Fate of discards from deep water crustacean trawl fishery off the south coast of Portugal

Castro, Margarida; Araújo, Artur; Monteiro, Pedro

Publication

Fate of discards from deep water crustacean trawl fishery off the south coast of Portugal

2005Journal article

dc.contributor.author	Castro, Margarida
dc.contributor.author	Araújo, Artur
dc.contributor.author	Monteiro, Pedro
dc.date.accessioned	2017-01-19T10:59:57Z
dc.date.available	2017-01-19T10:59:57Z
dc.date.issued	2005
dc.description.abstract	Trawling for crustaceans takes place on the south coast of Portugal at depths between 200 and 800 m. Large amounts of discards are released back to sea, reaching the bottom in the general area where trawling occurs. The objective of this work was to study the time taken for decomposition of the discards, to identify the most important scavenging species involved, and to evaluate the impact on the species targeted by the fishery. We conducted a series of 22 trials, using traps baited with samples of the discards. The time of immersion varied between 1 and 40 h. The amount of tissue removed from the discards was evaluated on a qualitative scale of 1–3, and quantitatively. The species caught in the traps were identified. Considerable consumption of the bait had occurred after 5 h of immersion. After 24 h of immersion only fish bones were left; past 40 h, consumption was complete. The conger eel (Conger conger) was the most common fish species present in the traps. Two species, the amphipod Scopelocheirus hopei and the isopod Natatolana (Cirolana) borealis, were identified as most important for the recycling of organic matter in the system. The stomach contents of a sample of species caught in trawls were analysed for the presence of small scavengers. Preliminary results show that S. hopei and N. (C.) borealis are part of the diet of some of the target species of this fishery, such as the Norway lobster, Nephrops norvegicus and the rose shrimp Parapenaeus longirostris.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.issn	0028-8330
dc.identifier.other	AUT: MCA00514;
dc.identifier.uri	http://hdl.handle.net/10400.1/8959
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Royal Society of New Zealand	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Fate of discards	pt_PT
dc.subject	Food subsidies	pt_PT
dc.subject	Impact of trawling	pt_PT
dc.title	Fate of discards from deep water crustacean trawl fishery off the south coast of Portugal	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	446	pt_PT
oaire.citation.startPage	437	pt_PT
oaire.citation.title	New Zealand Journal of Marine and Freshwater Research	pt_PT
oaire.citation.volume	39	pt_PT
person.familyName	Castro
person.familyName	Monteiro
person.givenName	Margarida
person.givenName	Pedro
person.identifier.ciencia-id	971F-AF68-5799
person.identifier.orcid	0000-0002-7860-2074
person.identifier.orcid	0000-0003-1446-8256
person.identifier.rid	N-1091-2013
person.identifier.rid	D-4995-2009
person.identifier.scopus-author-id	7402292554
rcaap.rights	restrictedAccess	pt_PT
rcaap.type	article	pt_PT
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relation.isAuthorOfPublication	4c74d67f-e46c-4536-81d5-27a047133d95
relation.isAuthorOfPublication.latestForDiscovery	76e4cab8-f3b7-4b85-b830-06599975ed40