|
|
|
| Registros recuperados: 44 | |
|
|
| Girin, Michel; Devauchelle, Nicole. |
| Sea bass (Dicentrarchus labrax), turbot (Scophthalmus maximus) and gilthead sea bream (Sparus aurata) spawners were kept in 2 identical 40 m3 tanks, one outdoors (control) and one indoors (test) during a 5-year experiment. The control tank was under natural yearly photoperiod and the temperature cycles of western Brittany. The test tank was under similar variation for 3 years but with the cycles compressed into 10 months. The 3 species spawned naturally in these artificial conditions at various stages of the experiment. After 3 years, the fish in the test tank spawned an average 5 months ahead of the others. [NOT CONTROLLED OCR] |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-5229.pdf |
| |
|
| |
|
|
| Devauchelle, Nicole. |
| In order to develop an intensive marine fish production, it is necessary to obtain in a first time the captive spawners maturation. The results presented herein show that red mullus mullus surmuletus is an easy species for acclimatization in 20 m3 tanks : only one year after seining the fish in a breton coastal pond, several spawns were produced each year between 1975 and 1983, at the same period : April to beginning of 3une. The average number of eggs corresponding to one oviposition is estimated to 33 000. The diameter of fecund eggs is small : 0.81 to 0.94 mm. Their mean viability appears to be high : 90 %, as the hatching rate : 95 % obtained from viable eggs, at constant temperature (13 ± 0.5°C). In these conditions larval deformities get up rarely... |
| Tipo: Text |
|
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/00048/15931/13357.pdf |
| |
|
|
| Devauchelle, Nicole; Barret, Jean; Salaun, Gilles. |
| This report compiles 17 short and illustrated syntheses concerning the natural strategies of reproduction and the artificial control of the reproductive process for the flat oyster, Ostrea edulis, the japanese oyster, Crassostrea gigas, the mussels, Mytilus edulis and My ti/us galloprovincialis, the scallop, Pecten maximus. An additional syntheses is presented, as a comparison within molluscs, which are the main research topics at IFREMER concerning the artificial control of the reproductive processes in Marine Fish. Three main subjects are documented : 1. the ecophysiology of the natural period of reproduction in the wild, 2. the methods developed in the hatcheries for the artificial control of the reproductive periods, the gametes collection and the... |
| Tipo: Text |
Palavras-chave: Bivalves; Stratégie de reproduction; Contrôle artificiel; Gonades; Gamètes; Coquille St Jacques; Moules; Huîtres; Nourriture; Photopériode; Température; Biologie; Physiologie; Biochimie.; Bivalves; Reproductive strategy; Artificial induction of reproduction; Gonads; Gametes; Scallop; Mussels; Oysters; Food; Light; Temperature; Biology; Physiology; Biochemistry.. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00043/15441/12811.pdf |
| |
|
|
| Paulet, Yves-marie; Bekhadra, Farida; Devauchelle, Nicole; Donval, Anne; Dorange, Germaine. |
| This work is part of the program, "recruitment determinism in scallops" initiated in 1992 by the "Contrat de Baie". The aim of this research was to explain interannual abundance fluctuations observed for Pecten maximus, in the Bay of Brest. To this end an analytical approach to the life cycle of the species was undertaken to determine its critical phases. A phase may be considered as "critical" if the mortality rate at its level varies from one year to the other. Using data from 1989 to 1994, a precise time-table of the "physiological year" of the scallop in the Bay of Brest was determined. Fecundity and gamete production kinetics were estimated from the annual variation in the weight indices of the gonad. In the laboratory, egg quality was estimated... |
| Tipo: Text |
Palavras-chave: Pecten maximus; Recruitment; Reproductive cycle; Digestion. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00044/15495/12861.pdf |
| |
|
|
| Devauchelle, Nicole. |
| This work describes the results of some esperiments carried out on the effect of the temperature, the photoperiod, the spawners food regime and other biotic factors upon the captive brood stock of Sea Bass (Dicentrarchus labrax), Turbot (Scophtalmus maximus), Sole (Solea solea), Gilthead Sea Bream (Sparus aurata and Red Mullet (Mullus surmuletus). The results clearly show that ail the above species spawn naturally in captivity conditions. A number of spawns can be obtained in tanks where only one species or a pool of species is maintained under natural or artificial temperature and photoperiod, with fish receiving différent types of food diet and in tanks of varying capacity. The characteristics of each spawn varies according to the following factors : -... |
