Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten
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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.516.7640 2023-05-15T14:30:28+02:00 Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten Kathrine Michalsen Edda Johannesen Bjarte Bogstad The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.516.7640 http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.516.7640 http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf herring mature cod spawning stomach contents text ftciteseerx 2016-01-08T09:54:29Z 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 pro-portion 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. Text Arctic cod Arctic Barents Sea Gadus morhua Lofoten Northeast Arctic cod Unknown Arctic Barents Sea Fuller ENVELOPE(162.350,162.350,-77.867,-77.867) Lofoten |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
herring mature cod spawning stomach contents |
spellingShingle |
herring mature cod spawning stomach contents Kathrine Michalsen Edda Johannesen Bjarte Bogstad Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten |
topic_facet |
herring mature cod spawning stomach contents |
description |
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 pro-portion 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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Kathrine Michalsen Edda Johannesen Bjarte Bogstad |
author_facet |
Kathrine Michalsen Edda Johannesen Bjarte Bogstad |
author_sort |
Kathrine Michalsen |
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 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.516.7640 http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf |
long_lat |
ENVELOPE(162.350,162.350,-77.867,-77.867) |
geographic |
Arctic Barents Sea Fuller Lofoten |
geographic_facet |
Arctic Barents Sea Fuller Lofoten |
genre |
Arctic cod Arctic Barents Sea Gadus morhua Lofoten Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Barents Sea Gadus morhua Lofoten Northeast Arctic cod |
op_source |
http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.516.7640 http://icesjms.oxfordjournals.org/content/65/4/571.full.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766304304369500160 |