Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/6793
Título: Bycatch and discards of commercial trawl fisheries in the south coast of Portugal
Autor: Costa, Maria Esmeralda de Sá Leite Correia da
Orientador: Borges, Teresa Cerveira
Palavras-chave: Biologia pesqueira
Biodiversidade
Recursos marinhos
Pesca comercial
Pesca de arrasto
Data de Defesa: 2014
Resumo: Bycatch and discards are a cause of great concern in commercial world fisheries, with important ecological, economic and conservation implications. With the recent inclusion of a discards ban (‘landing obligation’), in the reform of the EU CFP, these issues have gained a tremendous attention from the economic, scientific, political and social point of view. Demersal trawl fisheries off the southern coast of Portugal capture an extraordinary diversity of species and generate considerable amounts of bycatch and discards. Bycatch includes commercially valuable target-species and bycatch species with low or no commercial value, but the great majority consists of unmarketable species, that are discarded. Bony fishes are dominant in bycatch and discards and the most discarded are of low or no commercial value. The reasons for discarding are fundamentally economic in nature (lack of commercial value) for bycatch species, and legal and administrative (legal minimum landing size) for commercially important species. The study of the reproductive biology of Galeus melastomus, discarded by crustacean trawls, suggests that a minimum landing size should be established for this species, and explains the importance of such a study in the assessment and management of fisheries. The discovery of a new species of the ray Neoraja iberica n. sp. contributes to the knowledge of the local marine biodiversity in Portuguese waters and of the global marine biodiversity. The three cases of abnormal hermaphroditism recorded in Etmopterus spinax, are the first cases known to date of hermaphroditism in this species. There is a need to find solutions to the problem of bycatch and discards of trawl fisheries in the Algarve coast. A combination of technical, regulatory and economic measures to minimize bycatch and reduce discards, before implementing a ‘landing obligation’, is thought to be the best approach to apply in the southern Portuguese multispecies trawl fisheries.
URI: http://hdl.handle.net/10400.1/6793
Designação: Doutoramento em Ciências e Tecnologias das Pescas (Biologia Pesqueira)
Aparece nas colecções:UA01-Teses

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MECOSTA PhD Thesis 2014.pdf17,33 MBAdobe PDFVer/Abrir
MECosta PhD Thesis 2014_Errata.pdf85,63 kBAdobe PDFVer/Abrir
ANNEX I.pdf436,61 kBAdobe PDFVer/Abrir
ANNEX II.pdf406,56 kBAdobe PDFVer/Abrir
ANNEX II_Errata.pdf1,12 MBAdobe PDFVer/Abrir
ANNEX III.pdf88,22 kBAdobe PDFVer/Abrir
ANNEX IV.pdf43,86 kBAdobe PDFVer/Abrir
ANNEX V.pdf38,4 kBAdobe PDFVer/Abrir
ANNEX VI.pdf56,91 kBAdobe PDFVer/Abrir
ANNEX VII.pdf49,84 kBAdobe PDFVer/Abrir
ANNEX VIII.pdf67,92 kBAdobe PDFVer/Abrir
ANNEX IX.pdf93,91 kBAdobe PDFVer/Abrir
ANNEX X.pdf78,09 kBAdobe PDFVer/Abrir
ANNEX XI.pdf16,1 kBAdobe PDFVer/Abrir
ANNEX XII.pdf21,17 kBAdobe PDFVer/Abrir
ANNEX XIII.pdf45,56 kBAdobe PDFVer/Abrir
ANNEX XIV.pdf21,36 kBAdobe PDFVer/Abrir
ANNEX XV.pdf42,88 kBAdobe PDFVer/Abrir
ANNEX XVI.pdf23,83 kBAdobe PDFVer/Abrir
ANNEX XVII.pdf52,26 kBAdobe PDFVer/Abrir
ANNEX XVIII.pdf1,38 MBAdobe PDFVer/Abrir
ANNEX XIX.pdf2,2 MBAdobe PDFVer/Abrir
ANNEX XX.pdf1,24 MBAdobe PDFVer/Abrir
ANNEX XXI.PDF8,24 MBAdobe PDFVer/Abrir


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