Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters
Abstract The transformation of yellow eel into silver eel is called 'silvering', and takes place prior to migration. We found the sedentary yellow phase in spring, the migratory silver phase in autumn, while August was a cross-over month. We used principal component analysis (PCA) to chara...
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crbrillap:10.1163/157075607780002014 2024-05-12T07:52:57+00:00 Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters van Ginneken, Vincent Durif, Caroline Balm, S. Paul Boot, Ron Verstegen, Martin Antonissen, Erik van Den Thillart, Guido 2007 http://dx.doi.org/10.1163/157075607780002014 https://brill.com/view/journals/ab/57/1/article-p63_6.xml https://brill.com/downloadpdf/journals/ab/57/1/article-p63_6.xml unknown Brill Animal Biology volume 57, issue 1, page 63-77 ISSN 1570-7555 1570-7563 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2007 crbrillap https://doi.org/10.1163/157075607780002014 2024-04-18T06:53:32Z Abstract The transformation of yellow eel into silver eel is called 'silvering', and takes place prior to migration. We found the sedentary yellow phase in spring, the migratory silver phase in autumn, while August was a cross-over month. We used principal component analysis (PCA) to characterise the morphological and physiological changes that accompany silvering in the European eel (Anguilla anguilla L.). Silvering is positively related to external parameters such as eye size, internal maturation parameters like GSI, vitellogenine (VIT), and blood-substrates such as phospholipids, Free Fatty Acids (FFA), and cholesterol. The Hepatosomatic Index was not significantly different between yellow and silver groups. In contrast, a significant difference was observed for parameters of body constitution (fat, protein, dry matter) between yellow and silver stages. Furthermore, the process of silvering is accompanied with increased levels of cortisol in autumn, which plays a role in mobilisation of metabolic energy from body stores towards migratory activity and gonadal growth. Based on Principal Component Analysis (PCA) with physiological, morphological and endocrinological parameters, it is concluded that during the process of silvering, several developmental stages can be recognised, with a timeframe of the premigratory sedentary yellow phase from April until July, August is a cross-over month, and the migratory silver phase is found from September until November. Article in Journal/Newspaper Anguilla anguilla Brill Animal Biology 57 1 63 77 |
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Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
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Animal Science and Zoology Ecology, Evolution, Behavior and Systematics van Ginneken, Vincent Durif, Caroline Balm, S. Paul Boot, Ron Verstegen, Martin Antonissen, Erik van Den Thillart, Guido Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract The transformation of yellow eel into silver eel is called 'silvering', and takes place prior to migration. We found the sedentary yellow phase in spring, the migratory silver phase in autumn, while August was a cross-over month. We used principal component analysis (PCA) to characterise the morphological and physiological changes that accompany silvering in the European eel (Anguilla anguilla L.). Silvering is positively related to external parameters such as eye size, internal maturation parameters like GSI, vitellogenine (VIT), and blood-substrates such as phospholipids, Free Fatty Acids (FFA), and cholesterol. The Hepatosomatic Index was not significantly different between yellow and silver groups. In contrast, a significant difference was observed for parameters of body constitution (fat, protein, dry matter) between yellow and silver stages. Furthermore, the process of silvering is accompanied with increased levels of cortisol in autumn, which plays a role in mobilisation of metabolic energy from body stores towards migratory activity and gonadal growth. Based on Principal Component Analysis (PCA) with physiological, morphological and endocrinological parameters, it is concluded that during the process of silvering, several developmental stages can be recognised, with a timeframe of the premigratory sedentary yellow phase from April until July, August is a cross-over month, and the migratory silver phase is found from September until November. |
format |
Article in Journal/Newspaper |
author |
van Ginneken, Vincent Durif, Caroline Balm, S. Paul Boot, Ron Verstegen, Martin Antonissen, Erik van Den Thillart, Guido |
author_facet |
van Ginneken, Vincent Durif, Caroline Balm, S. Paul Boot, Ron Verstegen, Martin Antonissen, Erik van Den Thillart, Guido |
author_sort |
van Ginneken, Vincent |
title |
Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
title_short |
Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
title_full |
Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
title_fullStr |
Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
title_full_unstemmed |
Silvering of European eel (Anguilla anguilla L.): seasonal changes of morphological and metabolic parameters |
title_sort |
silvering of european eel (anguilla anguilla l.): seasonal changes of morphological and metabolic parameters |
publisher |
Brill |
publishDate |
2007 |
url |
http://dx.doi.org/10.1163/157075607780002014 https://brill.com/view/journals/ab/57/1/article-p63_6.xml https://brill.com/downloadpdf/journals/ab/57/1/article-p63_6.xml |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Animal Biology volume 57, issue 1, page 63-77 ISSN 1570-7555 1570-7563 |
op_doi |
https://doi.org/10.1163/157075607780002014 |
container_title |
Animal Biology |
container_volume |
57 |
container_issue |
1 |
container_start_page |
63 |
op_container_end_page |
77 |
_version_ |
1798839104353337344 |