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Registros recuperados: 22
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Characteristics of one sea winter Atlantic salmon stock caught on Elorn river from 1974 to 1984 ArchiMer
Prouzet, Patrick; Gaignon, Jean-louis.
From observations gathered on grilse populations sampled during the fishing period (March -mid-June) or after the fishing season, the authors noted: a strong heterogeneity and length, the mean value of which increase from May to December, a sex-ratio not different from 1 male for 1 female, a high relative fecundity superior to those of spring salmon population sampled. The comparison between fish of local and foreign origins did not allow to observe significant differences between the biological characteristics studied (weight, length, sex-ratio and fecundity).
Tipo: Text Palavras-chave: Salmo salar; Salmonidae; Pisces; Weight; Fecundity; Sex ratio; Length weight relationships; Migratory species.
Ano: 1983 URL: http://archimer.ifremer.fr/doc/1983/publication-1818.pdf
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Cod (Gadus morhua) rearing attempts in France ArchiMer
Suquet, Marc; Omnes, Marie-helene; Normant, Yvon; Petton, Bruno; Severe, Armelle; Fauvel, Christian; Barone, Herve; Quemener, Loic; Buchet, Vincent; Pasco, Laurent; Menard, E; Gaignon, Jean-louis.
Because of its rapid growth, its good reputation and the promising aquaculture experiences conducted in Norway and Scotland, cod is considered as a good candidate for cold water aquaculture. The aim of this paper is to present the work carried out in France since 1999: the selection of cod as a promising candidate for aquaculture and the assessment of its rearing performances in this environment.
Tipo: Text
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00170/28142/26362.pdf
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Données économiques maritimes françaises 2005 ArchiMer
Kalaydjian, Regis; Daures, Fabienne; Gaignon, Jean-louis; Girard, Sophie; Guyader, Olivier; Matte, Isabelle; Mongruel, Remi; Perez, Jose; Thebaud, Olivier.
The report presents a survey of marine related activities in France, highlighting recent past trends, present situation and future outlook. The commercial sector includes marine resource exploitation, manufacturing branches and services. The public sector includes the Navy, State services, environmental protection and research. A summary identifies the main factors in the development of marine activities.
Tipo: Text Palavras-chave: Outlook; Employment; Value added; Marine; Economy; Perspectives; Emploi; Valeur ajoutée; Maritime; Économie.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-3919.pdf
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Effect of water temperature on individual reproductive activity of pollack (Pollachius pollachius) ArchiMer
Suquet, Marc; Normant, Yvon; Gaignon, Jean-louis; Quemener, Loic; Fauvel, Christian.
The effects of water temperature on pollack (Pollachius pollachius) spawning features were individually assessed. During the spawning period, nine fish sets, each composed of one female and two males (mean body weight: 2.5+/-1.0 kg), were placed in small-volume tanks (2 m(3)). Fish sets were held at 8, 10, or 12 degreesC (n=3 for each temperature). Three females released eggs at 8 and 10 degreesC, while only two spawned at 12 degreesC. One hundred thirty-one individual spawns were collected from the eight spawning fish sets. The number of spawns collected per female was significantly lower at 12 degreesC (3.0+/-3.6), compared to 10 degreesC (17.3+/-10.1) and 8 degreesC (23.3+/-2.5). Egg number (eggs kg(-1) BW) was significantly lowered at 12 degreesC...
Tipo: Text Palavras-chave: Egg quality; Temperature; Reproduction; Pollachius pollachius; Pollack; Gadoids.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-470.pdf
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Etude de la production de juvéniles de saumon atlantique (Salmo salar) - 1 - Résultats de la saison 1979-1980 Pisciculture du Quinquis ArchiMer
Gaignon, Jean-louis; Prouzet, Patrick.
La pisciculture du Quinquis, sise près de Landivisiau (29), a pour objet la production intensive de smolts de saumon atlantique (Salmo salar) dans le cadre d'un programme d'aménagement et de repeuplement de la rivière Elorn. Depuis sa mise en eau (1976) les résultats ont été décevants et ceci à cause, d'une part de difficultés de démarrage (problèmes alimentaires en autres), d'autre part de problèmes sanitaires : la furonculose ayant entrainé des mortalités importantes dès le 1er automne (alevins à bonne croissance) ou en fin d'hiver. Au total, la survie a toujours été très faible et la production de smolts négligeable. C'est pourquoi, à partir de la saison 79-80, les objectifs ont été tournés davantage vers l'expérimentation tout en conservant un objectif...
