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An experimental study of gill net and trammel net 'ghost fishing' off the Algarve (southern Portugal)

1997Journal article Open access
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dc.contributor.authorErzini, Karim
dc.contributor.authorMonteiro, C. C.
dc.contributor.authorRibeiro, J.
dc.contributor.authorSantos, M. N.
dc.contributor.authorGaspar, M.
dc.contributor.authorMonteiro, P.
dc.contributor.authorBorges, T. C.
dc.date.accessioned2016-12-14T16:22:21Z
dc.date.available2016-12-14T16:22:21Z
dc.date.issued1997
dc.description.abstractFour 100 m lengths of both monofilament gill nets and trammel nets were deployed at depths between 15 and 18 m off the coast of the Algarve (south of Portugal) between April 1995 and June 1996. The nets were set on a natural rocky bottom with one end cut loose to simulate lost nets. Changes in net structure (net height, effective fishing area, movement, colonisation, wear and tear) and their catches (species, sizes, numbers, and biomass) were monitored by divers. Similar patterns were observed in all the nets, with a sharp decrease in net height and effective fishing area, and an increase in visibility within the first few weeks. Net movement was negligible except in the case of interference from other fishing gears. Catch rates were initially comparable to normally fished gill nets and trammel nets in this area, but decreased steadily over time. No sea birds, reptiles or mammals were caught in any of the 8 nets. Catches were dominated by fish (89 % by number, at least 27 species), in particular by sea breams (Sparidae) and wrasses (Labridae). Under the conditions experienced throughout the study the fishing Lifetime of a 'lost' net is between 15 and 20 wk. Based on an exponential model, we estimated that 100 m lengths of gill net and trammel net will catch 314 and 221 fish respectively over a 17 wk period. However, we consider this to be an underestimate due to high rates of predation and scavenging by octopuses, cuttlefish, moray eels, conger eels, and other fish such as the wrasse Coris julis. When the nets were surveyed in the following spring, 8 to 11 mo after being deployed, they were found to be completely destroyed or heavily colonised by algae and had become incorporated into the reef.
dc.identifier.doi10.3354/meps158257
dc.identifier.issn0171-8630
dc.identifier.otherAUT: KER00543;
dc.identifier.urihttp://hdl.handle.net/10400.1/8767
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter Research
dc.relation.isbasedonWOS:A1997YK60700024
dc.titleAn experimental study of gill net and trammel net 'ghost fishing' off the Algarve (southern Portugal)
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage265
oaire.citation.startPage257
oaire.citation.titleMarine Ecology Progress Series
oaire.citation.volume158
person.familyNameErzini
person.familyNameMonteiro
person.familyNameBorges
person.givenNameKarim
person.givenNamePedro
person.givenNameTeresa Cerveira
person.identifier.ciencia-idD917-7133-341A
person.identifier.ciencia-id5A1E-E8AD-3E24
person.identifier.orcid0000-0002-1411-0126
person.identifier.orcid0000-0003-1446-8256
person.identifier.orcid0000-0002-6414-0083
person.identifier.ridM-5216-2013
person.identifier.ridD-4995-2009
person.identifier.ridM-3388-2013
person.identifier.scopus-author-id7004015948
person.identifier.scopus-author-id6604001208
rcaap.rightsopenAccess
rcaap.typearticle
relation.isAuthorOfPublicatione20f0e2d-3085-4c37-9e98-260dc9faddea
relation.isAuthorOfPublication4c74d67f-e46c-4536-81d5-27a047133d95
relation.isAuthorOfPublication7975c9b8-d25a-4bec-91f4-d1193a8e8082
relation.isAuthorOfPublication.latestForDiscoverye20f0e2d-3085-4c37-9e98-260dc9faddea

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