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| Registros recuperados: 135 | |
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| Poisson Caillault, Emilie; Vanhelst, Florentin; Charlet, Bastian; Mahe, Kelig. |
| Age and growth are primordial essential data in stock assessment and management. However, contracting experts for age estimation using calcified pieces costs several million euros annually. Yet, alternative methods exist for fish ageing using the otolith shape (i.e., otolith shape descriptors or Elliptic Fourier Analysis). The goal of this study is to use a new descriptor of the otolith shape with Mojette Transform as an input of k-Nearest Neighbors (k-NN), Random Forest (RF) and Multi-Layer Perceptron (MLP) classifiers. Mojette Transform is the exact discrete Radon transform used in tomographic reconstruction, image watermarking, or video compression. Its mathematical properties allow reducing the information and having enough redundancy to characterize... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00436/54723/56158.pdf |
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| Fave, Sébastien; Crepin, Emeline; Magalhaes, José Ramos; Ogor, Andre; De Pontual, Helene; Mahe, Kelig. |
| Chaque année, près d’1 million de pièces calcifiées (dont 35 000 en France) sont analysées pour l’évaluation de l’état des ressources marines. De plus, beaucoup de thématiques de recherche nécessitent elles-aussi l’utilisation de ces pièces calcifiées. Ainsi, depuis plus de 20 ans, un partenariat entre la société VSG (Visualization Sciences Group anciennement Noesis) et l’institut de recherche IFREMER (Institut Français de Recherche pour l'Exploitation de la Mer) a permis de développer le logiciel d'analyse d'images dédié aux pièces calcifiées, nommé TNPC (Traitement Numérique des Pièces Calcifiées, www.tnpc.fr). Divers projets de recherche et collaborations en particulier avec l’ENIB (Ecole Nationale des Ingénieurs de Brest) ont été nécessaires pour... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00148/25905/23922.pdf |
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| Mahe, Kelig; Elleboode, Romain; Loots, Christophe; Koubbi, Philippe. |
| Dusky rockcod, Trematomus newnesi, is a widely distributed neritic circumpolar Antarctic fish species. We conducted a study on age and growth of Trematomus newnesi in coastal waters of Adélie Land in East Antarctica. A total of 289 specimens were collected in 2003, 2005, 2006 and 2009. They consisted of 122 females, 132 males and 35 immature specimens. Total length (TL) and total weight (W) of these fish ranged from 13.5 to 25 cm and 19.7 to 174 g respectively for females and from 12 to 20.9 cm and from 24.1 to 144.1 g for males. The TL/W relationship was described by the following parameters: a=7.2.10-3 and b=3.127, showing no significant difference between sex (ANCOVA, P<0.05). Fish age was estimated by counting annual growth increments on polished... |
| Tipo: Text |
Palavras-chave: Antarctic fish; Trematomus newnesi; Otoliths; Growth; Age; Adelie land. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00333/44440/44156.pdf |
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| Bellamy, Elise; Roos, David; Mahe, Kelig. |
| Après la réalisation du projet de recherche DMX1 (Indicateurs biologiques et écologiques pour une gestion durable des stocks de poissons DéMersauX profonds d’intérêt halieutique à La Réunion), un second projet de recherche DMX2 va débuter en 2014. L'un des intérêts de ce projet est d'obtenir des premiers résultats de croissance des espèces profondes de l'île de la Réunion. Dans le cadre de la préparation de cette étude de croissance, des essais de faisabilité d’estimation de l’âge ont été réalisés sur des otolithes de vivaneau rubis (Etelis carbunculus) par le pôle national de sclérochronologie de l’Ifremer de Boulogne-sur-Mer. Les échantillons ont été prélevés par l’Ifremer de la Réunion en 2013 (David Roos). Ce rapport de faisabilité a permis de... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00180/29160/27568.pdf |
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| Mahe, Kelig; Coppin, Franck; Vaz, Sandrine; Carpentier, Andre. |
| Biological information is necessary for population structure assessment of economically important species. There are no known published studies on the age and reproduction of Mullus surmuletus in the north of the Bay of Biscay. The aim of this study was to estimate growth and reproductive biology of this species in the eastern English Channel and southern North Sea from 1089 individuals, observed from February to December 2004. The length–weight relationship was described by the parameters: a = 3.284.10−6 and b = 3.243, being allometrically positive. Ages were determined from increments of otoliths, used entirely after a burning treatment. Marginal-increment analysis showed an annual periodicity of increment formation. Von Bertalanffy growth equations were... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00148/25903/23960.pdf |
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| Durieux, Eric; Mahe, Kelig; Labonne, Maylis; Morin, Jocelyne; Brind'Amour, Anik. |
