Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish
Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 19921997 is estimated using cod stomach content data. We present a new approach to the problem of estimating consumption by fish. The ne...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2004
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f03-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-168 |
id |
crcansciencepubl:10.1139/f03-168 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f03-168 2023-12-17T10:23:48+01:00 Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish Johansen, Geir Odd Bogstad, Bjarte Mehl, Sigbjørn Ulltang, Øyvind 2004 http://dx.doi.org/10.1139/f03-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-168 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 3, page 343-359 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2004 crcansciencepubl https://doi.org/10.1139/f03-168 2023-11-19T13:39:12Z Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 19921997 is estimated using cod stomach content data. We present a new approach to the problem of estimating consumption by fish. The new method is based on the estimation of digestion time for single prey items based on the difference between fresh weight at ingestion and weight in the stomach at time of sampling. Estimation is based on a gastric evacuation model for cod and area-specific sea temperatures. This is used to estimate the time (t max ) it takes for a prey to become digested to a stage where length is no longer measurable. Predation rate is then estimated for all prey with digestion time ≤t max as number of prey eaten in the time range defined by t max . This rate is combined with estimates of the proportion of the cod stock consuming the prey and area-specific abundance of cod, giving consumption of herring on a seasonal and yearly basis. The consumption estimates differ from those obtained using current methods. Predation mortality of herring is estimated directly from the consumption estimates by combining them with acoustic herring abundance data. Article in Journal/Newspaper Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod Canadian Science Publishing (via Crossref) Arctic Barents Sea Canadian Journal of Fisheries and Aquatic Sciences 61 3 343 359 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Johansen, Geir Odd Bogstad, Bjarte Mehl, Sigbjørn Ulltang, Øyvind Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 19921997 is estimated using cod stomach content data. We present a new approach to the problem of estimating consumption by fish. The new method is based on the estimation of digestion time for single prey items based on the difference between fresh weight at ingestion and weight in the stomach at time of sampling. Estimation is based on a gastric evacuation model for cod and area-specific sea temperatures. This is used to estimate the time (t max ) it takes for a prey to become digested to a stage where length is no longer measurable. Predation rate is then estimated for all prey with digestion time ≤t max as number of prey eaten in the time range defined by t max . This rate is combined with estimates of the proportion of the cod stock consuming the prey and area-specific abundance of cod, giving consumption of herring on a seasonal and yearly basis. The consumption estimates differ from those obtained using current methods. Predation mortality of herring is estimated directly from the consumption estimates by combining them with acoustic herring abundance data. |
format |
Article in Journal/Newspaper |
author |
Johansen, Geir Odd Bogstad, Bjarte Mehl, Sigbjørn Ulltang, Øyvind |
author_facet |
Johansen, Geir Odd Bogstad, Bjarte Mehl, Sigbjørn Ulltang, Øyvind |
author_sort |
Johansen, Geir Odd |
title |
Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
title_short |
Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
title_full |
Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
title_fullStr |
Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
title_full_unstemmed |
Consumption of juvenile herring ( Clupea harengus ) by cod ( Gadus morhua ) in the Barents Sea: a new approach to estimating consumption in piscivorous fish |
title_sort |
consumption of juvenile herring ( clupea harengus ) by cod ( gadus morhua ) in the barents sea: a new approach to estimating consumption in piscivorous fish |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/f03-168 http://www.nrcresearchpress.com/doi/pdf/10.1139/f03-168 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Barents Sea Gadus morhua Northeast Arctic cod |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 61, issue 3, page 343-359 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f03-168 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
61 |
container_issue |
3 |
container_start_page |
343 |
op_container_end_page |
359 |
_version_ |
1785560403092176896 |