Tipo: Text Palavras-chave: Saumon atlantique; Salmo salar; Elevage; Juvénile; Paramètres élevage; Données économiques; Pisciculture.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00083/19420/17031.pdf
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Etude de la production de juvéniles de saumon atlantique (Salmo salar). II - Influence de la densité sur l'alevinage. Campagne 1980-1981 Pisciculture du Quinquis ArchiMer
Gaignon, Jean-louis; Prouzet, Patrick.
Les résultats de la campagne 1979-1980 ont montré la nécessité d'améliorer les performances de l'alevinage pour obtenir des résultats de production intéressants en cycle ouvert dans les conditions bretonnes. En effet, une augmentation du taux de smoltification à un an ne semble pouvoir être obtenue dans des conditions économiquement intéressantes (Charge très supérieure à 2 kg/m2), qu'à condition que la taille des tacons soit au moins égale à 6-7 cm en septembre de la première année. En conséquence, l'objectif expérimental de la saison 1980-1981 est de déterminer les conditions d'élevage qui puissent permettre d'obtenir un population homogène ayant une bonne croissance c'est-à-dire très supérieure à celle obtenue en 79-80....
Tipo: Text Palavras-chave: Aquaculture; Pisciculture; Production; Juvéniles; Salmo salar; Densité.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00143/25381/23519.pdf
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Etude de la qualité microbiologique et chimique de la zone : Côte Sauvage ArchiMer
Lecadet, Cyrielle; Piquet, Jean-come; Noyer, Mathilde; Morin, Dimitri; Fillon, Alain; Gaignon, Jean-louis.
Suite à la demande d' exploitation de la zone «Côte Sauvage » par les professionnels, la Direction Départementale des Territoires et de la Mer (DDTM) a demandé la réalisation d'une étude de zone en vue de son classement. Cette étude réalisée par le Laboratoire Environnement Ressources des Pertuis Charentais, avec le concours des professionnels bénéficie d'un financement DPMA-DGAL. Basée sur les paramètres microbiologique (Escherichia coli) et chimiques (Pb, Hg, Cd), l'étude a pour objectifs : - d'estimer la qualité microbiologique et chimique de la zone en vue de son classement sanitaire par l'Administration conformément aux exigences du Règlement CE n° 854/20041 ; - de déterminer la stratégie d'échantillonnage à mettre en oeuvre dans le cadre de la...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00430/54158/55490.pdf
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Experimental ecology: A key to understanding fish biology in the wild ArchiMer
Suquet, Marc; Rochet, Marie-joelle; Gaignon, Jean-louis.
Because of natural complexity, field studies are often inconclusive with regards to the ultimate cause of a given change observed in wild animal populations. As a consequence, there is scope to develop an Experimental Ecology Approach (EEA). In this paper, we favour the use of experimental ecology studies to evaluate the effects of environmental factors on fish biology. We identify the advantages of EEA: disentangling the effects of several factors and identifying their respective roles, generating artificial scenarios and increasing our capability to collect and analyse data. This study emphasises the constraints of this approach: fish biological performances may be altered by rearing conditions, by domestication and by the prevention of some behaviours....
Tipo: Text Palavras-chave: Cod; Field study; Environmental parameters; Laboratory experiments; Experimental ecology.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-714.pdf
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First rearing attempts of pollack, Pollachius pollachius ArchiMer
Suquet, Marc; Petton, Bruno; Normant, Yvon; Dosdat, Antoine; Gaignon, Jean-louis.
Tipo: Text
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00188/29888/28339.pdf
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Growth and reproductive performances of juveniles and sexually mature pollack Pollachius pollachius in different conditions ArchiMer
Omnes, Marie-helene; Severe, Armelle; Barone, Herve; Suquet, Marc; Buchet, Vincent; Le Roux, Annick; Gaignon, Jean-louis; Fostier, Alexis; Fauvel, Christian.
The pollack Pollachius pollachius is a commercially important fish, considered as a candidate for aquaculture in France. Rearing attempts are promising (Suquet et al., 1996), and more information is required about its reproduction, to contribute to a better management of breeders for this species. This study was designed to examine the first maturity in pollack and the effects of conditions such as origin and delayed reproduction season, on gonad maturation, reproductive and growth performances of adults.