| Les zones côtières telles que les baies et les estuaires constituent des nourriceries pour les juvéniles de nombreuses espèces de poissons marins et en particulier les poissons plats. In fine, la fonction de nourricerie d’un habitat repose sur sa capacité à produire des individus qui vont contribuer à la population adulte. La composition élémentaire des otolithes de poissons est devenue un outil important pour étudier la connectivité entre les habitats des juvéniles et des adultes. Cette approche majeure en écologie halieutique repose sur l’identification de signatures multi-élémentaires caractérisant les nourriceries. Il est donc important de considérer les processus spatiaux à plus petite échelle de manière à identifier localement les habitats de... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00220/33153/31641.pdf |
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| Mahe, Kelig; Moerman, Martine; Maertens, Ilse; Holmes, Ian; Boiron-leroy, Anne; Elleboode, Romain. |
| There were an exchange and a workshop in 2002 of the sole in the Bay of Biscay. The Otolith Exchange Scheme 2011 was the second exercise for the sole in the Bay of Biscay. 5 readers participated in this exchange from Belgium (2 readers), from France (2 readers) and from UK England (1 reader). The otolith collection (n=120) came from 3 samples realized at the fishing port of La Cotinière during the month of June in 2010. For each otolith, readers had the images of otolith section before and after staining. This analyse presented the results of 8 readers (5 readings of stained otoliths and 3 readings of unstained otoliths). Mean precision of age estimate for individual fish were Coefficient of Variation (CV) of 4.7% and percent agreement to modal age of... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00063/17420/14943.pdf |
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| Bacha, Mahmoud; Moali, Aissa; Benmansour, Nasr-eddine; Brylinski, Jean-michel; Mahe, Kelig; Amara, Rachid. |
| Age, growth and diet of anchovy were studied for the first time from samples collected in the Bay of Benisaf (west Algerian coast) during summer (spawning period) and autumn (recruitment period) 2007. Age structure and growth parameters were determined by otolith (sagitta) analyses. The von Bertalanffy growth function fitted to age-length data showed that most of anchovy growth is achieved during the first year of life, suggesting that this stock is primarily supported by the smallest age groups and has a strong dependence on recruitment. There were no significant differences between males and females, and pooled mean parameters were: L infinity = 15.61 cm, k = 0.75 per year and to, -1.32 years. Whatever the age-class anchovy is strictly zooplanktivorous.... |
| Tipo: Text |
Palavras-chave: Engraulidae; Engraulis encrasicolus; MED; West Algeria; Anchovy; Growth; Age; Diet; Ontogenetic. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12212/9046.pdf |
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| Elleboode, Romain; Sorriaux, Marion; Penil, Caroline; Mahe, Kelig. |
| Ce rapport synthétise l'analyse des otolithes d'anguilles prélevés en 2015 dans le cadre du suivi des captures de cette espèce inscrite à la DCF. 306 anguilles ont été prélevées de mai à octobre 2015 dans l’Adour fluvial (n=104), la Dordogne (n=51), la Garonne (n=50), au lac de Grand Lieu (n=50) et dans la Loire fluviale (n=51). Lors du prélèvement, quelques règles sont à respecter pour optimiser l'utilisation des données: · prélever la paire de sagittae (paires d’otolithes les plus grands et non cassés), · noter de façon précise la date de prélèvement (JJ/MM/AA), · noter de façon précise le lieu de capture et fournir les cartes avec les lieux référencés à l'IFREMER, · identifier le sexe du poisson, · mesurer le poids total, la longueur totale et si... |
| Tipo: Text |
Palavras-chave: Anguille; Otolithe; Age; Adour fluvial; Dordogne; Garonne; Grand Lieu; Loire fluviale.. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00371/48183/48298.pdf |
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| Mahe, Kelig; Bellail, Robert; Dufour, Jean-louis; Boiron-leroy, Anne; Dimeet, Joel; Duhamel, Erwan; Elleboode, Romain; Felix, Jerome; Grellier, Patrick; Huet, Jerome; Labastie, Jacques; Le Roy, Didier; Lizaud, Oceann; Manten, Marie-line; Martin, Stephane; Metral, Luisa; Nedelec, Daniel; Verin, Yves; Badts, Vincent. |
| This document presents all the techniques used in routine by Ifremer to estimate the age of fish from the calcified piece. The procedure for estimating age describes each technical stage from the taking of the calcified piece through to the supplying of key sizes/ages to the European work groups. This procedure is specific to each species and even each population of fish. |
| Tipo: Text |
Palavras-chave: Poisson; TNPC; Préparation; Procédure; Age; Ecaille; Illicium; Otolithe; Sclérochronologie; Fish; TNPC; Preparation; Procedure; Age; Scale; Illicium; Otolith; Sclerochronology. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00000/7294/rapport-7294.pdf |
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| Mahe, Kelig; Villanueva, Ching-maria; Vaz, Sandrine; Coppin, Franck; Koubbi, Philippe; Carpentier, Andre. |
| Striped red mullet Mullus surmuletus L. 1758 is an economically important species in the Mediterranean Sea and in the northern Atlantic Ocean, where it is exploited from the Bay of Biscay to the southern North Sea (ICES, 2010). In Atlantic waters, there are two main areas where this species is caught, the Bay of Biscay and the eastern English Channel. This species was initially exploited by the Spanish fleets along the Spanish coast inside the Bay of Biscay. Originally considered as valuable by-catch (Marchal, 2008), the growing exploitation ofM. surmuletus and a conspicuous increase in landings in the English Channel and the southern North Sea by French, English and Dutch fleets have been observed from the 1990s onwards. This was attributed to an increase... |
