Consulta: subjectFacets:"Exploitation rate"
Registros recuperados: 4
Data/hora: 12/06/2024 16:59:41

Daily and seasonal estimates of the recruitment and biomass of glass eels runs (Anguilla anguilla) and exploitation rates in the Adour open estuary (Southwestern France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bru, Noelle; Prouzet, Patrick; Lejeune, Michel.
The European eel (Anguilla anguilla) is drastically declining in all its distribution area and listed in the red list of the IUCN (International Union for Conservation of Nature). A rebuilding plan was adopted at European level in 2007, Regulation R(CE) 100/2007, to restore eel abundance to the level observed during the seventies. Its implementation started on the 1(st) of January 2009. This species is heavily threatened by numerous activities including fishing, and its management can only be effective through a systemic approach minimizing the whole range of human-induced impacts on the resource and its habitat. In the framework of the European interregional programme INTERREG IIIB-Atlantic Area-the INDICANG project aimed at elaborating abundance...
Tipo: Text
Palavras-chave: Biomass estimates; Exploitation rate; Time series; River; Glass eel; Anguilla anguilla.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11170/7526.pdf

A two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gras, Michael; Roel, Beatriz A.; Coppin, Franck; Foucher, Eric; Robin, Jean-paul.
The English Channel cuttlefish (Sepia officinalis) is the most abundant cephalopod resource in the Northeast Atlantic and one of the three most valuable resources for English Channel fishers. Depletion methods and age-structured models have been used to assess the stock, though they have shown limitations related to the model assumptions and data demand. A two-stage biomass model is, therefore, proposed here using, as input data, four abundance indices derived from survey and commercial trawl data collected by Ifremer and Cefas. The model suggests great interannual variability in abundance during the 17 years of the period considered and a decreasing trend in recent years. Model results suggest that recruitment strength is independent of spawning-stock...
Tipo: Text
Palavras-chave: Abundance indices; English Channel; Exploitation rate; Sepia officinalis; SST; Stock–recruitment relationship; Trawl survey; Two-stage biomass model.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00248/35923/34448.pdf

Analysis and visualization of the glass eel behavior (Anguilla anguilla) in the Adour estuary and estimate of its upstream migration speed
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Prouzet, Patrick; Odunlami, Marc; Duquesne, Elise; Boussouar, Ahmed.
The studies carried out on the Adour estuary on the migration of glass eels lead to the characterisation of their swimming behavior. Individuals migrate passively with the flood tide current behind the dynamic tide front, and their movements into the water column are linked to the surrounding luminosity and water turbidity. A numerical model was built from observations gathered on glass eel densities during scientific surveys. It uses the outputs of a hydrodynamic model accounting for the variations in the river flow and tide coefficient. It allows the simulation of the displacement of a particle in the longitudinal axis of the estuary. The variation of the vertical movements through the water column takes into account the cloud cover, the moon phases, the...
Tipo: Text
Palavras-chave: Numerical modeling; Fish behavior; Migration; Estuary; Hydrodynamics; Exploitation rate; Glass eel; Anguilla anguilla; Atlantic Ocean.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11171/7531.pdf

Etude technico-économique de la réalisation d'une unité de production d’alevins de tilapia du nil, "Oreochromis niloticus", dans les eaux géothermales du sud Tunisien
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Chahbani, J.; Dhraief, M.N.; Azaza, M.S.; Kraiem, M.M.
L’étude technico-économique de la réalisation d’une écloserie de Tilapia porte sur l’estimation du coût de production de l’alevin produit en fonction des charges variables et du compte d’exploitation pour trois situations différentes. Elle tient compte des paramètres biotechniques (densité, taux de survie, taux de conversion et composition de l’aliment) émanant d’expérimentations effectuées à la station piscicole de l’INSTM à Béchima (El-Hamma/Gabès). L’analyse a porté sur trois cas de production d’alevins de 2 g : 200000 en 4 cycles,  200000 en 6 cycles et 500000 en 4 cycles. Le coût de production d’un alevin  a été estimé respectivement à 0.034, 0.046 et 0.038 D.
Tipo: Journal Contribution
Palavras-chave: Tilapia culture; Production cost; Exploitation rate.
Ano: 2010
URL: http://hdl.handle.net/1834/4687