Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea
The protection of spawning fish from anthropogenic impacts requires information on the location, timing, and interannual persistence of spawning aggregations. In this study, generalized additive models were used to predict the spawning habitat of North Sea cod, based on the abundance of spawning fis...
Published in: | ICES Journal of Marine Science: Journal du Conseil |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/10508/14991 https://doi.org/10.1093/icesjms/fsv180 |
id |
ftieo:oai:repositorio.ieo.es:10508/14991 |
---|---|
record_format |
openpolar |
spelling |
ftieo:oai:repositorio.ieo.es:10508/14991 2023-06-11T04:10:11+02:00 Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea González-Irusta, J.M. (José Manuel) Wright, P.J. 2016 http://hdl.handle.net/10508/14991 https://doi.org/10.1093/icesjms/fsv180 eng eng Oxford University Press (OUP) Sede Central IEO http://hdl.handle.net/10508/14991 doi:10.1093/icesjms/fsv180 open access research article 2016 ftieo https://doi.org/10.1093/icesjms/fsv180 2023-05-02T23:49:30Z The protection of spawning fish from anthropogenic impacts requires information on the location, timing, and interannual persistence of spawning aggregations. In this study, generalized additive models were used to predict the spawning habitat of North Sea cod, based on the abundance of spawning fish within three population subareas and nine environmental layers. The length of spawning cod differed among population subareas, consistent with published evidence of maturation differences. In the northeast North Sea (Viking), the peak in the spawning season was estimated to occur after the survey which made the prediction of spawning grounds for this area less certain. Cod were found to prefer areas with temperatures around 5–7°C for spawning and there was a general preference for high salinity waters. Persistence of cod spawning grounds over the study period was related to interannual stability in temperature, with high variability in the use of Southern Bight spawning grounds. As such, cod appear to minimize interannual variability in the initial environmental conditions affecting offspring survival by selecting suitable cold spawning grounds. Seabed conditions also affected spawning distribution with cod selecting coarse sand and avoiding areas of very high tidal flow. The model prediction was compared with the distribution of cod aggregations during the spawning season reported by fishing boats. Seventy per cent of the aggregations was located in areas classified as occasional or recurrent spawning grounds. The predicted distribution confirmed the widespread occurrence of spawning in the North Sea and showed good agreement with recent and past studies of cod egg distribution, suggesting that nearly all major historical areas of spawning still appear in use today. However, the study also found that the recent recovery of spawning-stock biomass was not uniform across the stock, being centred in the northwest subarea. Article in Journal/Newspaper atlantic cod Gadus morhua Instituto Español de Oceanografía: e-IEO ICES Journal of Marine Science: Journal du Conseil 73 2 304 315 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
description |
The protection of spawning fish from anthropogenic impacts requires information on the location, timing, and interannual persistence of spawning aggregations. In this study, generalized additive models were used to predict the spawning habitat of North Sea cod, based on the abundance of spawning fish within three population subareas and nine environmental layers. The length of spawning cod differed among population subareas, consistent with published evidence of maturation differences. In the northeast North Sea (Viking), the peak in the spawning season was estimated to occur after the survey which made the prediction of spawning grounds for this area less certain. Cod were found to prefer areas with temperatures around 5–7°C for spawning and there was a general preference for high salinity waters. Persistence of cod spawning grounds over the study period was related to interannual stability in temperature, with high variability in the use of Southern Bight spawning grounds. As such, cod appear to minimize interannual variability in the initial environmental conditions affecting offspring survival by selecting suitable cold spawning grounds. Seabed conditions also affected spawning distribution with cod selecting coarse sand and avoiding areas of very high tidal flow. The model prediction was compared with the distribution of cod aggregations during the spawning season reported by fishing boats. Seventy per cent of the aggregations was located in areas classified as occasional or recurrent spawning grounds. The predicted distribution confirmed the widespread occurrence of spawning in the North Sea and showed good agreement with recent and past studies of cod egg distribution, suggesting that nearly all major historical areas of spawning still appear in use today. However, the study also found that the recent recovery of spawning-stock biomass was not uniform across the stock, being centred in the northwest subarea. |
format |
Article in Journal/Newspaper |
author |
González-Irusta, J.M. (José Manuel) Wright, P.J. |
spellingShingle |
González-Irusta, J.M. (José Manuel) Wright, P.J. Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
author_facet |
González-Irusta, J.M. (José Manuel) Wright, P.J. |
author_sort |
González-Irusta, J.M. (José Manuel) |
title |
Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
title_short |
Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
title_full |
Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
title_fullStr |
Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
title_full_unstemmed |
Spawning grounds of Atlantic cod (Gadus morhua) in the North Sea |
title_sort |
spawning grounds of atlantic cod (gadus morhua) in the north sea |
publisher |
Oxford University Press (OUP) |
publishDate |
2016 |
url |
http://hdl.handle.net/10508/14991 https://doi.org/10.1093/icesjms/fsv180 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://hdl.handle.net/10508/14991 doi:10.1093/icesjms/fsv180 |
op_rights |
open access |
op_doi |
https://doi.org/10.1093/icesjms/fsv180 |
container_title |
ICES Journal of Marine Science: Journal du Conseil |
container_volume |
73 |
container_issue |
2 |
container_start_page |
304 |
op_container_end_page |
315 |
_version_ |
1768384446336073728 |