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Registros recuperados: 5
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Évolution de l'écosystème pélagique du Golfe de Gascogne pendant la période 1990-2003. Conséquences sur la capturabilité des espèces ArchiMer
Villalobos, Hector.
Several small pelagic fish species contribute remarkably to world catch. Their populations are, however, characterized by large biomass fluctuations strongly affecting fisheries. The fishing gears and methods used to capture small pelagics have evolved to exploit the highly developed shoaling behavior of these species. Hence, faced to modern fishing this gregarious behavior becomes a disadvantage for fish. Fish behavior may be affected by environmental conditions and by fishing, at the same time that behavior impacts fishing. In this study, we seek to characterize the aggregative systems of small pelagic fishes inhabiting the Bay of Biscay by analyzing "acoustic images", defined as the group of echoes (planktonic layers, shoals, isolated targets) detected...
Tipo: Text Palavras-chave: Biscay Bay; Hydrological landscapes; Fishery; Atlantic mackerel; Atlantic horse mackerel; European sardine; European anchovy; Small pelagic fish; Acoustic image; Agregation pattern; School descriptors; Golfe de Gascogne; Paysages hydrologiques; Pêcherie; Maquereau; Chinchard; Sardine; Anchois; Petits poissons pélagiques; Image acoustique; Type d'agrégation; Descripteurs de bancs.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6083.pdf
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Exploitation, biologie et dynamique du stock de langouste rouge de Corse, Palinurus elephas Fabricius ArchiMer
Marin, Jean.
The European red spiny lobster (Palinurus elephas) is the main target species of the small-scale fishery in Corsica. This fishery was described, its trends from 1981 to 1964 were analysed, and the exploitation conditions of the spiny lobster stock (fishing grounds, strategy and gear ; fishing regulations) were explained. Furthermore, the fishing effort and the yields were estimated through an indirect survey, in 1983 and 1984 . The growth was studied through tagging experiments. Growth increment per moult, Von BERTALANFFY's equation parameters, and moulting frequency were estimated for both sexes. Bias risks associated to tag loss at moulting were also analysed. In addition, estimates of K and L∞ variances were provided through "Jack-knife"...
Tipo: Text Palavras-chave: Palinurus elephas; Fishery biology; Population dynamics; Fecundity; Recruitment; Sexual maturity; Growth; Stock assessment; Sensibilité; Fécondité par recrue; Rendement par recrue; Analyse des cohortes; Maturité sexuelle; Croissance; Pêcherie; Langouste.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/these-1036.pdf
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Incidences des épisodes d'efflorescences de micro algues toxiques sur les écosystèmes et sur les pêcheries de coquillages en baie de Douarnenez ArchiMer
Thebaud, Olivier; Veron, Gerard; Fifas, Spyros.
The commercial fishery for wedge clam, or telline (Donax trunculus) in the bay of Douarnenez in France started in the early 1980ies. During twenty years, the activity has developed, from an opportunistic fishery, into a regular fishing enterprise for 36 fishermen, who derive from it most, if not all, of their revenue. The fishery is nowadays strictly regulated. It is subject to natural variations in the productivity of clam stocks, in relation with meteorological conditions which can strongly affect the stocks. The bay of Douarnenez has been experiencing regular blooms of harmful algae, both of species leading to shellfish poisoning for human consumption, such as Dinophysis (Diarrhoeic Shellfish Poisoning) and Pseudo-nitzschia (Amnesic Shellfish...
Tipo: Text Palavras-chave: Temporary fishing ban; Mortality; Economic impact; Fishery; Wedge clam; Donax trunculus; Fermeture temporaire; Mortalité; Impact; Pêcherie; Telline; Donax trunculus.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-1262.pdf
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Les petites pêches côtières et estuariennes Françaises du sud du golfe de Gascogne. Typologie des flottilles et approche socio-économique et commerciale ArchiMer
Leaute, Jean-pierre; Caill-milly, Nathalie.
The European contract PECOSUDE (Small inshore fisheries of the south of Europe) accepted in 2000 for 2 years concerns French, Spanish and Portuguese partners. The aim is to assess the inshore and estuarine fisheries from Loire estuary to Portugal. Three levels of study are considered : fisheries (data 1999), socioeconomy and marketing (data 1999 or 2000). Exploitation in the 12 miles area for France and on continental shelf for northern Spain and Portugal (within 1000 m depth), as well as the fishing period lower than 96 hours was determined as the definition of this fishery for the study. Socioeconomic analyses are made only on boats smaller than 15 m. The fisheries part analyses the activity of the fishing vessels taking into account gears used, landed...
Tipo: Text Palavras-chave: Commercialisation; Indicateur économique; Pêcherie; Flottille de pêche côtière et estuarienne; Enquête socio économique; Typologie; Golfe de Gascogne; Marketing; Economic indicator; Fishery; Coastal and estuarine fishing fleet; Socioeconomic inquirie; Typology; Bay of Biscay.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/rapport-1572.pdf
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Les prises accessoires de la pêcherie de civelles (Anguilla anguilla) dans l'estuaire de la Loire en 1987 ArchiMer
Guerault, Daniel; Desaunay, Yves; Bellois, Pierre; Grellier, Patrick; Robin, Jean-paul; Robineau, Brigitte.
A survey of the glass-eel fishery in the Loire estuary in 1987 (265 boats, 117 tons gasseel, 13733 fishing trips) showed that 16 fishery species constitute the by-catch (49,3 million individuals, mainly juveniles, among which 98 % consist in flounder, sprat and brown shrimp). The analysis of catches in space and time leads to proposaIs for Iimiting the impact during the last fishing weeks. Taking into account the naturai mortality rates of the concerned juveniles, an attempt is made to estimate the actuai impact of the glasseel fishery, after a delay. Only 10 % of the caught brown shrimps wouid have been recruited in the summer shrimp fishery. Up to 85,5 to 97,6 % of juvenile fishes would have disappeared during the following year by natural mortality.
Tipo: Text Palavras-chave: Anguille; Pêcherie; Prises accessoires; Estuaire; Loire; Eel; Fishery; By catch; Estuary; Loire.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00120/23102/20951.pdf
Registros recuperados: 5
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