Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994
Within the framework of a European Union (UE) contract and with voluntary participation of commercial fishing vessels, a discard sampling programme based on stratified random sampling by fisheries covered the activities of trawl and long line Spanish fleets fishing in ICES Subarea VII in 1994. Disca...
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ftcsic:oai:digital.csic.es:10261/327696 2024-02-11T10:05:21+01:00 Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 Pérez-Contreras, María Nélida Trujillo-Gorbea, Valentín Pereda, Pilar Atlantic Ocean Reykjavík (Islandia) North Atlantic Northeast Atlantic ICES 1996 http://hdl.handle.net/10508/8862 http://hdl.handle.net/10261/327696 en eng Centro Oceanográfico de Vigo ICES Annual Science Conference. (27/09/1996 - 04/10/1996. Reykjavik (Iceland)). 1996. C.M. 1996/Mini:8 http://hdl.handle.net/10508/8862 http://hdl.handle.net/10261/327696 20641 open Centro Oceanográfico de Vigo Pesquerías documento de trabajo http://purl.org/coar/resource_type/c_8042 1996 ftcsic 2024-01-16T11:49:05Z Within the framework of a European Union (UE) contract and with voluntary participation of commercial fishing vessels, a discard sampling programme based on stratified random sampling by fisheries covered the activities of trawl and long line Spanish fleets fishing in ICES Subarea VII in 1994. Discards of commercial and non-commercial species, including species of pinnipeds, cetaceans, sea turtles and sea birds, caught incidentally were estimated in kg per fishing hour by ICES rectangle and depth stratum in 1994. The sampling programme was carried out by observers on board commercial fishing vessels during normal fishing activity. A total of 238 species caught by trawlers and 76 by long liners were determined. The comparison of the two fleets regarding their ratios of discards in 1994 shows that the larger percentages of discards relative to total catches are found in the trawl fisheries (48%) and around 50% are primarily due to the discards of three species of fish and one of crustacea. Seasonal variation in the case of discards of the two main species (Great Silver Smelt and Horse Mackerei) was observed. The depth at which discards were hig lies between 200 and 400m. Conversely, long line fishing in Subarea VII shows a lower discard rate than that of trawlers (10%). Approximately 60% of discards primarily comprise two species of fish, Blue Whiting and Great Silver Smelt, both of which show the highest discard value per f.h. in the 3rd quarter. No differences were observed by depth strata. Report Islandia North Atlantic Northeast Atlantic Reykjavík Reykjavík Digital.CSIC (Spanish National Research Council) Reykjavík |
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Digital.CSIC (Spanish National Research Council) |
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language |
English |
topic |
Centro Oceanográfico de Vigo Pesquerías |
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Centro Oceanográfico de Vigo Pesquerías Pérez-Contreras, María Nélida Trujillo-Gorbea, Valentín Pereda, Pilar Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
topic_facet |
Centro Oceanográfico de Vigo Pesquerías |
description |
Within the framework of a European Union (UE) contract and with voluntary participation of commercial fishing vessels, a discard sampling programme based on stratified random sampling by fisheries covered the activities of trawl and long line Spanish fleets fishing in ICES Subarea VII in 1994. Discards of commercial and non-commercial species, including species of pinnipeds, cetaceans, sea turtles and sea birds, caught incidentally were estimated in kg per fishing hour by ICES rectangle and depth stratum in 1994. The sampling programme was carried out by observers on board commercial fishing vessels during normal fishing activity. A total of 238 species caught by trawlers and 76 by long liners were determined. The comparison of the two fleets regarding their ratios of discards in 1994 shows that the larger percentages of discards relative to total catches are found in the trawl fisheries (48%) and around 50% are primarily due to the discards of three species of fish and one of crustacea. Seasonal variation in the case of discards of the two main species (Great Silver Smelt and Horse Mackerei) was observed. The depth at which discards were hig lies between 200 and 400m. Conversely, long line fishing in Subarea VII shows a lower discard rate than that of trawlers (10%). Approximately 60% of discards primarily comprise two species of fish, Blue Whiting and Great Silver Smelt, both of which show the highest discard value per f.h. in the 3rd quarter. No differences were observed by depth strata. |
format |
Report |
author |
Pérez-Contreras, María Nélida Trujillo-Gorbea, Valentín Pereda, Pilar |
author_facet |
Pérez-Contreras, María Nélida Trujillo-Gorbea, Valentín Pereda, Pilar |
author_sort |
Pérez-Contreras, María Nélida |
title |
Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
title_short |
Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
title_full |
Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
title_fullStr |
Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
title_full_unstemmed |
Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994 |
title_sort |
discards of the trawl and long line spanish fleets in ices subarea vii in 1994 |
publishDate |
1996 |
url |
http://hdl.handle.net/10508/8862 http://hdl.handle.net/10261/327696 |
op_coverage |
Atlantic Ocean Reykjavík (Islandia) North Atlantic Northeast Atlantic ICES |
geographic |
Reykjavík |
geographic_facet |
Reykjavík |
genre |
Islandia North Atlantic Northeast Atlantic Reykjavík Reykjavík |
genre_facet |
Islandia North Atlantic Northeast Atlantic Reykjavík Reykjavík |
op_relation |
Centro Oceanográfico de Vigo ICES Annual Science Conference. (27/09/1996 - 04/10/1996. Reykjavik (Iceland)). 1996. C.M. 1996/Mini:8 http://hdl.handle.net/10508/8862 http://hdl.handle.net/10261/327696 20641 |
op_rights |
open |
_version_ |
1790602360253317120 |