Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames
The up‐river migration of eels in the R. Thames has been studied at a number of locations since 1985. The run occurs between April and October, with the majority of eels moving over a distinct period averaging 47 days in May–June. The timing of the run varies and its commencement appears to be mainl...
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Language: | English |
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crwiley:10.1111/j.1095-8649.1988.tb05570.x 2024-06-02T07:55:12+00:00 Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames Naismith, I. A. Knights, B. 1988 http://dx.doi.org/10.1111/j.1095-8649.1988.tb05570.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1988.tb05570.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1988.tb05570.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 33, issue sA, page 161-175 ISSN 0022-1112 1095-8649 journal-article 1988 crwiley https://doi.org/10.1111/j.1095-8649.1988.tb05570.x 2024-05-03T11:57:29Z The up‐river migration of eels in the R. Thames has been studied at a number of locations since 1985. The run occurs between April and October, with the majority of eels moving over a distinct period averaging 47 days in May–June. The timing of the run varies and its commencement appears to be mainly dependent on water temperature. The number of unpigmented elvers migrating from the estuary to fresh water is variable and most appear to spend at least one year in the estuary. The average size and age of migrants increases with distance upstream. Migrants leaving the estuary were mainly 1–3 river‐year (<14 cm) pigmented juveniles, though individuals of up to 45 cm were encountered. At a site 15 km from the estuary the majority of migrants were between 4 and 8 river‐year eels (20–30 cm). Mark–recapture studies showed variable tendencies to display migratory behaviour among individuals, with some taking up to 2 years to reappear in a trap when released a few hundred metres below it. The implications of the results with respect to the commercial fishery in the estuary, populations in the catchment, and the contribution of Thames eels to international stocks and recruitment are discussed. Article in Journal/Newspaper Anguilla anguilla Wiley Online Library Journal of Fish Biology 33 sa 161 175 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The up‐river migration of eels in the R. Thames has been studied at a number of locations since 1985. The run occurs between April and October, with the majority of eels moving over a distinct period averaging 47 days in May–June. The timing of the run varies and its commencement appears to be mainly dependent on water temperature. The number of unpigmented elvers migrating from the estuary to fresh water is variable and most appear to spend at least one year in the estuary. The average size and age of migrants increases with distance upstream. Migrants leaving the estuary were mainly 1–3 river‐year (<14 cm) pigmented juveniles, though individuals of up to 45 cm were encountered. At a site 15 km from the estuary the majority of migrants were between 4 and 8 river‐year eels (20–30 cm). Mark–recapture studies showed variable tendencies to display migratory behaviour among individuals, with some taking up to 2 years to reappear in a trap when released a few hundred metres below it. The implications of the results with respect to the commercial fishery in the estuary, populations in the catchment, and the contribution of Thames eels to international stocks and recruitment are discussed. |
format |
Article in Journal/Newspaper |
author |
Naismith, I. A. Knights, B. |
spellingShingle |
Naismith, I. A. Knights, B. Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
author_facet |
Naismith, I. A. Knights, B. |
author_sort |
Naismith, I. A. |
title |
Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
title_short |
Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
title_full |
Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
title_fullStr |
Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
title_full_unstemmed |
Migrations of elvers and juvenile European eels, Anguilla anguilla L., in the River Thames |
title_sort |
migrations of elvers and juvenile european eels, anguilla anguilla l., in the river thames |
publisher |
Wiley |
publishDate |
1988 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1988.tb05570.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1988.tb05570.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1988.tb05570.x |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Journal of Fish Biology volume 33, issue sA, page 161-175 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1988.tb05570.x |
container_title |
Journal of Fish Biology |
container_volume |
33 |
container_issue |
sa |
container_start_page |
161 |
op_container_end_page |
175 |
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1800746790795870208 |