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Registros recuperados: 11
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Biological characteristics of European hake (Merluccius merluccius) sperm ArchiMer
Groison, Anne-laure; Suquet, Marc; Cosson, Jacky; Le Coz, Jean-rene; Jolivet, Aurelie; Garren, Francois.
Very little is known on European hake's reproductive biology and especially on biological characteristics of its sperm despite a growing interest in its aquaculture potential. This study reports, for the first time some hake sperm characteristics. After activation, the swimming phase lasts 3 min (8 min when activated with 50% sea water (SW) but lower initial velocity). The initial flagellar beat frequency (BF), velocity and percentage of motile cells decreased after 100 s. After 2 days at 4 degrees C, the mean Adenylate Energy Charge (AEC) level was 0.71. Sperm stored at 4 degrees C still showed motility after 9 days for 2 individuals. When cryopreserved, the motility recovery index of thawed spermatozoa ranged from 11.8% to 29.6%.
Tipo: Text Palavras-chave: AEC; Gamete quality; Sperm motility; Sperm Density; Merluccius merluccius.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6553.pdf
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Coupling spectral analysis and hidden Markov models for the segmentation of behavioural patterns ArchiMer
Heerah, Karine; Woillez, Mathieu; Fablet, Ronan; Garren, Francois; Martin, Stephane; De Pontual, Helene.
Background Movement pattern variations are reflective of behavioural switches, likely associated with different life history traits in response to the animals’ abiotic and biotic environment. Detecting these can provide rich information on the underlying processes driving animal movement patterns. However, extracting these signals from movement time series, requires tools that objectively extract, describe and quantify these behaviours. The inference of behavioural modes from movement patterns has been mainly addressed through hidden Markov models. Until now, the metrics implemented in these models did not allow to characterize cyclic patterns directly from the raw time series. To address these challenges, we developed an approach to i) extract new metrics...
Tipo: Text Palavras-chave: Fourier transform; Non negative matrix factorization; Classification; Animal behaviour; European sea bass; Movement ecology; Diurnal and tidal cycles; Biologging; Data storage tags.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00402/51400/51974.pdf
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Effects of T-bar and DST Tagging on Survival and Growth of European Hake ArchiMer
Jolivet, Aurelie; De Pontual, Helene; Garren, Francois; Begout, Marie-laure.
Controlled experiments were conducted to assess the effects of T-bar and DST tagging on post-release survival and growth of European hake. In this study, two groups of each 30 hake were considered: small fish (SF, average total length: 29.9 cm +/- 2.2 cm) and large fish (LF, average total length: 36.4 cm +/- 2.5 cm). Within each size group, fish were randomly assigned to one of 3 treatment groups: control (C), T-bar tagging referred as conventional tagging (CT) and DST tagging (DST) with dummy tags. After 4 months, the overall survival rate was 35%. Smaller fish were less impacted by the stress induced by handling, anaesthesia and tagging and in the SF group, the survival rates were similar (30%) for CT or DST. Specific growth rates were highly variable...
Tipo: Text Palavras-chave: Merluccius merluccius; Archival tag; Husbandry; Midterm experiment; Captive hake.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00065/17645/15196.pdf
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Essais d'un chalut avec fenêtre à mailles carrées en Mer du Nord ArchiMer
Brabant, Jean-claude; Delpech, Jean-paul; Dufour, Jean-louis; Garren, Francois.
The fragile state of the cod stock in the North Sea and Western Scotland has made the European Commission take a certain amount of measures to reconstitute these stocks since the end of 2001. One of those measures consisted of improving the selection capacity of the bottom otter trawls in order to reduce the capture of juveniles, through a compulsory selection device of square mesh panel type. In this context, the Regional Marine Fisheries Committee of Nord/Pas-de-Calais/Picardie, which is against any increase of the mesh size but agrees with the adoption of a new selection device, decided to organize technical trials along with the IFREMER, so as to evaluate its efficiency. A square mesh panel system was tested in multispecific fisheries in the southern...
Tipo: Text Palavras-chave: Essais à la mer; Pêcheries multispécifiques; Cabillaud; Mer du Nord; Sélectivité; Chalut; Mailles carrées.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-3463.pdf
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Fiches d'aide à l'identification. Poissons, céphalopodes et décapodes. Mer du Nord, Manche, Golfe de Gascogne et mer Celtique ArchiMer
Garren, Francois.
L’identification des espèces est à la base des travaux réalisés au cours des campagnes halieutiques. De sa fiabilité et de sa précision dépend la qualité des données. Les fiches présentées dans ce rapport ont donc pour objectif d'aider les équipes embarquées à reconnaître rapidement et facilement les espèces les plus fréquentes, capturées par un  chalut de fond ou pélagique dans les zones côtières ou hauturières,  et susceptibles de poser des problèmes d'identification. Chaque fiche regroupe des espèces de même ordre ou de même famille avec pour chacune d'entre elles, les principaux critères morphologiques caractéristiques les distinguant facilement des espèces voisines. Bien que plus de 250 espèces y soient représentées, il ne s'agit donc pas d'un...
Tipo: Text
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00353/46431/73143.pdf
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Fiches d’aide à l’identification. Poissons et céphalopodes de Manche et de mer du Nord ArchiMer
Garren, Francois; Verin, Yves; Dufour, Jean-louis; Mahe, Kelig; Le Roy, Didier; Rostiaux, Emilie.
