Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus)
There are currently no dedicated recruitment survey data available in support of the assessment of the abundance and distribution of Northeast Atlantic (NEA) mackerel (Scomber scombrus), one of the most widespread and commercially important fish stocks in the North Atlantic. This is despite the fact...
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2014
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Online Access: | http://hdl.handle.net/10379/12073 https://doi.org/10.13025/28530 https://doi.org/10.1093/icesjms/fsu186 |
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ftnuigalway:oai:https://researchrepository.universityofgalway.ie:10379/12073 2024-09-30T14:39:48+00:00 Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) Jansen, Teunis Kristensen, Kasper van der Kooij, Jeroen Post, Søren Campbell, Andrew Utne, Kjell Rong Carrera, Pablo Jacobsen, Jan Arge Gudmundssdottir, Asta Roel, Beatriz A. Hatfield, Emma M. C. 2014-10-29 http://hdl.handle.net/10379/12073 https://doi.org/10.13025/28530 https://doi.org/10.1093/icesjms/fsu186 unknown Oxford University Press (OUP) ICES Journal of Marine Science: Journal du Conseil Jansen, Teunis; Kristensen, Kasper; van der Kooij, Jeroen; Post, Søren; Campbell, Andrew; Utne, Kjell Rong; Carrera, Pablo; Jacobsen, Jan Arge; Gudmundssdottir, Asta; Roel, Beatriz A. Hatfield, Emma M. C. (2014). Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus). ICES Journal of Marine Science: Journal du Conseil 72 (6), 1779-1789 1054-3139,1095-9289 http://hdl.handle.net/10379/12073 https://doi.org/10.13025/28530 doi:10.1093/icesjms/fsu186 Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ acoustic cantabrian sea catchability demersal trawl survey forecast geostatistics lgc mackerel northeast atlantic north sea recruitment scomber scombrus stock assessment Article 2014 ftnuigalway https://doi.org/10.13025/2853010.1093/icesjms/fsu186 2024-09-17T14:44:30Z There are currently no dedicated recruitment survey data available in support of the assessment of the abundance and distribution of Northeast Atlantic (NEA) mackerel (Scomber scombrus), one of the most widespread and commercially important fish stocks in the North Atlantic. This is despite the fact that an estimate of recruitment is an important requirement for the provision of advice to fishery managers. The work here addresses this by compiling catch rates of juvenile mackerel from bottom-trawl surveys conducted between October and March during 1998-2012 and applying a log Gaussian Cox (LGC) process geostatistical model incorporating spatio-temporal correlations. A statistically significant correlation between the modelled catch rates in adjacent quarters 4 and 1 (Q4 and Q1) demonstrates that bottom-trawl surveys in winter are an appropriate platform for sampling juvenile mackerel, and that the LCG model is successful in extracting a population abundance signal from the data. In this regard, the model performed appreciably better than a more commonly used raising algorithm based on survey swept-area estimates. Therefore, the LCG model was expanded to include data from the entire survey time-series, and a recruitment index was developed for use in the annual ICES stock assessment. We hypothesize that catchability is positively density-dependant and provides supporting evidence from acoustic observations. Various density-dependant transformations of the modelled catch rates were furthermore found to improve the correlation between the derived annual recruitment index and recruitment estimated by back calculation of adult mackerel data. Square root transformation led to the strongest correlation, so this is recommended for further analysis of mackerel abundance. Finally, we provide maps of spatial distributions, showing that the most important nursery areas are around Ireland, north and west of Scotland, in the northern North Sea north of 59 degrees N and, to some extent, also in the Bay of Biscay. Article in Journal/Newspaper North Atlantic Northeast Atlantic National University of Ireland (NUI), Galway: ARAN |
institution |
Open Polar |
collection |
National University of Ireland (NUI), Galway: ARAN |
op_collection_id |
ftnuigalway |
language |
unknown |
topic |
acoustic cantabrian sea catchability demersal trawl survey forecast geostatistics lgc mackerel northeast atlantic north sea recruitment scomber scombrus stock assessment |
spellingShingle |
