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| Marandel, Florianne; Biais, Gerard; Bidault, Adeline; Charrier, Grégory; Cornette, Florence; Lapegue, Sylvie; Laroche, Jean; Le Cam, Sabrina; Stephan, Eric; Trenkel, Verena; Lorance, Pascal. |
| At the ecosystem level, sustainable exploitation of fisheries resources depends not only on the status of target species but also on that of bycatch species, some of which are even more sensitive to exploitation. This is the case for a number of elasmobranchs (skates, rays and sharks) species whose abundance declined during the 20th century. Further, the biology of elamobranchs is still poorly known and traditional fisheries stock assessment methods using fisheries catches and scientific survey data for estimating abundance are expensive or even inapplicable due to the small numbers observed. The GenoPopTaille project attempts to apply to the case of the thornback ray (Raja clavata) recent genetic-based methods for absolute population abundance estimation... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00343/45439/44960.pdf |
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| Leblanc, Nicolas; Tetard, Alain; Legrand, Véronique; Stephan, Eric; Hegron Macé, Laurence. |
| The landing ban of Raja undulata has raised misunderstanding for French fishermen, particularly for those fishing in the Norman‐Breton gulf (Southeast of ICES Division VIIe) where this species is very abundant. In this context, the RAIMOUEST project was launched as a professional and scientist partnership in order to enhance fisheries data on the main ray species caught in the Norman-Breton Gulf (Raja undulata, Raja brachyura, Raja clavata, Raja montagui and Raja microocellata). The French ray fisheries fleet was identified and a sample of fishermen involved in rays fishing was interviewed. Landings and effort data (logbooks), auctions sales and sampling at sea aboard professional fishing vessels were analysed. This working document presents the current... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00342/45329/44791.pdf |
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| Biais, Gerard; Hennache, Cedric; Stephan, Eric; Delamare, Aline. |
| An undulate ray (Raja undulata) tagging survey was carried out from the end of 2011 to mid-2014 in the Bay of Biscay with the partnership of the fishing industry. It demonstrates that the undulate ray can be found all along the French coast from the Loire estuary to the Spanish boarder, forming several isolated units, the more important being likely in the central part of the Bay of Biscay (Pertuis Charentais – Gironde area). Even in this latter limited area, the population is structured in sub-units with a low exchange rate between them. This population structure allowed to estimate abundance by mark-recapture in the Gironde estuary, using a Petersen estimate. The conditions that must be respected for such closed population abundance estimate are... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00241/35251/33768.pdf |
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| Leblanc, Nicolas; Tetard, Alain; Legrand, Véronique; Stephan, Eric; Hegron-mace, Laurence. |
| The landing ban of Raja undulata has raised misunderstanding for French fishermen, particularly for those fishing in the normano‐breton gulf (Southeast of ICES Division VIIe) where this species is very abundant. In this context, the RAIMOUEST project was launched as a professional and scientist partnership in order to enhance fisheries data on the main ray species caught in the Normand-Breton Gulf (Raja undulata, Raja brachyura, Raja clavata, Raja montagui and Raja microocellata). The French ray fisheries fleet was identified and a sample of fishermen involved in rays fishing was interviewed. Landings and effort data (logbooks), auctions sales and sampling at sea aboard professional fishing vessels were analysed. This working document presents the current... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00224/33522/31937.pdf |
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