This document present identification fact sheets of fishes and cephalopods species frequently captured during scientific surveys in the English Channel and the North Sea. Simple and concise description of the morphological criteria enable a fast and easy discrimination between species that may be confused.
Tipo: Text Palavras-chave: Identification; Poisson; Céphalopode; Manche; Mer du Nord; Identification; Fish; Cephalopod; English Channel; North Sea..
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00326/43758/43302.pdf
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Guide salle tri Thalassa 2019. Campagnes halieutiques ArchiMer
Garren, Francois; Lazard, Coline; Le Roy, Didier.
Ce document présente, pour les novices mais aussi pour les « habitués », le fonctionnement global de la salle de tri de la Thalassa, lors des campagnes halieutiques. Il permettra de se familiariser avec cet outil avant l’embarquement, sachant que la formation sera progressivement affinée et complétée à bord. Suite à la modernisation de la Thalassa en 2017, la salle de tri a en effet subi un nombre conséquent de modifications et notamment l’informatisation des postes de travail. Même si le travail de base demeure le même, il convient de prendre et de respecter quelques précautions d’usage, afin de limiter les erreurs et de fournir des données de qualité. Ce document tentera de fournir les premières bases (ou vous permettre de vous remémorer certains points)...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00597/70945/73120.pdf
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LANGOLF-TV 2019 ArchiMer
Vacherot, Jean-philippe; Butler, Rosemarie; Coupeau, Yann; Garren, Francois; Rivoalen, Jean-jacques; Simon, Julien; Marc, Emilie; Fifas, Spyros.
La campagne annuelle Langolf-TV a pour but l’estimation de l’abondance de langoustine (Nephrops norvegicus) du Golfe de Gascogne (FU23-24) par comptage de leurs terriers, en utilisant une caméra vidéo sous-marine. Elle est pilotée par le CNPMEM, mise en oeuvre par l’IFREMER, et financée par la mesure 38 du FEAMP et FFP.  
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00634/74652/74549.pdf
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New insights into behavioural ecology of European seabass off the West Coast of France: implications at local and population scales ArchiMer
De Pontual, Helene; Lalire, Maxime; Fablet, Ronan; Laspougeas, Claire; Garren, Francois; Martin, Stephane; Drogou, Mickael; Woillez, Mathieu.
From 2010 to 2012, 246 data storage tags were deployed on European seabass in the Iroise Natural Marine Park, a marine protected area (MPA) off west Brittany, France. A return rate of 14.6% associated with long time series of data provided new information on fish ecology (e.g. maximum experienced depth greater than 225 m, temperature range 6.80–21.87°C). Depth and temperature series were used to infer individual migration using an innovative hidden Markov model (HMM) especially developed for seabass geolocation. Reconstructed fish tracks revealed that seabass is a partially migratory species, as individuals exhibited either long-distance migrations towards the Bay of Biscay or the Celtic Sea, or residency behaviour in the Iroise Sea. Fidelity to summer...
Tipo: Text Palavras-chave: Cod; Connectivity; Data Storage Tag (DST); Depth; European sea bass; Dicentrarchus labrax; Geolocation; Partial migration; Spawning site fidelity; Temperature; Vertical movement.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00451/56230/57790.pdf
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Nourdem Loire : bilan de la campagne 2017 ArchiMer
Le Goff, Ronan; Drogou, Mickael; Le Ru, Loic; Garren, Francois; Martin, Stephane; Le Roy, Didier; Bouche, Ludovic; Berthele, Olivier.
Rapport de la campagne d'échantillonnage réalisée au moyen du chalut GOV "Bargip" entre le 29 juin et le 6 juillet 2017 dans l'estuaire de la Loire afin d'y produire l'indice d'abondance 2017 en juvéniles de bar (et autres espèces piscicoles).
Tipo: Text Palavras-chave: Bar européen; Nourricerie de l’estuaire de la Loire; Échantillonnage au chalut; Indice d’abondance 2017; Dicentrarchus labrax; European Sea Bass; Nurserie of the Loire estuary; 2017 Abundance index; Dicentrarchux labrax; Trawling net samplings.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00414/52544/53458.pdf
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NOURDEM Seine : bilan de la campagne 2017 ArchiMer
Le Goff, Ronan; Drogou, Mickael; Le Ru, Loic; Garren, Francois; Martin, Stephane; Bouche, Ludovic; Le Roy, Didier; Berthele, Olivier.
Rapport de la campagne d’échantillonnage réalisée au moyen du chalut GOV « Bargip-NOURDEM » en août 2017 dans l’estuaire de la Seine afin d’y produire l’indice d’abondance 2017 en juvéniles de bar (et de quelques autres espèces d’intérêt commercial). Définition du plan d’échantillonnage applicable à l’avenir en cas de pérennisation d’une campagne annuelle. Campagne réalisée dans le cadre d'un partenariat entre l'Ifremer, le Comité Régional des Pêches Maritimes de Normandie, le Comité Régional des Pêches Maritimes et Elevages Marins des Hauts de France, et les organisations de producteurs OP CME, OP Normandie, OP COBRENORD, OP FROM NORD et OP Pêcheurs de Bretagne.
Tipo: Text Palavras-chave: Bar européen; Dicentrarchus labrax Nourricerie de l’estuaire de Seine échantillonnage au chalut Indice d’abondance 2017. European Sea Bass Dicentrarchux labrax Nurserie of the Seine estuary 2017 Abundance index trawling net samplings.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00411/52262/53008.pdf
Registros recuperados: 11
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