Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten
Abstract Michalsen, K., Johannesen, E., and Bogstad, B. 2008. Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten. – ICES Journal of Marine Science, 65: 571–580. Many authors state that cod (Gadus morhua) do not feed during the spawning period. However, this more or less establis...
Published in: | ICES Journal of Marine Science |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2008
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/icesjms/fsn019 http://academic.oup.com/icesjms/article-pdf/65/4/571/29129769/fsn019.pdf |
id |
croxfordunivpr:10.1093/icesjms/fsn019 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/icesjms/fsn019 2024-09-15T17:52:28+00:00 Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten Michalsen, Kathrine Johannesen, Edda Bogstad, Bjarte 2008 http://dx.doi.org/10.1093/icesjms/fsn019 http://academic.oup.com/icesjms/article-pdf/65/4/571/29129769/fsn019.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 65, issue 4, page 571-580 ISSN 1095-9289 1054-3139 journal-article 2008 croxfordunivpr https://doi.org/10.1093/icesjms/fsn019 2024-08-27T04:18:00Z Abstract Michalsen, K., Johannesen, E., and Bogstad, B. 2008. Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten. – ICES Journal of Marine Science, 65: 571–580. Many authors state that cod (Gadus morhua) do not feed during the spawning period. However, this more or less established fact has rarely been investigated in the field. Here, the content of stomachs from Northeast Arctic cod (NEAC) and Norwegian coastal cod (NCC) sampled from the spawning ground in Lofoten were examined over a 10-year period (1996–2006). The occurrence of food in the stomachs of spawning cod, stomach fullness, diet composition, and variation in these variables between NEAC and NCC, year, and sex were analysed and compared. The analysis shows that cod do feed, even when they are in a spawning state. NCC had a lower proportion of empty stomachs and the stomachs were fuller than those from NEAC. Females had a lower proportion of empty stomachs than males and their stomachs were in general fuller. Herring (Clupea harengus) dominated the diet of cod. However, cod consumption of herring on the spawning grounds seems to be a minor source of mortality on herring. Although spawning cod do feed, the proportion of empty stomachs was higher and stomach fullness was lower than in stomachs of NEAC from the Barents Sea. Article in Journal/Newspaper Arctic cod Barents Sea Gadus morhua Lofoten Northeast Arctic cod Oxford University Press ICES Journal of Marine Science 65 4 571 580 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
Abstract Michalsen, K., Johannesen, E., and Bogstad, B. 2008. Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten. – ICES Journal of Marine Science, 65: 571–580. Many authors state that cod (Gadus morhua) do not feed during the spawning period. However, this more or less established fact has rarely been investigated in the field. Here, the content of stomachs from Northeast Arctic cod (NEAC) and Norwegian coastal cod (NCC) sampled from the spawning ground in Lofoten were examined over a 10-year period (1996–2006). The occurrence of food in the stomachs of spawning cod, stomach fullness, diet composition, and variation in these variables between NEAC and NCC, year, and sex were analysed and compared. The analysis shows that cod do feed, even when they are in a spawning state. NCC had a lower proportion of empty stomachs and the stomachs were fuller than those from NEAC. Females had a lower proportion of empty stomachs than males and their stomachs were in general fuller. Herring (Clupea harengus) dominated the diet of cod. However, cod consumption of herring on the spawning grounds seems to be a minor source of mortality on herring. Although spawning cod do feed, the proportion of empty stomachs was higher and stomach fullness was lower than in stomachs of NEAC from the Barents Sea. |
format |
Article in Journal/Newspaper |
author |
Michalsen, Kathrine Johannesen, Edda Bogstad, Bjarte |
spellingShingle |
Michalsen, Kathrine Johannesen, Edda Bogstad, Bjarte Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
author_facet |
Michalsen, Kathrine Johannesen, Edda Bogstad, Bjarte |
author_sort |
Michalsen, Kathrine |
title |
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
title_short |
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
title_full |
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
title_fullStr |
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
title_full_unstemmed |
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
title_sort |
feeding of mature cod (gadus morhua) on the spawning grounds in lofoten |
publisher |
Oxford University Press (OUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1093/icesjms/fsn019 http://academic.oup.com/icesjms/article-pdf/65/4/571/29129769/fsn019.pdf |
genre |
Arctic cod Barents Sea Gadus morhua Lofoten Northeast Arctic cod |
genre_facet |
Arctic cod Barents Sea Gadus morhua Lofoten Northeast Arctic cod |
op_source |
ICES Journal of Marine Science volume 65, issue 4, page 571-580 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1093/icesjms/fsn019 |
container_title |
ICES Journal of Marine Science |
container_volume |
65 |
container_issue |
4 |
container_start_page |
571 |
op_container_end_page |
580 |
_version_ |
1810294491694759936 |