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Approche de la dynamique de stocks accessoires ArchiMer
Moguedet, Philippe.
For a few years now, the landings from the Lorient's industrial fleet have been continually increasing (32,000 tons in 1980, 56,000 tons in 1985). This fleet practices a multispecific exploitation of the international fishery of the west and north of Scotland. The rock salmon (Pollachius virens) is the fleets' target species, its catches of other gadidae are considered secondary. Two of the catches, those of the blue ling (Molva dypterygia) and the ling (Molva molva) have been advancing since the beginning of the decade and in 1985 represented 21% of the total amount in quantity and value landed by the industrial fleet. The objective of this study is to asses the status of these ling resources and examine whether their exploitation can, in the short term,...
Tipo: Text Palavras-chave: Stock dynamics; By catch; Ling; Molva spp; Industrial fleet; Lorient; Brittany; Gadidés; Biologie; Dynamique des stocks; Flottilles industrielles; Lorient; Bretagne; Molva spp; Lingue; Stock accessoire.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/these-2310.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie crevettière : expériences de chalut sélectif en baie de Vilaine, première partie ArchiMer
Dupouy, Herve; Vacherot, Jean-philippe; Meillat, Marc.
The French brown shrimp (Crangon crangon) fishery employs on a seasonal basis around 140 ships about 10 metres in length and with engines of about 100 kilowatts of power. It takes place mainly along the coastal bottoms of silted-up sand at a depth of 2 to 10 metres and occupies principally the coasts of the eastern English Channel and those of the Gulf of Gascony. The brown shrimp catch is performed by bottom trawl, with exempted meshing of 20 mm (stretched mesh), which causes numerous rejects of immature fish that live on the same bottoms. The main part of these juveniles is made up of flat fish (sole, in particular) and of gadidae (whiting and pout). To reduce these undesirable catches that are also detrimental to other fisheries, some ingenious...
Tipo: Text Palavras-chave: Selective trawl; Devisme trawl; Asselin trawl; Brittany; Bay of Vilaine; Gadides; Sole; Whiting; Pout; Juvenile; Chalut devisme; Chalut Asselin; Chalut sélectif; Baie de Vilaine; Gadidés; Soles; Merlan; Tacaud; Juvéniles.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/1997/rapport-2669.pdf
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Comment épargner les juvéniles de soles et de gadidés dans la pêcherie de crevette grise, Deuxième partie ArchiMer
Vacherot, Jean-philippe; Dupouy, Herve; Meillat, Marc.
Starting from the year 2000, the European Union planned to establish the use of a selective trawl in brown shrimp (Crangon crangon) fisheries. In fact, the brown shrimp is caught by a bottom trawl equipped with stretched 20 mm exempted meshing in estuary areas where the nurseries of flat fish and gadidae are located. For Vilaine's estuary, Dupouy et al (1997) estimated at about 1 tonne of flat fish and one tonne of gadidae the loss in equivalent fish of marketable size, per landed tonne of brown shrimp. In this document, the authors introduce improvements resulting from the use of selective trawls developed in France (Asselin and Devismes trawls), and they show by what means the selectivity of these trawls can be improved further.
Tipo: Text Palavras-chave: Bay of Vilaine; Common shrimp; Selective trawl; Whiting; Pout; Gadides; Soles; Juveniles; Baie de Vilaine; Crevette grise; Chalut sélectif; Merlan; Tacaud; Gadidés; Soles; Juvéniles.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/rapport-2670.pdf
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Influence des variations des facteurs environnementaux sur la croissance de poissons de l'Atlantique ArchiMer
Barrios, Alexander.
The impact of biotic factors such as density-dependent processes, recruitment, total mortality, and abiotic factors such as upwelling intensity, temperature and chlorophyll a concentration on the variation of growth parameters of pelagic and demersal fish were studied during the periods 1990 - 2008 (pelagic) and 1971 - 2015 (demersal). Life history parameters vary according to the species and from one region to another and over time within a given area because of their plasticity and the high fishing pressure. Interspecies and inter-regional comparison were carried out. Non-linear mixed effects models were used on different fish species of the Atlantic Ocean in order to estimate the growth parameters at the individual and population levels. Variations in...
Tipo: Text Palavras-chave: Croissance; Gadidés; Clupéidés; Atlantique; Otolithe; Modèle de von Bertalanffy; Modèles à effets mixtes.; Growth; Gadides; Clupeids; Atlantic; Otolith; Von Bertalanffy growth model; Mixed effects models..
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00419/53026/53960.pdf
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