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| 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 |
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| 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 |
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| 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 |
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