Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina
We studied discard use and incidental mortality of seabirds attracted to high-sea trawl vessels operating in the Golfo San Jorge, Argentina, during the height of the fishing season in 2003 and 2004. Fourteen seabird species ate food made available by fishing operations. The most frequent and abundan...
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ftconicet:oai:ri.conicet.gov.ar:11336/16764 2023-10-09T21:55:15+02:00 Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina Gonzalez Zevallos, Diego Ricardo Yorio, Pablo Martin application/pdf http://hdl.handle.net/11336/16764 eng eng Inter-research info:eu-repo/semantics/altIdentifier/url/http://www.int-res.com/abstracts/meps/v316/p175-183/ http://hdl.handle.net/11336/16764 Gonzalez Zevallos, Diego Ricardo; Yorio, Pablo Martin; Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina; Inter-research; Marine Ecology Progress Series; 316; 3-7-2006; 175-183 0171-8630 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ SEABIRD-FISHERY INTERACTIONS DISCARDS INCIDENTAL MORTALITY TRAWL FISHERIES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet 2023-09-24T19:19:14Z We studied discard use and incidental mortality of seabirds attracted to high-sea trawl vessels operating in the Golfo San Jorge, Argentina, during the height of the fishing season in 2003 and 2004. Fourteen seabird species ate food made available by fishing operations. The most frequent and abundant seabirds (percent occurrence, mean number per haul) were the kelp gull Larus dominicanus (98.9%, 207.0), the black-browed albatross Thalassarche melanophrys (98.9%, 94.2) and the white-chinned petrel Procellaria aequinoctialis (91%, 8.4). Flock sizes for the 3 species var- ied from a few to a maximum of 1600 birds. Total seabird abundance varied significantly between stages of the fishing operation, being higher during discarding and haulback than during towing. Incidental capture of seabirds in nets was recorded in 37% of 89 hauls, with a mean capture rate of 1.2 birds per haul. Species incidentally caught were the great shearwater Puffinus gravis , the imper- ial cormorant Phalacrocorax atriceps and the Magellanic penguin Spheniscus magellanicus , with rates that varied between months and years. Considering the fishery’s fishing effort, the estimated total numbers of birds killed during the study were 2254 great shearwaters (CV = 1.1), 1233 imperial cormorants (CV = 1.1) and 35 Magellanic penguins (CV = 2.4) in 2003, and 311 imperial cormorants (CV = 1.7) and 1516 Magellanic penguins (CV = 1.1) in 2004. Black-browed albatrosses and kelp gulls were also struck by the warp cable while feeding on discards from the surface, and drowned when they were dragged underwater. The results obtained in this study show that the hake trawl fishery operating in the Golfo San Jorge may have a significant effect on some seabird populations through the provision of fishing discards and incidental mortality. Fil: Gonzalez Zevallos, Diego Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia; Argentina Fil: Yorio, Pablo Martin. Consejo ... Article in Journal/Newspaper Phalacrocorax atriceps CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Patagonia Argentina Argentine Hake ENVELOPE(15.612,15.612,66.797,66.797) Gonzalez ENVELOPE(-58.250,-58.250,-63.917,-63.917) Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Ricardo ENVELOPE(-63.033,-63.033,-64.867,-64.867) |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
SEABIRD-FISHERY INTERACTIONS DISCARDS INCIDENTAL MORTALITY TRAWL FISHERIES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
SEABIRD-FISHERY INTERACTIONS DISCARDS INCIDENTAL MORTALITY TRAWL FISHERIES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Gonzalez Zevallos, Diego Ricardo Yorio, Pablo Martin Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
topic_facet |
SEABIRD-FISHERY INTERACTIONS DISCARDS INCIDENTAL MORTALITY TRAWL FISHERIES https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
We studied discard use and incidental mortality of seabirds attracted to high-sea trawl vessels operating in the Golfo San Jorge, Argentina, during the height of the fishing season in 2003 and 2004. Fourteen seabird species ate food made available by fishing operations. The most frequent and abundant seabirds (percent occurrence, mean number per haul) were the kelp gull Larus dominicanus (98.9%, 207.0), the black-browed albatross Thalassarche melanophrys (98.9%, 94.2) and the white-chinned petrel Procellaria aequinoctialis (91%, 8.4). Flock sizes for the 3 species var- ied from a few to a maximum of 1600 birds. Total seabird abundance varied significantly between stages of the fishing operation, being higher during discarding and haulback than during towing. Incidental capture of seabirds in nets was recorded in 37% of 89 hauls, with a mean capture rate of 1.2 birds per haul. Species incidentally caught were the great shearwater Puffinus gravis , the imper- ial cormorant Phalacrocorax atriceps and the Magellanic penguin Spheniscus magellanicus , with rates that varied between months and years. Considering the fishery’s fishing effort, the estimated total numbers of birds killed during the study were 2254 great shearwaters (CV = 1.1), 1233 imperial cormorants (CV = 1.1) and 35 Magellanic penguins (CV = 2.4) in 2003, and 311 imperial cormorants (CV = 1.7) and 1516 Magellanic penguins (CV = 1.1) in 2004. Black-browed albatrosses and kelp gulls were also struck by the warp cable while feeding on discards from the surface, and drowned when they were dragged underwater. The results obtained in this study show that the hake trawl fishery operating in the Golfo San Jorge may have a significant effect on some seabird populations through the provision of fishing discards and incidental mortality. Fil: Gonzalez Zevallos, Diego Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia; Argentina Fil: Yorio, Pablo Martin. Consejo ... |
format |
Article in Journal/Newspaper |
author |
Gonzalez Zevallos, Diego Ricardo Yorio, Pablo Martin |
author_facet |
Gonzalez Zevallos, Diego Ricardo Yorio, Pablo Martin |
author_sort |
Gonzalez Zevallos, Diego Ricardo |
title |
Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
title_short |
Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
title_full |
Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
title_fullStr |
Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
title_full_unstemmed |
Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina |
title_sort |
seabird use of discards and incidental captures at the argentine hake trawl fishery in the golfo san jorge, argentina |
publisher |
Inter-research |
url |
http://hdl.handle.net/11336/16764 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) ENVELOPE(-58.250,-58.250,-63.917,-63.917) ENVELOPE(-63.717,-63.717,-64.283,-64.283) ENVELOPE(-63.033,-63.033,-64.867,-64.867) |
geographic |
Patagonia Argentina Argentine Hake Gonzalez Pablo Ricardo |
geographic_facet |
Patagonia Argentina Argentine Hake Gonzalez Pablo Ricardo |
genre |
Phalacrocorax atriceps |
genre_facet |
Phalacrocorax atriceps |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://www.int-res.com/abstracts/meps/v316/p175-183/ http://hdl.handle.net/11336/16764 Gonzalez Zevallos, Diego Ricardo; Yorio, Pablo Martin; Seabird use of discards and incidental captures at the Argentine hake trawl fishery in the Golfo San Jorge, Argentina; Inter-research; Marine Ecology Progress Series; 316; 3-7-2006; 175-183 0171-8630 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
_version_ |
1779319109228429312 |