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| Registros recuperados: 135 | |
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| Hussy, Karin; Morales-nin, Beatriz; Pineiro Alvarez, Carmen; De Pontual, Helene; Smith, Joanne; Mahe, Kelig; Krumme, Uwe; Songer, Sally; Walther, Yvonne; Rey, Javier. |
| This chapter was written during the Workshop on Age Validation of Gadoids (WKAVGS 2013) which was held 6–10 May 2013 at Imedea in Esporles, Mallorca. The terms of reference for the workshop were to: 1. Review information on age estimations, otolith exchanges, workshops, and validation works done so far on the following species: European hake, cod, pollock, saithe, haddock, whiting, and blue whiting; 2. Assemble and compare the results of different validation methods (i.e. marking and recapture, marking the calcified structure, marginal increment analysis, marginal analysis, modal progression analysis, length back-calculation, etc.); 3. Discuss and propose the most appropriate validation methods of age and growth pattern of calcified structures (CS), for... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00620/73189/72379.pdf |
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| Mahe, Kelig; Ider, Djamila; Massaro, Andrea; Hamed, Oussama; Jurado-ruzafa, Alba; Goncalves, Patricia; Anastasopoulou, Aiketerini; Jadaud, Angelique; Mytilineou, Chryssi; Elleboode, Romain; Ramdane, Zohir; Bacha, Mahmoud; Amara, Rachid; De Pontual, Helene; Ernande, Bruno. |
| Otolith shape analysis is an efficient fish stock identification tool. However, most applications used left and right otoliths or only one of them arbitrarily chosen without testing for biases resulting from potential directional bilateral asymmetry (DA) in otolith shape, i.e. a unimodal population-level deviation form bilateral symmetry between right and left otolith shapes. In this study, 560 bogues (Boops boops) were sampled from 11 geographical locations from the Canary Islands to the Aegean Sea and elliptical Fourier descriptors were used to describe their otoliths’ shape. First, a significant otolith DA was observed at the global scale with an average amplitude of 2.77%. However, at the scale of sampling locations, DA was not always significant and... |
| Tipo: Text |
Palavras-chave: Boops boops; Elliptical Fourier analysis; Mediterranean Sea; Side effect; Stock identification. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00468/57967/60418.pdf |
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| Delerue-ricard, Sophie; Hanna, Stynen; Barbut, Léo; Morat, Fabien; Mahe, Kelig; Hablützel, Pascal I.; Hostens, Kris; Volckaert, Filip. |
| While otolith shape analysis can provide a valuable tool for discriminating between fish populations, factors which may influence otolith shape, such as the effect of size, directional asymmetry in growth, and local environmental conditions, are often unknown. Here, we analyzed differences in otolith shape across three size classes of age-0 common sole Solea solea L. from nursery grounds off the Belgian coast and in the Wadden Sea. Across size classes, form-factor decreased and roundness remained consistently high in both nursery grounds, while ellipticity increased in the Belgian nursery. Directional asymmetry between left and right otoliths measured by Fourier coefficients accounted for 0.96 and 7.2% of the variance when comparing otoliths overall, and... |
| Tipo: Text |
Palavras-chave: Early-life stages; Fourier coefficients; Nursery ground; Otolith shape; Small-scale spatial structure. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00453/56476/58866.pdf |
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| Caill-milly, Nathalie; Bru, Noelle; Mahe, Kelig; Borie, Catherine; D'Amico, Franck. |
| While gradual allometric changes of shells are intrinsically driven by genotype, morphometrical shifts can also be modulated by local environmental conditions. Consequently the common use of a unique dimension (usually length) to assess bivalves’ growth may mask phenotypic differences in valve shape among populations. A morphometric exhaustive study was conducted on Manila clam, Ruditapes philippinarum, by acquiring data in the French Arcachon Bay (intrasite phenotypic variability) and by comparing with other sites in the literature (intersite phenotypic variability). 2070 shells were subsampled, weighted, and automatically measured using TNPC software. Some ratios’ values indicate a relatively round and globular shape shell in comparison with other sites... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00116/22684/20420.pdf |
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| Mahe, Kelig; Bellamy, Elise; Delpech, Jean-paul; Lazard, Coline; Salaun, Michele; Verin, Yves; Coppin, Franck; Travers-trolet, Morgane. |
| Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR... |
| Tipo: Text |
Palavras-chave: Weight-length relationship; Condition factor; Bay of Biscay; Celtic Sea; English Channel; North Sea; Sexual dimorphism; Seasonality. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00363/47418/47513.pdf |
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| Vigneau, Joel; Claireaux, Daniel; Goascoz, Nicolas; Goraguer, Herle; Mahe, Kelig. |
| The Atlantic halibut stock area comprises the NAFO subdivisions 3NOPs4VWX5Zc where total international catches has increased to about 2300 tonnes in 2013 and the TAC for 2014 has been set to 2563 tonnes. The St-Pierre et Miquelon uptake of the overall quota varies between 2 to 6 % over the last 10 years. In 2014, responding to a demand for improving the scientific cooperation, by the Canada France Consultative Committee (CFCC) for 3Ps management, SPM began the monitoring of the autumn fishery by on-board observer. The objectives were to provide the stock assessment working group with information on maturity given that the fishery is fishing on a spawning ground. |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00270/38074/36194.pdf |
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| Ramdane, Zouhir; Trilles, Jean-paul; Mahe, Kelig; Amara, Rachid. |
| A total of 664 Boops Boops (Linnaeus, 1758) and 823 Mullus barbatus barbatus Linnaeus, 1758 from the east coast of Algeria were examined to study their parasitofauna. We collected eleven parasitic species (two monogeneans, three copepods, five isopods and one Branchiura) from B. boops, and four parasitic species (two copepods and two isopods) from M. barbatus barbatus. Five species were reported for the first time in Algeria. The site of attachment on the host and the degree of specificity varied according to the parasite species while the infestation rate changed according to the month and the host size. The parasitism did not show a significant negative impact on the biological parameters of the fish host. |
| Tipo: Text |
Palavras-chave: Boops boops; Mullus barbatus barbatus; Algeria; Ectoparasites; Impact of parasitism. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00148/25901/23918.pdf |
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| Cresson, Pierre; Fabri, Marie-claire; Miralles, Francoise Marco; Dufour, Jean-louis; Elleboode, Romain; Sevin, Karine; Mahe, Kelig; Bouchoucha, Marc. |
| Despite being generally located far from contamination sources, deep marine ecosystems are impacted by chemicals like PCB. The PCB contamination in five fish and shark species collected in the continental slope of the Gulf of Lions (NW Mediterranean Sea) was measured, with a special focus on intra- and interspecific variability and on the driving factors. Significant differences occurred between species. Higher values were measured in Scyliorhinus canicula, Galeus melastomus and Helicolenus dactylopterus and lower values in Phycis blennoides and Lepidorhombus boscii. These differences might be explained by specific abilities to accumulate and eliminate contaminant, mostly through cytochrome P450 pathway. Interindividual variation was also high and no... |
| Tipo: Text |
Palavras-chave: Bioaccumulation; Continental slope; Gulf of Lions; PCB. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00313/42421/41790.pdf |
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| Mahe, Kelig. |
| The Planning Group on Commercial Catch, Discards and Biological Sampling (PGCCDBS) meeting in March 2005 (ICES, 2005), identified saithe as one of the species requiring confirmation of ages being assigned by Fisheries Institutes. The planning group indicated that the IFREMER, France should be responsible to organising a saithe otolith exchange (ICES, 2005). According to the PGCCDBS meeting 2006, the saithe otolith exchange in 2005 has been postponed to 2006. Ifremer (France) would be responsible for the organisation and analysis of the otoliths exchange for ICES areas IV and VI (ICES, 2006). 10 countries took part in this exchange : Denmark, Faroe Islands, France, Germany, Iceland, Norway, Sweden, UK England, UK Northern Ireland & UK Scotland. The... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00225/33631/32029.pdf |
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| Dufour, Jean-louis; Chantre, Celina; Elleboode, Romain; Mahe, Kelig. |