Tipo: Text
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00002/11324/7861.pdf
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Influence de l'hydrodynamique des bassins sur la survie et la croissance des larves de turbot (Psetta maxima) ArchiMer
Gaignon, Jean-louis; Petton, Bruno; Quemener, Loic.
During larval rearing phase of turbot, a substantial variability in survival and growth is frequently observed. In this paper, we studied the effects of hydrodynamics in larvae rearing tanks on the survival and the growth of fed and starved larvae, using the following conditions: water flows of 600 and 1200 ml.mn(-1), constant and progressive ones, air flows of 10 and 30 ml.mn(-1), downward and upward water circulation, with direction change during the rearing phase. We also studied the interactions between water circulation direction and feeding conditions by (1) shifting the first feeding day (4 occasions, at 8 hours intervals, from 52 to 76 hours after 95% of hatching) and (2) using 2 amounts of preys (which differ by a factor 3). The results show that...
Tipo: Text Palavras-chave: Turbot; Techniques d'élevage; Alimentation; Turbot; Rearing methods; Feeding.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/00447/55837/62120.pdf
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Influence of early thermic and photoperiodic control on growth and smoltification in Atlantic salmon (Salmo salar) ArchiMer
Gaignon, Jean-louis; Quemener, Loic.
Atlantic salmon juveniles were subjected to a precocious (day 104 after first feeding) photoperiodic (P) and thermic (T) control. After rearing the fry at 16 degrees C, constant (16 hours of light and 8 hours of darkness, 16 degrees C) (C) and shortened simulated natural S photoperiod and temperature regimes were used in a factorial experimental design until transfer to seawater. The growth obtained with constant (C) regimes was better than with S regimes. In all cases, we observed very early (day 141, mid-June) a clear segregation of the population into two different subpopulations. Among the conditions, all the differences between the upper and lower modes were growth-dependent. We observed different developmental trends of the gill (Na+-K+)-ATPase...
Tipo: Text Palavras-chave: Photopériode; Température; Smolts 0+; Saumon atlantique; Photoperiod; Temperature; 0(+) smolts; Atlantic salmon.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00190/30159/28746.pdf
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Inventaire des Zones d'Aptitude aquacole du Littoral Français volume 1 : conchyliculture ArchiMer
Gaignon, Jean-louis; Mazurie, Joseph; Loarer, Ronan; Youenou, Gilles.
La France est l'un des premiers pays consommateurs de produits de la mer (19 kg/habitant/an). Malgré un linéaire de côtes important et des conditions naturelles favorables à la culture des mollusques, notre pays n'est pas auto-suffisant: de l'ordre de 40 000 t de moules par an (poids frais entier), et autant (en équivalent frais) de coquilles Saint-Jacques et pétoncles sont importées chaque année.
Tipo: Text
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00083/19402/16995.pdf
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Inventaire des Zones d'Aptitude aquacole du Littoral Français volume 2 : pisciculture ArchiMer
Gaignon, Jean-louis; Mazurie, Joseph; Loarer, Ronan; Youenou, Gilles.
L'étude de zonage des cultures marines qui a été confiée à l'Ifremer a été envisagée dans un premier temps comme la collection d'éléments disponibles, fruit de travaux passés. Cette approche s'est avérée peu pertinente pour la pisciculture. En effet, les travaux déjà réalisés datent de plusieurs années (1975 - 1985). Depuis, les techniques d'élevage, les structures de production et donc les critères de choix de sites ont considérablement évolué. Les sites retenus étaient principalement littoraux, caractérisés par un haut degré de protection vis-à-vis des tempêtes. Les site-types étaient le moulin à marée, le fond de baie.
Tipo: Text
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00083/19401/16994.pdf
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La domestication des Gadidés : le cas de la morue et du lieu jaune ArchiMer
Suquet, Marc; Fauvel, Christian; Gaignon, Jean-louis.
The term "domestication" has a legislative meaning when it applies to species submitted to selection pressures, but also a literary one, according to the time since which the species live closed to men and the possibility of controlling their reproduction. In terms of legislation, none of both species of gadids object of this article, cod and pollack, can be considered as domestic. From a literary point of view, 140 years of research and the control of the reproduction, give to the cod a domestic status. It is not the case with pollack, only studied since ten years and the reproduction of which is still badly controlled. The weak differences observed between the performances of breeding and wild cods focuse the still limited impact of the domestication on...
