Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994.
The diet composition of the icefish Champsocephalus gunnari caught around the South Georgia Islands and Shag Rocks, Atlantic sector of Antacrtica in February/March 1994 was analyzed using the frequency of occurrence (. ) method. Krill Euphausia superba followed by the hyperiid amphipod Themisto gaud...
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Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
1997
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ftoceandocs:oai:aquadocs.org:1834/1931 2024-06-09T07:45:47+00:00 Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. Composición de la dieta Champsocephalus gunnari (Pisces,Channichthyidae)en las Islas Georgias del Sur, campaña de investigación BIP Dr.Eduardo Holmberg, febrero/marzo 1994. Barrera-Oro, E. Casaux, R. Roux, A. Atlántico Sudoccidental, Argentina, Islas Georgias del Sur 1997 http://hdl.handle.net/1834/1931 en eng Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) Revista de Investigación y Desarrollo Pesquero, 11. p. 53-62 0325-6375 http://hdl.handle.net/1834/1931 Feeding Food preferences Stomach content Fishery surveys Journal Contribution 1997 ftoceandocs 2024-05-15T08:02:16Z The diet composition of the icefish Champsocephalus gunnari caught around the South Georgia Islands and Shag Rocks, Atlantic sector of Antacrtica in February/March 1994 was analyzed using the frequency of occurrence (. ) method. Krill Euphausia superba followed by the hyperiid amphipod Themisto gaudichaudii were the main prey items at South Georgia and Shag Rocks; first were found in thestomachs more frequently than in past seasons around South Georgia,in parallel with the virtual absence of mysids and Thysanoessaspp. Krill was available for fish at the same level than in previous years (e.g. 1985, 1992). However, high proportion of empty stomachs were found at South Georgia and Shag Rocks, close to the values reported for the 1991 year of krill 'shortage'. Besides, the tentative analysis of part of the samples using coefficient Q (. )showed a greater importance of T.gaudichaudii with respect to krill.It is possible that the inconsistencies found between the results obtained by both methods are due to a particular spatial distribution of krill in the area in the period of study, but no previous data are available for comparison. No krill aggregations were found in the region by acoustic methods in the 1994 summer season; a fact that might be related to a significant change in surface temperature observed during the cruise. Publisher permission Published Channichthyidae, Champsocephalus gunnari, Pez de hielo, relevamientos pesqueros, contenido estomacal, alimentación, preferencias alimenticias Article in Journal/Newspaper Euphausia superba Icefish IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Argentina Argentina islas ENVELOPE(-64.273,-64.273,-65.246,-65.246) Hielo ENVELOPE(-58.133,-58.133,-62.083,-62.083) Shag Rocks ENVELOPE(-42.033,-42.033,-53.550,-53.550) |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Feeding Food preferences Stomach content Fishery surveys |
spellingShingle |
Feeding Food preferences Stomach content Fishery surveys Barrera-Oro, E. Casaux, R. Roux, A. Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
topic_facet |
Feeding Food preferences Stomach content Fishery surveys |
description |
The diet composition of the icefish Champsocephalus gunnari caught around the South Georgia Islands and Shag Rocks, Atlantic sector of Antacrtica in February/March 1994 was analyzed using the frequency of occurrence (. ) method. Krill Euphausia superba followed by the hyperiid amphipod Themisto gaudichaudii were the main prey items at South Georgia and Shag Rocks; first were found in thestomachs more frequently than in past seasons around South Georgia,in parallel with the virtual absence of mysids and Thysanoessaspp. Krill was available for fish at the same level than in previous years (e.g. 1985, 1992). However, high proportion of empty stomachs were found at South Georgia and Shag Rocks, close to the values reported for the 1991 year of krill 'shortage'. Besides, the tentative analysis of part of the samples using coefficient Q (. )showed a greater importance of T.gaudichaudii with respect to krill.It is possible that the inconsistencies found between the results obtained by both methods are due to a particular spatial distribution of krill in the area in the period of study, but no previous data are available for comparison. No krill aggregations were found in the region by acoustic methods in the 1994 summer season; a fact that might be related to a significant change in surface temperature observed during the cruise. Publisher permission Published Channichthyidae, Champsocephalus gunnari, Pez de hielo, relevamientos pesqueros, contenido estomacal, alimentación, preferencias alimenticias |
format |
Article in Journal/Newspaper |
author |
Barrera-Oro, E. Casaux, R. Roux, A. |
author_facet |
Barrera-Oro, E. Casaux, R. Roux, A. |
author_sort |
Barrera-Oro, E. |
title |
Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
title_short |
Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
title_full |
Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
title_fullStr |
Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
title_full_unstemmed |
Diet composition of Champsocephalus gunnari (Pisces,Channichthyidae)around South Georgia Islands, R/V Dr. Eduardo L.Holmberg survey, February/March 1994. |
title_sort |
diet composition of champsocephalus gunnari (pisces,channichthyidae)around south georgia islands, r/v dr. eduardo l.holmberg survey, february/march 1994. |
publisher |
Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) |
publishDate |
1997 |
url |
http://hdl.handle.net/1834/1931 |
op_coverage |
Atlántico Sudoccidental, Argentina, Islas Georgias del Sur |
long_lat |
ENVELOPE(-64.273,-64.273,-65.246,-65.246) ENVELOPE(-58.133,-58.133,-62.083,-62.083) ENVELOPE(-42.033,-42.033,-53.550,-53.550) |
geographic |
Argentina Argentina islas Hielo Shag Rocks |
geographic_facet |
Argentina Argentina islas Hielo Shag Rocks |
genre |
Euphausia superba Icefish |
genre_facet |
Euphausia superba Icefish |
op_relation |
Revista de Investigación y Desarrollo Pesquero, 11. p. 53-62 0325-6375 http://hdl.handle.net/1834/1931 |
_version_ |
1801375357644832768 |