The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period
Abstract In the late 1960s, two local herring stocks and one seasonal migratory herring stock in Icelandic waters collapsed primarily due to overfishing. While the stocks of Icelandic summer-spawning herring (ISSH) and Norwegian spring-spawning herring (NSSH) have recovered, Icelandic spring-spawnin...
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsy120 http://academic.oup.com/icesjms/article-pdf/75/6/2025/31239204/fsy120.pdf |
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croxfordunivpr:10.1093/icesjms/fsy120 2024-01-14T10:08:01+01:00 The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period Óskarsson, Guðmundur J Heino, Mikko 2018 http://dx.doi.org/10.1093/icesjms/fsy120 http://academic.oup.com/icesjms/article-pdf/75/6/2025/31239204/fsy120.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model ICES Journal of Marine Science volume 75, issue 6, page 2025-2032 ISSN 1054-3139 1095-9289 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2018 croxfordunivpr https://doi.org/10.1093/icesjms/fsy120 2023-12-15T09:46:43Z Abstract In the late 1960s, two local herring stocks and one seasonal migratory herring stock in Icelandic waters collapsed primarily due to overfishing. While the stocks of Icelandic summer-spawning herring (ISSH) and Norwegian spring-spawning herring (NSSH) have recovered, Icelandic spring-spawning herring (ISPH) has not. The main objective of this work is to explore the existence of ISPH and identify potential signs of recovery. Analyses were based on samples from the autumn fishery and survey data from 1962 to 2016. In the autumn, local ISSH and ISPH cohabitated and mixed in the main fishery, where sampled fish were categorized into stocks on basis of maturity stage. The results indicate that the proportion of ISPH was in the range of 13–33% in the 1960s while below 5% and on average 1.4% during 1970–2016. Several year classes of ISPH exhibit notable differences from the general low levels and caused a slight increase in ISPH spawning-stock biomass for corresponding years. An increase in proportion of generally old ISPH around 2004 and 2013 occurred simultaneously with the reappearances of NSSH in the feeding areas east and north of Iceland, respectively. Altogether, it supports earlier suggestions that ISPH might require immigration from NSSH to recover, as these were considered closely related stocks. This is consistent with the source-sink theoretical model of stock size regulation. Article in Journal/Newspaper Iceland Oxford University Press (via Crossref) ICES Journal of Marine Science 75 6 2025 2032 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Óskarsson, Guðmundur J The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract In the late 1960s, two local herring stocks and one seasonal migratory herring stock in Icelandic waters collapsed primarily due to overfishing. While the stocks of Icelandic summer-spawning herring (ISSH) and Norwegian spring-spawning herring (NSSH) have recovered, Icelandic spring-spawning herring (ISPH) has not. The main objective of this work is to explore the existence of ISPH and identify potential signs of recovery. Analyses were based on samples from the autumn fishery and survey data from 1962 to 2016. In the autumn, local ISSH and ISPH cohabitated and mixed in the main fishery, where sampled fish were categorized into stocks on basis of maturity stage. The results indicate that the proportion of ISPH was in the range of 13–33% in the 1960s while below 5% and on average 1.4% during 1970–2016. Several year classes of ISPH exhibit notable differences from the general low levels and caused a slight increase in ISPH spawning-stock biomass for corresponding years. An increase in proportion of generally old ISPH around 2004 and 2013 occurred simultaneously with the reappearances of NSSH in the feeding areas east and north of Iceland, respectively. Altogether, it supports earlier suggestions that ISPH might require immigration from NSSH to recover, as these were considered closely related stocks. This is consistent with the source-sink theoretical model of stock size regulation. |
author2 |
Heino, Mikko |
format |
Article in Journal/Newspaper |
author |
Óskarsson, Guðmundur J |
author_facet |
Óskarsson, Guðmundur J |
author_sort |
Óskarsson, Guðmundur J |
title |
The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
title_short |
The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
title_full |
The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
title_fullStr |
The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
title_full_unstemmed |
The existence and population connectivity of Icelandic spring-spawning herring over a 50-year collapse period |
title_sort |
existence and population connectivity of icelandic spring-spawning herring over a 50-year collapse period |
publisher |
Oxford University Press (OUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1093/icesjms/fsy120 http://academic.oup.com/icesjms/article-pdf/75/6/2025/31239204/fsy120.pdf |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
ICES Journal of Marine Science volume 75, issue 6, page 2025-2032 ISSN 1054-3139 1095-9289 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/icesjms/fsy120 |
container_title |
ICES Journal of Marine Science |
container_volume |
75 |
container_issue |
6 |
container_start_page |
2025 |
op_container_end_page |
2032 |
_version_ |
1788062440979693568 |