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Ano: 2004 URL: http://archimer.ifremer.fr/doc/00272/38282/36471.pdf
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La pisciculture marine en France ArchiMer
Dosdat, Antoine; Gaignon, Jean-louis; Fuchs, Jacques; Harache, Yves; Lacroix, Denis; Paquotte, Philippe; Thouard, Emmanuel.
Tipo: Text
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00344/45564/45162.pdf
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Pollack (Pollachius pollachius): Acquisition of biologic data in a breeding purpose ArchiMer
Buchet, Vincent; Suquet, Marc; Omnes, Marie-helene; Petton, Bruno; Normant, Yvon; Severe, Armelle; Quemener, Loic; Barone, Herve; Fauvel, Christian; Gaignon, Jean-louis.
The fishing of pollack which concerns essentially, France, United Kingdom and Norway, and at a lower level Ireland and Denmark, is situated between 10 and 15000 tons a year. In 1996, France was the first producer of Pollack. Since 1980, a decrease of production is observed in Europe. In France, landing reached 3000t. in 1998 (Suquet, 2001). However, the demand remaining strong, aquaculture could be a solution to satisfy the deficit between the French production and the domestic demand.
Tipo: Text
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00170/28144/26365.pdf
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Production de Saumon Atlantique (Salmo salar L.) Juveniles et Adultes sur un Ruisseau Pepiniere de Bretagne Nord (France) a Partir d'une Souche Irlandaise. ArchiMer
Prouzet, Patrick; Gaignon, Jean-louis.
An extensive restocking experiment has been undertaken in 1977 on a tributary of Elorn river in the framework of an Atlantic salmon management program of this river of northern Brittany. The results gathered during this experiment permitted the analysis of S. salar production during the juvenile and adult stages from immersion of unfed fry of Irish origin in small nursery streams. The annual production during the first year represented 72% of the total production of two years of growth. Adult runs into the nursery stream were observed between mid-November and mid-December. These runs were initiated by high increases of flow rates of the nursery stream. The whole of the adult population is constituted by late grilses whose female. Their rate of return was...
Tipo: Text Palavras-chave: France; Brittany Salmo salar Growth Spawning Stocking (organisms) Migrations.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-1904.pdf
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Programme de repeuplement - "Sea Rancing" en Salmonidés migrateurs - Production de juvéniles saison 80-81 ArchiMer
Gaignon, Jean-louis; Prouzet, Patrick.
Ce document a pour but de fournir l' ensemble des résultats et des observations recueillis au cours d 'une saison dans le cadre de programmes CNEXO . En effet, si certaines données sont obtenues grâce à des expériences originales et dans ce cas font ou feront l'objet de publications, d'autres constituent de simples notes ou essais qui peuvent représenter globalement une expérience susceptible de pouvoir aider à l'amélioration de techniques de production nécessaires au développement de l'activité Aquaculture - Repeuplement. Il a en outre la particularité de fournir des données sur des sujets dont l 'homogénéité n'apparaît peut - être pas évidente au lecteur élevage intensif de juvéniles. repeuplement, "Sea Ranching", gestion des stocks. Pourtant il n' y a...
Tipo: Text Palavras-chave: Aquaculture; Salmo salar; Saumon atlantique; Production; Juvénile; Repeuplement; Gestion de stocks.
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00078/18902/16488.pdf
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Repeuplement et soutien aux ressources halieutiques - Etat des connaissances et recommandations ArchiMer
Gerard, Andre; Thouard, Emmanuel; Zambonino, Jose-luis; Gaignon, Jean-louis; Antoine, Loic; Harache, Yves; Veron, Gerard; Perez, Jose.
The repopulating of aquatic environments has long been based on the idea that in order to increase halieutic resources, one just had to artificially increase the number of fish in their early stages in marine or fresh water environments. Therefore, as the knowledge on the reproduction of some species and the mastery of their artificial reproduction was growing, the capacity to produce large amounts of eggs or fries from different fish or mollusc species became a reality. Controlled reproduction and the availability of large quantities of fertilized eggs, and then of larvae showing, in captivity, a greater survival capacity than naturally reproduced ones, lead to an increase of repopulating attempts through the release of fries or young fishes raised in...
Tipo: Text Palavras-chave: Recommandation; Repeuplement; Milieu aquatique; Ressources halieutiques.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/rapport-6532.pdf
Registros recuperados: 22
Primeira ... 12 ... Última
 

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