Long-term trends in the glasseels immigrating at Den Oever, The Netherlands
Immigrating glasseels (Anguilla anguilla L.) have been sampled in Den Oever, the Netherlands, for numbers per dipnet haul (since 1938) and for length distribution (since 1960). The data from 1960 through 1996 were analysed to detect trends over the years. Special attention is paid to the analysis of...
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ftdoajarticles:oai:doaj.org/article:2d927f8cfab94d328f8ec53c8abbafc2 2023-05-15T13:26:59+02:00 Long-term trends in the glasseels immigrating at Den Oever, The Netherlands DEKKER W. 1998-04-01T00:00:00Z https://doi.org/10.1051/kmae:1998045 https://doaj.org/article/2d927f8cfab94d328f8ec53c8abbafc2 EN eng EDP Sciences http://dx.doi.org/10.1051/kmae:1998045 https://doaj.org/toc/1961-9502 1961-9502 doi:10.1051/kmae:1998045 https://doaj.org/article/2d927f8cfab94d328f8ec53c8abbafc2 Knowledge and Management of Aquatic Ecosystems, Vol 0, Iss 349, Pp 199-214 (1998) anguilla anguilla glasseel abundance length seasonality trends Aquaculture. Fisheries. Angling SH1-691 article 1998 ftdoajarticles https://doi.org/10.1051/kmae:1998045 2022-12-30T21:41:20Z Immigrating glasseels (Anguilla anguilla L.) have been sampled in Den Oever, the Netherlands, for numbers per dipnet haul (since 1938) and for length distribution (since 1960). The data from 1960 through 1996 were analysed to detect trends over the years. Special attention is paid to the analysis of potential artefacts caused by the sampling strategy. Mean length and numbers were positively correlated, while the timing showed independent, short-term fluctuations. From 1987 onwards, numbers of glasseels were well below the overall average, and they were significantly smaller. Since the minimum in 1991, numbers and mean lengths are both increasing, although they are still below average. It is tentatively concluded that these long-term changes are related to oceanic conditions, which have caused the prolonged and ocean-wide recruitment failure in eels, with the exclusion of suggested continental causes. Further clarification of the recruitment problem in eel is only to be expected when the reproduction problem is properly addressed, at the international level. Article in Journal/Newspaper Anguilla anguilla Directory of Open Access Journals: DOAJ Articles |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
anguilla anguilla glasseel abundance length seasonality trends Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
anguilla anguilla glasseel abundance length seasonality trends Aquaculture. Fisheries. Angling SH1-691 DEKKER W. Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
topic_facet |
anguilla anguilla glasseel abundance length seasonality trends Aquaculture. Fisheries. Angling SH1-691 |
description |
Immigrating glasseels (Anguilla anguilla L.) have been sampled in Den Oever, the Netherlands, for numbers per dipnet haul (since 1938) and for length distribution (since 1960). The data from 1960 through 1996 were analysed to detect trends over the years. Special attention is paid to the analysis of potential artefacts caused by the sampling strategy. Mean length and numbers were positively correlated, while the timing showed independent, short-term fluctuations. From 1987 onwards, numbers of glasseels were well below the overall average, and they were significantly smaller. Since the minimum in 1991, numbers and mean lengths are both increasing, although they are still below average. It is tentatively concluded that these long-term changes are related to oceanic conditions, which have caused the prolonged and ocean-wide recruitment failure in eels, with the exclusion of suggested continental causes. Further clarification of the recruitment problem in eel is only to be expected when the reproduction problem is properly addressed, at the international level. |
format |
Article in Journal/Newspaper |
author |
DEKKER W. |
author_facet |
DEKKER W. |
author_sort |
DEKKER W. |
title |
Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
title_short |
Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
title_full |
Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
title_fullStr |
Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
title_full_unstemmed |
Long-term trends in the glasseels immigrating at Den Oever, The Netherlands |
title_sort |
long-term trends in the glasseels immigrating at den oever, the netherlands |
publisher |
EDP Sciences |
publishDate |
1998 |
url |
https://doi.org/10.1051/kmae:1998045 https://doaj.org/article/2d927f8cfab94d328f8ec53c8abbafc2 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Knowledge and Management of Aquatic Ecosystems, Vol 0, Iss 349, Pp 199-214 (1998) |
op_relation |
http://dx.doi.org/10.1051/kmae:1998045 https://doaj.org/toc/1961-9502 1961-9502 doi:10.1051/kmae:1998045 https://doaj.org/article/2d927f8cfab94d328f8ec53c8abbafc2 |
op_doi |
https://doi.org/10.1051/kmae:1998045 |
_version_ |
1766395725124468736 |