| Le merlan (merlangius merlangus) est une espèce commerciale importante suivie au niveau européen. La pièce calcifiée utilisée pour l’estimation de l’âge du merlan est l'otolithe. Parmi les 3 paires d'otolithes, ce sont toujours les plus gros, les sagittae qui sont utilisés. Ils conservent la séquence complète des marques de croissance enregistrées (Panfili et al., 2002). Pour observer au mieux ces structures, la technique de coupe transversale a été retenue comme la plus précise (ICES WKARWHG2 REPORT 2016). Les images obtenues sont soumises à l’interprétation par les experts européens. Ce rapport propose de décrire précisément les structures observables sur les images obtenues par la technique de coupe transversale. La variabilité des structures est... |
| Tipo: Text |
Palavras-chave: Merlan; Otolithe; Age; Radiale; Analyse d’images; Croissance. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00627/73941/73376.pdf |
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| Chater, Ines; Romdhani, Ahlem; Ktari, Mohamed Hédi; Mahe, Kelig. |
| Analysis of diet composition and feeding intensity of the brown meager (Sciaena umbra, Linnaeus, 1758) was realised seasonally and according to the fish size in the Central Mediterranean sea (Gulf of Tunis). Specimens were collected, monthly from October 2008 to September 2011 from the landings of the small-scale fisheries. In all, 272 stomachs of brown meagre measuring between 15.3 and 49.2cm total length (TL) were examined. The prey items identified in stomachs belong to six groups: Crustacea (Decapoda, Amphipoda, Isopoda, Mysidacea, Stomatopoda…), Annelida, Mollusca, Teleostei, Angiosperma and Algae. 118 stomachs were empty (43.4%). This percentage varied throughout the year. The lowest feeding intensity was recorded in summer during spawning period... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00117/22791/20593.pdf |
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| Elleboode, Romain; Oudard, Clemence; Mahe, Kelig. |
| TNPC (Traitement Numérique de Pièces Calcifiées) est un logiciel dédié à l’acquisition et au traitement des pièces calcifiées, développé l'institut français IFREMER. Plusieurs années ont été nécessaires à l’élaboration de ce logiciel. Le développement du projet a commencé en 1994 avec le travail d’Hervé Troadec, en collaboration avec d’autres personnes tels que Ronan Fablet, Hélène de Pontual et André Ogor. TNPC (version 7) fonctionne sur la plate-forme Visilog (version 7) développée par la société FEI (anciennement Noésis). La plupart des applications utilisées sont des fonctions propres de Visilog et vous trouverez toutes les informations appropriées dans la documentation installée avec TNPC. TNPC a connu de nombreuses évolutions ces dernière années,... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00276/38692/37193.pdf |
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| Mahe, Kelig; Rabhi, Khalef; Bellamy, Elise; Elleboode, Romain; Aumond, Yoann; Huet, Jerome; Roos, David. |
| The brilliant pomfret (Eumegistus illustris) occurs in the western part of the Indian Ocean and the western and central Pacific Ocean. To date, the biology of E. illustris has never been documented. The aim of the present study was to investigate age and growth of E. illustris along the coasts of Reunion Island, based on calcified structures analysis. One hundred thirty five individuals were sampled in the landings of the French local artisanal fisheries from March 2014 to March 2015. The relationships between two types of body length (Total and Standard lengths, cm) and Total weight (g) were significant (P<0.05). Total length-weight relationship was described by the following parameters: a=0.012 and b=3.015 without significant effect of sexual... |
| Tipo: Text |
Palavras-chave: Eumegistus illustris; Growth; Scale; Otolith; Opercular bone; Indian Ocean; Reunion island. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00307/41861/41113.pdf |
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| Mahe, Kelig; Dufour, Jean-louis; Mccausland, Ian; Sainza, Maria; Leal, Ana; Gonzalez, Cristina; Elleboode, Romain. |
| In September 2015, the Working Group on Biological Parameters (WGBIOP) recommended the first otolith exchange for Pollachius pollachius in 2016 (Otolith Exchanges proposals for 2016/2017; ICES, 2015). Kélig Mahe (IFREMER, France) was decided to be the responsible to organise this otolith exchange. A total of 5 readers from 2 countries (France & Spain) participated at the exchange of 2016. The otoliths of 314 individuals sampled from 2011 to 2015 in Southern stock (ICES area: IXa; n=99) and in (ICES areas: IVc, VIId, VIIe, VIIj-h; n=215) were used for this exchange. For the Northern stock, the precision values for both stocks were very high but the value for Northern stock (PA=91.6%, CV=3.8%; APE= 0.8%) was higher than this for Southern stock (PA=74.5%,... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00351/46200/45899.pdf |
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| Registros recuperados: 135 | |
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