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: | https://hdl.handle.net/11250/2723110 https://doi.org/10.1016/j.fishres.2020.105670 |
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ftimr:oai:imr.brage.unit.no:11250/2723110 2023-05-15T14:58:35+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 application/pdf https://hdl.handle.net/11250/2723110 https://doi.org/10.1016/j.fishres.2020.105670 eng eng EC/H2020/675997 Nærings- og fiskeridepartementet: 83710 Nærings- og fiskeridepartementet: 14408 Fisheries Research. 2020, 230 . urn:issn:0165-7836 https://hdl.handle.net/11250/2723110 https://doi.org/10.1016/j.fishres.2020.105670 cristin:1820460 8 230 Fisheries Research Peer reviewed Journal article 2020 ftimr https://doi.org/10.1016/j.fishres.2020.105670 2021-09-23T20:15:58Z 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. publishedVersion Article in Journal/Newspaper Arctic Barents Sea Institute for Marine Research: Brage IMR Arctic Barents Sea Fisheries Research 230 105670 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
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. publishedVersion |
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 |
https://hdl.handle.net/11250/2723110 https://doi.org/10.1016/j.fishres.2020.105670 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea |
genre_facet |
Arctic Barents Sea |
op_source |
8 230 Fisheries Research |
op_relation |
EC/H2020/675997 Nærings- og fiskeridepartementet: 83710 Nærings- og fiskeridepartementet: 14408 Fisheries Research. 2020, 230 . urn:issn:0165-7836 https://hdl.handle.net/11250/2723110 https://doi.org/10.1016/j.fishres.2020.105670 cristin:1820460 |
op_doi |
https://doi.org/10.1016/j.fishres.2020.105670 |
container_title |
Fisheries Research |
container_volume |
230 |
container_start_page |
105670 |
_version_ |
1766330727835631616 |