Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf
Eel larvae caught in the mid North Atlantic and along the continental slope off the Portuguese coast are studied together with samples of glass eels caught just before entering fresh water along the Dutch and French coasts.\nDuring their migration from the mid Atlantic towards the continental slope...
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ftnaturalis:oai:repository.naturalis.nl:504158 2024-02-11T09:55:34+01:00 Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf Utrecht, W.L. van Holleboom, M.A. 1985-01-01 application/pdf https://repository.naturalis.nl/pub/504158 unknown https://repository.naturalis.nl/pub/504158 Bijdragen tot de dierkunde vol. 55 no. 2, pp. 249-262 info:eu-repo/semantics/article 1985 ftnaturalis 2024-01-17T23:22:06Z Eel larvae caught in the mid North Atlantic and along the continental slope off the Portuguese coast are studied together with samples of glass eels caught just before entering fresh water along the Dutch and French coasts.\nDuring their migration from the mid Atlantic towards the continental slope the mean length of the larvae investigated increased from 56 to 66 mm, while the mean diameter of their otoliths increased from 0.17 to 0.23 mm. The animals from the mid Atlantic had three complete growth zones in their otoliths, while the majority of those from the continental slope had four complete growth zones.\nThe specimens from the mid Atlantic show typical larval aspects as e.g. position of the anus and reaction to preservation, this in contrast to most of the animals caught along the continental slope. In 70% of the latter the position of the anus is varying and they turned completely opaque after preservation in alcohol; the remaining animals showed all typical larval aspects.\nIn the glass eels the numbers of growth zones varied from two to six complete ones, about 40% of the animals having four or more growth zones in their otoliths.\nThe results indicate that the variation in age found in the glass eels most probably comes into existence along the continental slope, where a number of larvae lag behind in metamorphosis.\nThe growth zones in the otoliths seem to represent completed regular growth cycles which are supposed to be annual. Article in Journal/Newspaper Anguilla anguilla North Atlantic Naturalis Institutional Repository |
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Naturalis Institutional Repository |
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Eel larvae caught in the mid North Atlantic and along the continental slope off the Portuguese coast are studied together with samples of glass eels caught just before entering fresh water along the Dutch and French coasts.\nDuring their migration from the mid Atlantic towards the continental slope the mean length of the larvae investigated increased from 56 to 66 mm, while the mean diameter of their otoliths increased from 0.17 to 0.23 mm. The animals from the mid Atlantic had three complete growth zones in their otoliths, while the majority of those from the continental slope had four complete growth zones.\nThe specimens from the mid Atlantic show typical larval aspects as e.g. position of the anus and reaction to preservation, this in contrast to most of the animals caught along the continental slope. In 70% of the latter the position of the anus is varying and they turned completely opaque after preservation in alcohol; the remaining animals showed all typical larval aspects.\nIn the glass eels the numbers of growth zones varied from two to six complete ones, about 40% of the animals having four or more growth zones in their otoliths.\nThe results indicate that the variation in age found in the glass eels most probably comes into existence along the continental slope, where a number of larvae lag behind in metamorphosis.\nThe growth zones in the otoliths seem to represent completed regular growth cycles which are supposed to be annual. |
format |
Article in Journal/Newspaper |
author |
Utrecht, W.L. van Holleboom, M.A. |
spellingShingle |
Utrecht, W.L. van Holleboom, M.A. Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
author_facet |
Utrecht, W.L. van Holleboom, M.A. |
author_sort |
Utrecht, W.L. van |
title |
Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
title_short |
Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
title_full |
Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
title_fullStr |
Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
title_full_unstemmed |
Notes on eel larvae (Anguilla anguilla Linnaeus, 1758) from the central and eastern North Atlantic and on glass eels from the European continental shelf |
title_sort |
notes on eel larvae (anguilla anguilla linnaeus, 1758) from the central and eastern north atlantic and on glass eels from the european continental shelf |
publishDate |
1985 |
url |
https://repository.naturalis.nl/pub/504158 |
genre |
Anguilla anguilla North Atlantic |
genre_facet |
Anguilla anguilla North Atlantic |
op_source |
Bijdragen tot de dierkunde vol. 55 no. 2, pp. 249-262 |
op_relation |
https://repository.naturalis.nl/pub/504158 |
_version_ |
1790597461134278656 |