Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus
Although the phenomenon of skipped spawning has been described in numerous fishes, time-series are scarce. We used the presence of post-ovulatory follicles in histological gonad slides from females not developing oocytes for Northeast Arctic (NEA) haddock Melanogrammus aeglefinus from 2009 to 2012 t...
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Online Access: | http://hdl.handle.net/10852/81829 http://urn.nb.no/URN:NBN:no-84851 https://doi.org/10.1016/j.fishres.2020.105670 |
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ftoslouniv:oai:www.duo.uio.no:10852/81829 2023-05-15T14:27:47+02:00 Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian 2020-07-24T15:14:41Z http://hdl.handle.net/10852/81829 http://urn.nb.no/URN:NBN:no-84851 https://doi.org/10.1016/j.fishres.2020.105670 EN eng EC/H2020/675997 TRADEINDUSTRYANDFISH/14408 TRADEINDUSTRYANDFISH/83710 http://urn.nb.no/URN:NBN:no-84851 Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian . Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus. Fisheries Research. 2020, 230 http://hdl.handle.net/10852/81829 1820460 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Fisheries Research&rft.volume=230&rft.spage=&rft.date=2020 Fisheries Research 230 8 https://doi.org/10.1016/j.fishres.2020.105670 URN:NBN:no-84851 Fulltext https://www.duo.uio.no/bitstream/handle/10852/81829/1/Largeannualvariation.pdf Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ CC-BY 0165-7836 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2020 ftoslouniv https://doi.org/10.1016/j.fishres.2020.105670 2020-12-23T23:31:05Z Although the phenomenon of skipped spawning has been described in numerous fishes, time-series are scarce. We used the presence of post-ovulatory follicles in histological gonad slides from females not developing oocytes for Northeast Arctic (NEA) haddock Melanogrammus aeglefinus from 2009 to 2012 to construct a length-based statistical model giving the probability that a non - developing female was skipping spawning, as opposed to not being sexually mature. This model was then applied on demographic winter survey data from the Barents Sea from 1989 to 2014. This indicated large annual variation in skipping numbers. Comparing these survey estimates to the total annual ICES stock numbers, we found that skipping peaked in the years 1994–1996 and 2009–2014, when the median yearly estimate of skipped spawners was 20–45 % of all females aged ≥ 3 years. In contrast, only ∼ 3 % of females at age ≥ 3 years skipped spawning in 2007. The proportional representation of skipped spawners at the stock level appeared linked to stock energy reserves with more skipping occurring when energy levels were low. Skipping also became more frequent with increasing population age, i.e. when immatures were less abundant, although the very largest/oldest fish tended to spawn. Because the proportion of NEA haddock that skips spawning is variable and can be high, understanding variation in this phenomenon and its drivers may improve population dynamic models. Article in Journal/Newspaper Arctic Arctic Barents Sea Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Barents Sea Fisheries Research 230 105670 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Although the phenomenon of skipped spawning has been described in numerous fishes, time-series are scarce. We used the presence of post-ovulatory follicles in histological gonad slides from females not developing oocytes for Northeast Arctic (NEA) haddock Melanogrammus aeglefinus from 2009 to 2012 to construct a length-based statistical model giving the probability that a non - developing female was skipping spawning, as opposed to not being sexually mature. This model was then applied on demographic winter survey data from the Barents Sea from 1989 to 2014. This indicated large annual variation in skipping numbers. Comparing these survey estimates to the total annual ICES stock numbers, we found that skipping peaked in the years 1994–1996 and 2009–2014, when the median yearly estimate of skipped spawners was 20–45 % of all females aged ≥ 3 years. In contrast, only ∼ 3 % of females at age ≥ 3 years skipped spawning in 2007. The proportional representation of skipped spawners at the stock level appeared linked to stock energy reserves with more skipping occurring when energy levels were low. Skipping also became more frequent with increasing population age, i.e. when immatures were less abundant, although the very largest/oldest fish tended to spawn. Because the proportion of NEA haddock that skips spawning is variable and can be high, understanding variation in this phenomenon and its drivers may improve population dynamic models. |
format |
Article in Journal/Newspaper |
author |
Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian |
spellingShingle |
Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
author_facet |
Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian |
author_sort |
Skjæraasen, Jon Egil |
title |
Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
title_short |
Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
title_full |
Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
title_fullStr |
Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
title_full_unstemmed |
Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus |
title_sort |
large annual variation in the amount of skipped spawning for female northeast arctic haddock melanogrammus aeglefinus |
publishDate |
2020 |
url |
http://hdl.handle.net/10852/81829 http://urn.nb.no/URN:NBN:no-84851 https://doi.org/10.1016/j.fishres.2020.105670 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Arctic Barents Sea |
genre_facet |
Arctic Arctic Barents Sea |
op_source |
0165-7836 |
op_relation |
EC/H2020/675997 TRADEINDUSTRYANDFISH/14408 TRADEINDUSTRYANDFISH/83710 http://urn.nb.no/URN:NBN:no-84851 Skjæraasen, Jon Egil Korsbrekke, Knut Dingsør, Gjert Endre Langangen, Øystein Opdal, Anders Frugård Jørgensen, Christian . Large annual variation in the amount of skipped spawning for female Northeast Arctic haddock Melanogrammus aeglefinus. Fisheries Research. 2020, 230 http://hdl.handle.net/10852/81829 1820460 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Fisheries Research&rft.volume=230&rft.spage=&rft.date=2020 Fisheries Research 230 8 https://doi.org/10.1016/j.fishres.2020.105670 URN:NBN:no-84851 Fulltext https://www.duo.uio.no/bitstream/handle/10852/81829/1/Largeannualvariation.pdf |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.fishres.2020.105670 |
container_title |
Fisheries Research |
container_volume |
230 |
container_start_page |
105670 |
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1766301692972761088 |