uptake and metabolism of radiolabelled nutrients have also been applied. An important aspect is the definition of the requirement, e.g. the requirement for pigmentation and immune function may be different from that for optimal growth and survival. Furthermore, requirements may differ between species and with environmental conditions. In the present review, we look at some requirement estimates according to the present knowledge and compare them to the nutrient composition of live feeds. The protein requirement, extrapolated from juveniles in Atlantic cod and Atlantic halibut, appears to be higher than the protein content of their feed organisms, rotifers and Artemia, respectively. There are two experiments which measure quantitatively the requirements for phospholipids (PL) in fish larvae (ex. Cahu et al., 2003) and which indicate requirements of more that 45% of the lipid. This is higher than the PL content of rotifers and Artemia. The enrichment of rotifers with protein and PL is limited by the volume of their digestive tract, since these nutrients cannot be stored in excess in the rotifer tissues. Rotifers, but not always Artemia, can be enriched to contain enough n-3 fatty acids to cover the requirements in cold water species. Rotifers can occasionally drop below fish requirement levels in certain micronutrients, but enrichment can easily be obtained according to linear dose response models for most of these nutrients. There are thus many gaps in ... Conference Object atlantic cod Copepods Rotifer Universitá degli Studi di Roma "Tor Vergata": ART - Archivio Istituzionale della Ricerca |
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Open Polar |
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Universitá degli Studi di Roma "Tor Vergata": ART - Archivio Istituzionale della Ricerca |
op_collection_id |
ftunivromatorver |
language |
English |
topic |
Settore BIO/07 - ECOLOGIA Settore AGR/18 - NUTRIZIONE E ALIMENTAZIONE ANIMALE Settore AGR/19 - ZOOTECNICA SPECIALE Settore AGR/20 - ZOOCOLTURE |
spellingShingle |
Settore BIO/07 - ECOLOGIA Settore AGR/18 - NUTRIZIONE E ALIMENTAZIONE ANIMALE Settore AGR/19 - ZOOTECNICA SPECIALE Settore AGR/20 - ZOOCOLTURE Hamre K Yufera M Conceição L Rønnestad I Boglione C Izquierdo M Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
topic_facet |
Settore BIO/07 - ECOLOGIA Settore AGR/18 - NUTRIZIONE E ALIMENTAZIONE ANIMALE Settore AGR/19 - ZOOTECNICA SPECIALE Settore AGR/20 - ZOOCOLTURE |
description |
The requirements of most of the nutrients in fish larvae are unknown, due to difficulties in making the graded, stable and easily bio-available diets needed in dose response experiments. Instead, researchers have tried to find indirect methods to measure the nutrient requirements. One method is to analyze the nutrient profile of the main natural diet, copepods, assuming that these organisms cover the requirements. Another is to extrapolate the requirements in fish to the larval stage. Other methods based on nutrient composition and utilization of the yolk and the uptake and metabolism of radiolabelled nutrients have also been applied. An important aspect is the definition of the requirement, e.g. the requirement for pigmentation and immune function may be different from that for optimal growth and survival. Furthermore, requirements may differ between species and with environmental conditions. In the present review, we look at some requirement estimates according to the present knowledge and compare them to the nutrient composition of live feeds. The protein requirement, extrapolated from juveniles in Atlantic cod and Atlantic halibut, appears to be higher than the protein content of their feed organisms, rotifers and Artemia, respectively. There are two experiments which measure quantitatively the requirements for phospholipids (PL) in fish larvae (ex. Cahu et al., 2003) and which indicate requirements of more that 45% of the lipid. This is higher than the PL content of rotifers and Artemia. The enrichment of rotifers with protein and PL is limited by the volume of their digestive tract, since these nutrients cannot be stored in excess in the rotifer tissues. Rotifers, but not always Artemia, can be enriched to contain enough n-3 fatty acids to cover the requirements in cold water species. Rotifers can occasionally drop below fish requirement levels in certain micronutrients, but enrichment can easily be obtained according to linear dose response models for most of these nutrients. There are thus many gaps in ... |
author2 |
Hamre, K Yufera, M Conceição, L Rønnestad, I Boglione, C Izquierdo, M |
format |
Conference Object |
author |
Hamre K Yufera M Conceição L Rønnestad I Boglione C Izquierdo M |
author_facet |
Hamre K Yufera M Conceição L Rønnestad I Boglione C Izquierdo M |
author_sort |
Hamre K |
title |
Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
title_short |
Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
title_full |
Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
title_fullStr |
Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
title_full_unstemmed |
Fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
title_sort |
fish larval nutrition and feed formulation – knowledge gaps and bottlenecks for advances in larval rearing (a larvanet review) |
publisher |
World Aquaculture Society |
publishDate |
2012 |
url |
http://hdl.handle.net/2108/251062 https://www.aquaeas.eu/uncategorised/195-aqua-2012 |
genre |
atlantic cod Copepods Rotifer |
genre_facet |
atlantic cod Copepods Rotifer |
op_relation |
AQUA 2012 Global Aquaculture – Securing our future. volume:AQUA 2012 - Meeting Abstracts Book firstpage:452 lastpage:452 numberofpages:1 journal:SPECIAL PUBLICATION / EUROPEAN AQUACULTURE SOCIETY http://hdl.handle.net/2108/251062 https://www.aquaeas.eu/uncategorised/195-aqua-2012 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1789963399437746176 |