The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L.
Abstract This study quantifies the processes involved in regulating the European eel population of Lough Neagh, a lake in Northern Ireland. The relationship between glass eel input and silver eel output for the 1923–1997 cohorts was best described by a Beverton–Holt stock recruitment model. Glass ee...
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Online Access: | http://dx.doi.org/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14820 |
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crwiley:10.1111/jfb.14820 2024-09-09T19:00:42+00:00 The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. Aprahamian, Miran W. Evans, Derek W. Briand, Cedric Walker, Alan M. McElarney, Yvonne Allen, Michelle Department for Environment, Food and Rural Affairs, UK Government Department of Agriculture, Australian Government 2021 http://dx.doi.org/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14820 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Journal of Fish Biology volume 99, issue 4, page 1201-1221 ISSN 0022-1112 1095-8649 journal-article 2021 crwiley https://doi.org/10.1111/jfb.14820 2024-08-22T04:17:47Z Abstract This study quantifies the processes involved in regulating the European eel population of Lough Neagh, a lake in Northern Ireland. The relationship between glass eel input and silver eel output for the 1923–1997 cohorts was best described by a Beverton–Holt stock recruitment model. Glass eel input time series was not complete and was thus derived from the relationship between catches elsewhere in Europe and Lough Neagh, together with the addition of stocked glass eel. Silver eel output was the sum of silver eel escapement, catch and yellow eel catch converted to silver eel equivalents. Natural mortality increased with glass eel density, ranging from 0.017 to 0.142 year −1 . The mean carrying capacity increased from ≈3.25 M silver eels (≈26 kg ha −1 ) for the 1923–1943 cohorts to ≈5.0 M (≈40 kg ha −1 ) for the 1948–1971 cohorts before regressing back to ≈3.25 M. The total silver eel output was highest during the late 1970s/early 1980s at 35–45 kg ha −1 year −1 and lowest during the early years of the 20th century and is currently at 10–15 kg ha −1 year −1 . The findings are discussed in relation to (a) the ecological changes that have occurred within the lough, associated with eutrophication and the introduction of roach ( Rutilus rutilus L.), and (b) the decline of the wider European eel stock across its distribution range. The findings from this study have relevance for the wider management of the European eel stock. Article in Journal/Newspaper Anguilla anguilla Wiley Online Library Journal of Fish Biology |
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English |
description |
Abstract This study quantifies the processes involved in regulating the European eel population of Lough Neagh, a lake in Northern Ireland. The relationship between glass eel input and silver eel output for the 1923–1997 cohorts was best described by a Beverton–Holt stock recruitment model. Glass eel input time series was not complete and was thus derived from the relationship between catches elsewhere in Europe and Lough Neagh, together with the addition of stocked glass eel. Silver eel output was the sum of silver eel escapement, catch and yellow eel catch converted to silver eel equivalents. Natural mortality increased with glass eel density, ranging from 0.017 to 0.142 year −1 . The mean carrying capacity increased from ≈3.25 M silver eels (≈26 kg ha −1 ) for the 1923–1943 cohorts to ≈5.0 M (≈40 kg ha −1 ) for the 1948–1971 cohorts before regressing back to ≈3.25 M. The total silver eel output was highest during the late 1970s/early 1980s at 35–45 kg ha −1 year −1 and lowest during the early years of the 20th century and is currently at 10–15 kg ha −1 year −1 . The findings are discussed in relation to (a) the ecological changes that have occurred within the lough, associated with eutrophication and the introduction of roach ( Rutilus rutilus L.), and (b) the decline of the wider European eel stock across its distribution range. The findings from this study have relevance for the wider management of the European eel stock. |
author2 |
Department for Environment, Food and Rural Affairs, UK Government Department of Agriculture, Australian Government |
format |
Article in Journal/Newspaper |
author |
Aprahamian, Miran W. Evans, Derek W. Briand, Cedric Walker, Alan M. McElarney, Yvonne Allen, Michelle |
spellingShingle |
Aprahamian, Miran W. Evans, Derek W. Briand, Cedric Walker, Alan M. McElarney, Yvonne Allen, Michelle The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
author_facet |
Aprahamian, Miran W. Evans, Derek W. Briand, Cedric Walker, Alan M. McElarney, Yvonne Allen, Michelle |
author_sort |
Aprahamian, Miran W. |
title |
The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
title_short |
The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
title_full |
The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
title_fullStr |
The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
title_full_unstemmed |
The changing times of Europe's largest remaining commercially harvested population of eel Anguilla anguilla L. |
title_sort |
changing times of europe's largest remaining commercially harvested population of eel anguilla anguilla l. |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.14820 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/jfb.14820 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Journal of Fish Biology volume 99, issue 4, page 1201-1221 ISSN 0022-1112 1095-8649 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/jfb.14820 |
container_title |
Journal of Fish Biology |
_version_ |
1809941415493369856 |