Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic
<qd> Goetz, S., Laporta, M., Martínez Portela, J., Santos, M. B., and Pierce, G. J. Experimental fishing with an “umbrella-and-stones” system to reduce interactions of sperm whales ( Physeter macrocephalus ) and seabirds with bottom-set longlines for Patagonian toothfish ( Dissostichus elegino...
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Oxford University Press
2010
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Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/fsq161v1 https://doi.org/10.1093/icesjms/fsq161 |
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fthighwire:oai:open-archive.highwire.org:icesjms:fsq161v1 2023-05-15T17:54:43+02:00 Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic Goetz, Sabine Laporta, Martín Martínez Portela, Julio Santos, M. Begoña Pierce, Graham J. 2010-11-11 00:33:02.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/fsq161v1 https://doi.org/10.1093/icesjms/fsq161 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/fsq161v1 http://dx.doi.org/10.1093/icesjms/fsq161 Copyright (C) 2010, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Article TEXT 2010 fthighwire https://doi.org/10.1093/icesjms/fsq161 2013-05-26T22:46:52Z <qd> Goetz, S., Laporta, M., Martínez Portela, J., Santos, M. B., and Pierce, G. J. Experimental fishing with an “umbrella-and-stones” system to reduce interactions of sperm whales ( Physeter macrocephalus ) and seabirds with bottom-set longlines for Patagonian toothfish ( Dissostichus eleginoides ) in the Southwest Atlantic. – ICES Journal of Marine Science, doi:10.1093/icesjms/fsq161. </qd>Depredation, i.e. the damage or removal, of Patagonian toothfish ( Dissostichus eleginoides ) from longlines by sperm whales ( Physeter macrocephalus ) can cause considerable economic loss for Spanish fishing vessels in the Southwest Atlantic. The fishery also suffers high bycatch rates of seabirds. The main goal of the study was to assess the extent of depredation and seabird bycatch and to test the potential of the so-called “umbrella” system, coupled with attached stones for faster sinking, for minimizing both. Moreover, we investigated the relationships between sightings of sperm whales, depredation, catches, and environmental variables using generalized additive modelling. Data were collected during 297 hauls on a longliner in 2007/2008 in international waters of the Southwest Atlantic. Sperm whales were sighted during 35% of the hauls, always during gear retrieval, and their presence was positively related to fish damage. The overall depredation rate (0.44% of the total catch) was low, but is assumed to be underestimated because sperm whales were suspected of also taking fish without leaving visual evidence. The “umbrella-and-stones” system was highly effective in preventing bycatch and appeared to restrict depredation, but significantly reduced the catches. The results demonstrate that there is still some way to go to solve the problem of depredation. Text Patagonian Toothfish Physeter macrocephalus HighWire Press (Stanford University) Martínez ENVELOPE(-62.183,-62.183,-64.650,-64.650) ICES Journal of Marine Science 68 1 228 238 |
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HighWire Press (Stanford University) |
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fthighwire |
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English |
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Article Goetz, Sabine Laporta, Martín Martínez Portela, Julio Santos, M. Begoña Pierce, Graham J. Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
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Article |
description |
<qd> Goetz, S., Laporta, M., Martínez Portela, J., Santos, M. B., and Pierce, G. J. Experimental fishing with an “umbrella-and-stones” system to reduce interactions of sperm whales ( Physeter macrocephalus ) and seabirds with bottom-set longlines for Patagonian toothfish ( Dissostichus eleginoides ) in the Southwest Atlantic. – ICES Journal of Marine Science, doi:10.1093/icesjms/fsq161. </qd>Depredation, i.e. the damage or removal, of Patagonian toothfish ( Dissostichus eleginoides ) from longlines by sperm whales ( Physeter macrocephalus ) can cause considerable economic loss for Spanish fishing vessels in the Southwest Atlantic. The fishery also suffers high bycatch rates of seabirds. The main goal of the study was to assess the extent of depredation and seabird bycatch and to test the potential of the so-called “umbrella” system, coupled with attached stones for faster sinking, for minimizing both. Moreover, we investigated the relationships between sightings of sperm whales, depredation, catches, and environmental variables using generalized additive modelling. Data were collected during 297 hauls on a longliner in 2007/2008 in international waters of the Southwest Atlantic. Sperm whales were sighted during 35% of the hauls, always during gear retrieval, and their presence was positively related to fish damage. The overall depredation rate (0.44% of the total catch) was low, but is assumed to be underestimated because sperm whales were suspected of also taking fish without leaving visual evidence. The “umbrella-and-stones” system was highly effective in preventing bycatch and appeared to restrict depredation, but significantly reduced the catches. The results demonstrate that there is still some way to go to solve the problem of depredation. |
format |
Text |
author |
Goetz, Sabine Laporta, Martín Martínez Portela, Julio Santos, M. Begoña Pierce, Graham J. |
author_facet |
Goetz, Sabine Laporta, Martín Martínez Portela, Julio Santos, M. Begoña Pierce, Graham J. |
author_sort |
Goetz, Sabine |
title |
Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
title_short |
Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
title_full |
Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
title_fullStr |
Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
title_full_unstemmed |
Experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (Physeter macrocephalus) and seabirds with bottom-set longlines for Patagonian toothfish (Dissostichus eleginoides) in the Southwest Atlantic |
title_sort |
experimental fishing with an "umbrella-and-stones" system to reduce interactions of sperm whales (physeter macrocephalus) and seabirds with bottom-set longlines for patagonian toothfish (dissostichus eleginoides) in the southwest atlantic |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/fsq161v1 https://doi.org/10.1093/icesjms/fsq161 |
long_lat |
ENVELOPE(-62.183,-62.183,-64.650,-64.650) |
geographic |
Martínez |
geographic_facet |
Martínez |
genre |
Patagonian Toothfish Physeter macrocephalus |
genre_facet |
Patagonian Toothfish Physeter macrocephalus |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/fsq161v1 http://dx.doi.org/10.1093/icesjms/fsq161 |
op_rights |
Copyright (C) 2010, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/fsq161 |
container_title |
ICES Journal of Marine Science |
container_volume |
68 |
container_issue |
1 |
container_start_page |
228 |
op_container_end_page |
238 |
_version_ |
1766162516014006272 |