Factors affecting discards by the coastal Spanish North Atlantic trawlers
Variations in the total discard in weight were evaluated by Spanish trawler fleet operating in the North Atiantic Spanish coast in 1994. The data used for this study came from observers on board commercial fishing boats in ICES Divisions VIIIe and IXa during normal fishing activity. A total of 493 h...
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Centro Oceanográfico de Vigo
1997
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ftieo:oai:repositorio.ieo.es:10508/8885 2023-05-15T17:32:44+02:00 Factors affecting discards by the coastal Spanish North Atlantic trawlers Trujillo-Gorbea, V. (Valentín) Pérez-Contreras, M.N. (María Nélida) Pereda, P. (Pilar) Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters 1997 http://hdl.handle.net/10508/8885 eng eng Centro Oceanográfico de Vigo http://hdl.handle.net/10508/8885 ICES Annual Science Conference. (25/09/1997 - 30/09/1997. Baltimore (USA)). 1997. C.M. 1997/DD:03. En: , . Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Discard Iberian Peninsula Trawl conferenceObject 1997 ftieo 2022-07-26T23:48:37Z Variations in the total discard in weight were evaluated by Spanish trawler fleet operating in the North Atiantic Spanish coast in 1994. The data used for this study came from observers on board commercial fishing boats in ICES Divisions VIIIe and IXa during normal fishing activity. A total of 493 hauls were analysed and 221 commercial and non-commercial species discarded were determined. The response variable studied is the whole discard of all species per unit effort. A general analysis of covariance was carried out with the following sources of variation: trip, quarter, area, port, three types of gears, groups of boats (using multivariant analysis of classification) and as covariables: total eatch per unit effort, fishing hours, depth, tonnage, horsepower and length of the boats studied. The results show a great variation in the discard values by unit of effort for this fleet, except for the intra-annual variation. Conference Object North Atlantic Northeast Atlantic Instituto Español de Oceanografía: e-IEO |
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Open Polar |
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Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Discard Iberian Peninsula Trawl |
spellingShingle |
Discard Iberian Peninsula Trawl Trujillo-Gorbea, V. (Valentín) Pérez-Contreras, M.N. (María Nélida) Pereda, P. (Pilar) Factors affecting discards by the coastal Spanish North Atlantic trawlers |
topic_facet |
Discard Iberian Peninsula Trawl |
description |
Variations in the total discard in weight were evaluated by Spanish trawler fleet operating in the North Atiantic Spanish coast in 1994. The data used for this study came from observers on board commercial fishing boats in ICES Divisions VIIIe and IXa during normal fishing activity. A total of 493 hauls were analysed and 221 commercial and non-commercial species discarded were determined. The response variable studied is the whole discard of all species per unit effort. A general analysis of covariance was carried out with the following sources of variation: trip, quarter, area, port, three types of gears, groups of boats (using multivariant analysis of classification) and as covariables: total eatch per unit effort, fishing hours, depth, tonnage, horsepower and length of the boats studied. The results show a great variation in the discard values by unit of effort for this fleet, except for the intra-annual variation. |
format |
Conference Object |
author |
Trujillo-Gorbea, V. (Valentín) Pérez-Contreras, M.N. (María Nélida) Pereda, P. (Pilar) |
author_facet |
Trujillo-Gorbea, V. (Valentín) Pérez-Contreras, M.N. (María Nélida) Pereda, P. (Pilar) |
author_sort |
Trujillo-Gorbea, V. (Valentín) |
title |
Factors affecting discards by the coastal Spanish North Atlantic trawlers |
title_short |
Factors affecting discards by the coastal Spanish North Atlantic trawlers |
title_full |
Factors affecting discards by the coastal Spanish North Atlantic trawlers |
title_fullStr |
Factors affecting discards by the coastal Spanish North Atlantic trawlers |
title_full_unstemmed |
Factors affecting discards by the coastal Spanish North Atlantic trawlers |
title_sort |
factors affecting discards by the coastal spanish north atlantic trawlers |
publisher |
Centro Oceanográfico de Vigo |
publishDate |
1997 |
url |
http://hdl.handle.net/10508/8885 |
op_coverage |
Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
http://hdl.handle.net/10508/8885 ICES Annual Science Conference. (25/09/1997 - 30/09/1997. Baltimore (USA)). 1997. C.M. 1997/DD:03. En: , . |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766130982551814144 |