| Tipo: Text |
Palavras-chave: Stock identification; Head morphology; Fish body shape; Truss model; Morphometric analysis. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00185/29587/28050.pdf |
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| Rochet, Marie-joelle; Prigent, M; Bertrand, Jacques; Carpentier, Andre; Coppin, Franck; Delpech, Jean-paul; Fontenelle, G; Foucher, Eric; Mahe, Kelig; Rostiaux, Emilie; Trenkel, Verena. |
| The results of a survey on fishers' perceptions of recent changes in the eastern English Channel ecosystem carried out in 2006 were compared with fishery and bottom-trawl survey data. A hypothesis-testing framework was used, testing the null hypothesis that fishers' statements were true, which permitted evaluation of both agreement and disagreement. Overall good agreement between fishers' statements and scientific data was found, and both sources suggested that the fish community in the Channel is undergoing large changes, among which are decreases in some commercially important species; in addition, a number of human pressures impact the ecosystem. Fishers had an accurate perception of changes and their time-frames, but not necessarily of their causes.... |
| Tipo: Text |
Palavras-chave: Stakeholder interview; Hypothesis testing; Fisher knowledge; Ecosystem approach to fisheries management; Eastern English Channel. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4474.pdf |
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| Mahe, Kelig; Elleboode, Romain; Bellamy, Elise. |
| Chez les poissons, l’âge est estimé à partir de l’analyse de pièces calcifiées (écaille, otolithe, vertèbre…). L'otolithe, situé dans l'oreille interne, est le plus utilisé en écologie car il est métaboliquement inerte et sa croissance est continue tout au long de la vie du poisson. Chaque poisson présente 3 paires d'otolithes (sagitta, lapillus et astericus) et leur forme sont différentes et spécifiques à chaque espèce. Le dénombrement des couches concentriques successives présentes sur les pièces calcifiées permettent d'estimer l'âge et la croissance somatique du poisson. Cependant, ces structures à la surface de l'otolithe peuvent présenter des échelles temporelles différentes. Chez les juvéniles, l'analyse des accroissements primaires traduit une... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00148/25904/23921.pdf |
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| Cresson, Pierre; Bouchoucha, Marc; Miralles, F.; Elleboode, Romain; Mahe, Kelig; Marusczak, Nicolas; Thebault, Herve; Cossa, Daniel. |
| Mercury (Hg) is one of the main chemicals currently altering Mediterranean ecosystems. Red mullet (Mullus barbatus and M. surmuletus) have been widely used as quantitative bio-indicators of chemical contamination. In this study, we reassess the ability of these species to be used as efficient bio-indicators of Hg contamination by monitoring during 18 months Hg concentrations in muscle tissue of mullet sampled from 5 French Mediterranean coastal areas. Mean concentrations ranged between 0.23 and 0.78 μg g−1 dry mass for both species. Values were consistent with expected contamination patterns of all sites except Corsica. Results confirmed that red mullets are efficient bio-indicators of Hg contamination. Nevertheless, the observed variability in Hg... |
| Tipo: Text |
Palavras-chave: Mercury; Bio-indicator; Fish; Mullus spp.; Mediterranean. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00244/35514/34083.pdf |
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| Healey, B.p; Mahe, Kelig; Cossitt, G.; Dufour, Jean-louis; Felix, Jerome; Hicks, H.f.; Hiscock, C.; Schwab, P.. |
| Atlantic cod (Gadus morhua) in NAFO subDivision 3Ps are exploited and jointly managed by Canada and France. Assessments of stock status incorporate age determinations from both countries when dis-aggregating total catches into catch-at-age. An otolith exchange was initiated to evaluate the degree of consistency in the age determinations of Canadian and French personnel. Both graphical and statistical analysis clearly indicate differences in interpretation between Canadian and French readers, with ages assigned by Canadian personnel generally being one-year greater than those of participants from France. However, consistency in age determinations was relatively high within Canada and within France. |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00035/14627/11905.pdf |
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| Bacha, Mahmoud; Amara, Rachid; Benmansour, N; Brylinski, Jean-michel; Moali, A; Mahe, Kelig. |
| Age, growth and feeding of anchovy were studied for the first time from samples collected in the Benisaf Bay (west Algerian coast) during summer (spawning period) and autumn (recruitment period) 2007. Age structure and growth parameters were determined by otolith (sagitta) analyses. The von Bertalanffy growth function fitted to age-length data showed that growth was almost achieved during the first year of life. Significant growth difference was recorded between males and females. Growth parameters were for females (L∞=17,46 cm, k=0,31 per year and t0= -3,46 years) and for male (L∞=16,67 cm, k= 0,35 per year and t0= -3,26 years). The parameters of the otoliths (surface, length, weight and width) were significantly correlated with age and fish length (LT)... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00012/12277/9068.pdf |
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| Registros recuperados: 135 | |
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