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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ftcsic:oai:digital.csic.es:10261/329213 2024-02-11T10:06:24+01:00 Factors affecting discards by the coastal Spanish North Atlantic trawlers Trujillo-Gorbea, Valentín Pérez-Contreras, María Nélida Pereda, Pilar Baltimore (USA) Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters 1997 http://hdl.handle.net/10508/8885 http://hdl.handle.net/10261/329213 en eng Centro Oceanográfico de Vigo ICES Annual Science Conference. (25/09/1997 - 30/09/1997. Baltimore (USA)). 1997. C.M. 1997/DD:03. En: , . http://hdl.handle.net/10508/8885 http://hdl.handle.net/10261/329213 20658 open Discard Pesquerías Centro Oceanográfico de Vigo Iberian Peninsula Trawl conference output 1997 ftcsic 2024-01-16T11:49:41Z 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 Digital.CSIC (Spanish National Research Council) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Discard Pesquerías Centro Oceanográfico de Vigo Iberian Peninsula Trawl |
spellingShingle |
Discard Pesquerías Centro Oceanográfico de Vigo Iberian Peninsula Trawl Trujillo-Gorbea, Valentín Pérez-Contreras, María Nélida Pereda, Pilar Factors affecting discards by the coastal Spanish North Atlantic trawlers |
topic_facet |
Discard Pesquerías Centro Oceanográfico de Vigo 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, Valentín Pérez-Contreras, María Nélida Pereda, Pilar |
author_facet |
Trujillo-Gorbea, Valentín Pérez-Contreras, María Nélida Pereda, Pilar |
author_sort |
Trujillo-Gorbea, 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 |
publishDate |
1997 |
url |
http://hdl.handle.net/10508/8885 http://hdl.handle.net/10261/329213 |
op_coverage |
Baltimore (USA) Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
Centro Oceanográfico de Vigo ICES Annual Science Conference. (25/09/1997 - 30/09/1997. Baltimore (USA)). 1997. C.M. 1997/DD:03. En: , . http://hdl.handle.net/10508/8885 http://hdl.handle.net/10261/329213 20658 |
op_rights |
open |
_version_ |
1790604107684249600 |