acoustic cantabrian sea catchability demersal trawl survey forecast geostatistics lgc mackerel northeast atlantic north sea recruitment scomber scombrus stock assessment Jansen, Teunis Kristensen, Kasper van der Kooij, Jeroen Post, Søren Campbell, Andrew Utne, Kjell Rong Carrera, Pablo Jacobsen, Jan Arge Gudmundssdottir, Asta Roel, Beatriz A. Hatfield, Emma M. C. Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
topic_facet |
acoustic cantabrian sea catchability demersal trawl survey forecast geostatistics lgc mackerel northeast atlantic north sea recruitment scomber scombrus stock assessment |
description |
There are currently no dedicated recruitment survey data available in support of the assessment of the abundance and distribution of Northeast Atlantic (NEA) mackerel (Scomber scombrus), one of the most widespread and commercially important fish stocks in the North Atlantic. This is despite the fact that an estimate of recruitment is an important requirement for the provision of advice to fishery managers. The work here addresses this by compiling catch rates of juvenile mackerel from bottom-trawl surveys conducted between October and March during 1998-2012 and applying a log Gaussian Cox (LGC) process geostatistical model incorporating spatio-temporal correlations. A statistically significant correlation between the modelled catch rates in adjacent quarters 4 and 1 (Q4 and Q1) demonstrates that bottom-trawl surveys in winter are an appropriate platform for sampling juvenile mackerel, and that the LCG model is successful in extracting a population abundance signal from the data. In this regard, the model performed appreciably better than a more commonly used raising algorithm based on survey swept-area estimates. Therefore, the LCG model was expanded to include data from the entire survey time-series, and a recruitment index was developed for use in the annual ICES stock assessment. We hypothesize that catchability is positively density-dependant and provides supporting evidence from acoustic observations. Various density-dependant transformations of the modelled catch rates were furthermore found to improve the correlation between the derived annual recruitment index and recruitment estimated by back calculation of adult mackerel data. Square root transformation led to the strongest correlation, so this is recommended for further analysis of mackerel abundance. Finally, we provide maps of spatial distributions, showing that the most important nursery areas are around Ireland, north and west of Scotland, in the northern North Sea north of 59 degrees N and, to some extent, also in the Bay of Biscay. |
format |
Article in Journal/Newspaper |
author |
Jansen, Teunis Kristensen, Kasper van der Kooij, Jeroen Post, Søren Campbell, Andrew Utne, Kjell Rong Carrera, Pablo Jacobsen, Jan Arge Gudmundssdottir, Asta Roel, Beatriz A. Hatfield, Emma M. C. |
author_facet |
Jansen, Teunis Kristensen, Kasper van der Kooij, Jeroen Post, Søren Campbell, Andrew Utne, Kjell Rong Carrera, Pablo Jacobsen, Jan Arge Gudmundssdottir, Asta Roel, Beatriz A. Hatfield, Emma M. C. |
author_sort |
Jansen, Teunis |
title |
Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
title_short |
Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
title_full |
Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
title_fullStr |
Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
title_full_unstemmed |
Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
title_sort |
nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus) |
publisher |
Oxford University Press (OUP) |
publishDate |
2014 |
url |
http://hdl.handle.net/10379/12073 https://doi.org/10.13025/28530 https://doi.org/10.1093/icesjms/fsu186 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
ICES Journal of Marine Science: Journal du Conseil Jansen, Teunis; Kristensen, Kasper; van der Kooij, Jeroen; Post, Søren; Campbell, Andrew; Utne, Kjell Rong; Carrera, Pablo; Jacobsen, Jan Arge; Gudmundssdottir, Asta; Roel, Beatriz A. Hatfield, Emma M. C. (2014). Nursery areas and recruitment variation of northeast atlantic mackerel (scomber scombrus). ICES Journal of Marine Science: Journal du Conseil 72 (6), 1779-1789 1054-3139,1095-9289 http://hdl.handle.net/10379/12073 https://doi.org/10.13025/28530 doi:10.1093/icesjms/fsu186 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Ireland https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
op_doi |
https://doi.org/10.13025/2853010.1093/icesjms/fsu186 |
_version_ |
1811642398270291968 |