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
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...
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Language: | English |
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2011
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ftopenagrar:oai:www.openagrar.de:timport_mods_00029914 2024-09-15T18:29:10+00:00 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, Martin Portela. Julio M. Begona Santos, Maria Pierce, Graham J. 2011 10 https://doi.org/10.1093/icesjms/fsq161 https://www.openagrar.de/receive/timport_mods_00029914 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029914/dn053707.pdf eng eng ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsq161 https://www.openagrar.de/receive/timport_mods_00029914 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029914/dn053707.pdf only signed in user info:eu-repo/semantics/restrictedAccess article Text depredation longline Patagonian toothfish sperm whale umbrella system article Text doc-type:article 2011 ftopenagrar https://doi.org/10.1093/icesjms/fsq161 2024-07-08T23:56:24Z 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. Article in Journal/Newspaper Patagonian Toothfish Physeter macrocephalus Sperm whale OpenAgrar (OA) ICES Journal of Marine Science 68 1 228 238 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
article Text depredation longline Patagonian toothfish sperm whale umbrella system |
spellingShingle |
article Text depredation longline Patagonian toothfish sperm whale umbrella system Goetz, Sabine Laporta, Martin Portela. Julio M. Begona Santos, Maria 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 |
topic_facet |
article Text depredation longline Patagonian toothfish sperm whale umbrella system |
description |
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 |
Article in Journal/Newspaper |
author |
Goetz, Sabine Laporta, Martin Portela. Julio M. Begona Santos, Maria Pierce, Graham J. |
author_facet |
Goetz, Sabine Laporta, Martin Portela. Julio M. Begona Santos, Maria 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 |
publishDate |
2011 |
url |
https://doi.org/10.1093/icesjms/fsq161 https://www.openagrar.de/receive/timport_mods_00029914 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029914/dn053707.pdf |
genre |
Patagonian Toothfish Physeter macrocephalus Sperm whale |
genre_facet |
Patagonian Toothfish Physeter macrocephalus Sperm whale |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsq161 https://www.openagrar.de/receive/timport_mods_00029914 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00029914/dn053707.pdf |
op_rights |
only signed in user info:eu-repo/semantics/restrictedAccess |
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_ |
1810470576497623040 |