Growth in early life stages of fishes : an explanatory model
Although fish larvae grow very fast, little is known about to which extent their metabolism and nutritional requirements differ from larger fish. Modelling can be a powerful too] to promote understanding and optimisation of growth in fish larvae. The main objective of this study was to develop an ex...
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Landbouwuniversiteit Wageningen
1997
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ftunivwagenin:oai:library.wur.nl:wurpubs/37676 2024-02-11T10:08:28+01:00 Growth in early life stages of fishes : an explanatory model Conceicao, L.E.C. 1997 application/pdf https://research.wur.nl/en/publications/growth-in-early-life-stages-of-fishes-an-explanatory-model en eng Landbouwuniversiteit Wageningen https://edepot.wur.nl/210497 https://research.wur.nl/en/publications/growth-in-early-life-stages-of-fishes-an-explanatory-model info:eu-repo/semantics/openAccess Wageningen University & Research computer simulation feeds fish culture fishes growth larvae metabolism metamorphosis models research simulation simulation models computersimulatie groei larven metabolisme metamorfose modellen onderzoek simulatie simulatiemodellen vissen visteelt voer info:eu-repo/semantics/doctoralThesis Doctoral thesis info:eu-repo/semantics/publishedVersion 1997 ftunivwagenin 2024-01-17T23:48:04Z Although fish larvae grow very fast, little is known about to which extent their metabolism and nutritional requirements differ from larger fish. Modelling can be a powerful too] to promote understanding and optimisation of growth in fish larvae. The main objective of this study was to develop an explanatory model that can simulate growth in fish larvae. The study was conducted in three steps, i.e., a design, an experimentation and a modelling step. In the first step, the framework of the model was developed using yolksac larvae of the African catfish, Clarias gariepinus . The model is nutrient driven, and based on the biochemical reactions underlying the growth process. The model predicted growth rather accurately until complete yolk absorption, and suggested what information was needed for its further development. In the second step, experimental data on protein metabolism and the energetics of growth were collected. They constituted the basis for the design and parameterisation of a model for fed larvae. In the African catfish, the cost of growth decreases with increasing growth rates, down to the theoretical minima for protein synthesis. Fast growing larvae of turbot, Scophthalmus maximus , also have a cost of growth close to the theoretical minimum for protein synthesis. The amino acid (AA) profile of the free pool in turbot larvae is highly variable, being very sensitive to AA coming from the diet and protein turnover. Both in the African catfish and turbot, the larval AA profile changed during ontogeny, especially before the start of exogenous feeding. The AA profiles of the diets differed considerably from the larval ones, suggesting high unavoidable AA losses. In yolk-sac larvae of catfish, there is little regulation of catabolism of AA, and no sparing of essential AA. In contrast to this, turbot larvae may be able to spare essential AA towards the end of the larval stage. In the third and final stage, the model was parameterised and validated for African catfish and turbot. With a sensitivity analysis ... Doctoral or Postdoctoral Thesis Scophthalmus maximus Turbot Wageningen UR (University & Research Centre): Digital Library |
institution |
Open Polar |
collection |
Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
computer simulation feeds fish culture fishes growth larvae metabolism metamorphosis models research simulation simulation models computersimulatie groei larven metabolisme metamorfose modellen onderzoek simulatie simulatiemodellen vissen visteelt voer |
spellingShingle |
computer simulation feeds fish culture fishes growth larvae metabolism metamorphosis models research simulation simulation models computersimulatie groei larven metabolisme metamorfose modellen onderzoek simulatie simulatiemodellen vissen visteelt voer Conceicao, L.E.C. Growth in early life stages of fishes : an explanatory model |
topic_facet |
computer simulation feeds fish culture fishes growth larvae metabolism metamorphosis models research simulation simulation models computersimulatie groei larven metabolisme metamorfose modellen onderzoek simulatie simulatiemodellen vissen visteelt voer |
description |
Although fish larvae grow very fast, little is known about to which extent their metabolism and nutritional requirements differ from larger fish. Modelling can be a powerful too] to promote understanding and optimisation of growth in fish larvae. The main objective of this study was to develop an explanatory model that can simulate growth in fish larvae. The study was conducted in three steps, i.e., a design, an experimentation and a modelling step. In the first step, the framework of the model was developed using yolksac larvae of the African catfish, Clarias gariepinus . The model is nutrient driven, and based on the biochemical reactions underlying the growth process. The model predicted growth rather accurately until complete yolk absorption, and suggested what information was needed for its further development. In the second step, experimental data on protein metabolism and the energetics of growth were collected. They constituted the basis for the design and parameterisation of a model for fed larvae. In the African catfish, the cost of growth decreases with increasing growth rates, down to the theoretical minima for protein synthesis. Fast growing larvae of turbot, Scophthalmus maximus , also have a cost of growth close to the theoretical minimum for protein synthesis. The amino acid (AA) profile of the free pool in turbot larvae is highly variable, being very sensitive to AA coming from the diet and protein turnover. Both in the African catfish and turbot, the larval AA profile changed during ontogeny, especially before the start of exogenous feeding. The AA profiles of the diets differed considerably from the larval ones, suggesting high unavoidable AA losses. In yolk-sac larvae of catfish, there is little regulation of catabolism of AA, and no sparing of essential AA. In contrast to this, turbot larvae may be able to spare essential AA towards the end of the larval stage. In the third and final stage, the model was parameterised and validated for African catfish and turbot. With a sensitivity analysis ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Conceicao, L.E.C. |
author_facet |
Conceicao, L.E.C. |
author_sort |
Conceicao, L.E.C. |
title |
Growth in early life stages of fishes : an explanatory model |
title_short |
Growth in early life stages of fishes : an explanatory model |
title_full |
Growth in early life stages of fishes : an explanatory model |
title_fullStr |
Growth in early life stages of fishes : an explanatory model |
title_full_unstemmed |
Growth in early life stages of fishes : an explanatory model |
title_sort |
growth in early life stages of fishes : an explanatory model |
publisher |
Landbouwuniversiteit Wageningen |
publishDate |
1997 |
url |
https://research.wur.nl/en/publications/growth-in-early-life-stages-of-fishes-an-explanatory-model |
genre |
Scophthalmus maximus Turbot |
genre_facet |
Scophthalmus maximus Turbot |
op_relation |
https://edepot.wur.nl/210497 https://research.wur.nl/en/publications/growth-in-early-life-stages-of-fishes-an-explanatory-model |
op_rights |
info:eu-repo/semantics/openAccess Wageningen University & Research |
_version_ |
1790607810279505920 |