| Tipo: Text |
|
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00045/15578/12981.pdf |
| |
|
|
| Lubet, P; Devauchelle, Nicole; Muzellec, M; Paulet, Y; Faveris, R; Dao, Jean-claude. |
| Bay of Seine, bay of St. Brieuc and the rade of Brest are the three main fisheries in France. Measurements made on spawners issued from these areas allow to consider two separate reproductive strategies, in these populations. Scallops from St Brieuc spawn during a short period, a sexual rest stage being observed in autumn and winter and recovery occurring in spring. Populations from Brest and from bay of Seine show similar reproductive cycle with a permanent annual sexual activity spawning being scattered from early spring to autumn. This reproductive strategy could explain that recruitment in these fisheries are better than in St Brieuc bay. The variations of the muscle and gonad index are opposite. The muscle acting as storage organ releasing metabolites... |
| Tipo: Text |
|
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00049/15984/13427.pdf |
| |
|
| |
|
|
| Gerard, Andre; Naciri, Yamama; Coatanea, Denis; Martin, Anne-genevieve; Barret, Jean; Claude, Serge; Heurtebise, Serge; Devauchelle, Nicole; Joly, Jean-pierre; Goulletquer, Philippe; Baud, Jean-pierre; Nourry, Max; Bougrier, Serge; Renault, Tristan; Cochennec, Nathalie; Chollet, Bruno; Le Deuff, Rose-marie; Peignon, Jean-marie. |
| La discussion générale organisée à la fin de la deuxième journée a fait ressortir les points suivants: 1- Les participants se sont déclarés satisfaits de la tenue de la réunion, tant dans son déroulement, que dans les échanges d'informations auxquels elle a donné lieu. La quantité et la qualité des résultats présentés a permis de mettre en évidence la puissance d'analyse que représente le travail en réseau. 2-L'importance de la valorisation des résultats a été soulignée à plusieurs reprises. La diffusion de l'information devrait se faire dans un premier temps par la voie de rapport internes à la DRV, puis par la voie d'articles publiés dans des revues scientifiques. Sur le programme "C. gigas triploïdes", une première diffusion des résultats obtenus en... |
| Tipo: Text |
Palavras-chave: Génétique; Sélection génétique; Huître plate; Ostrea edulis; Génétique population; Croissance. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00049/15981/13423.pdf |
| |
|
| |
|
|
| Larvor, H.; Cuif, J.p.; Devauchelle, Nicole; Dauphin, Y; Denis, A; Gautret, P; Marin, F. |
| Calcification abnormalities linked to a brown coloration of the internal layer of the valves have been observed on scallops - Pecten maximus - in different rearing sites of Brittany. Scanning electronic microscopic (SEM) observations demonstrate that the brown pigmentation is associated with various modifications of the foliated microstructure of the internal layer of the shell. Very brown shells have been compared to healthy white shells with different methods. According to the amino acid analyses, the production of the soluble organic matrices appears to be preserved in the diseased shells. A small but significant decrease in the aspartic acid content has been observed in the insoluble organic matrix of the brown shells. The Ca content is the same in the... |
| Tipo: Text |
|
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00048/15929/13355.pdf |
| |
|
| |
|
|
| Lucas, Albert; Devauchelle, Nicole. |
| Les échanges de Matériels vivants apparaissent comme une caractéristique constante de toute aquaculture, y compris de la conchyliculture traditionnelle. Ils interviennent par exemple sous forme d'animaux adultes mis sur le marché pour être consommés vivants, ou sous forme de naissain ou d'alevins d'importation, ou encore lors des essais d'acclimatation d'une espèce étrangère en vue de sa culture. A cela s'ajoutent les transferts au cours du développement : c'est ce dernier aspect qui retiendra surtout notre attention. Dans la mesure où l'aquaculture nouvelle cherche à maîtriser tous les stades du développement de l'œuf à l'adulte, les échanges ou transferts d'animaux vivants deviennent obligatoires : en effet, on ne saurait réaliser au même endroit... |
| Tipo: Text |
|
| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00049/16001/13446.pdf |
| |
|
|
| Devauchelle, Nicole. |
| Optimal gametogenesis and egg-laying environment, fertility, number of egg-layings, reproductor ageing, relationship between parent characteristics and conditioning and farming success, are the main issues considered by bivalve hatcheries each time the reproduction of a species is taken care of. Even if there is still very little bibliographic data on this precise field, reproduction mechanisms have been studied for decades in Mytilidae and Ostreidae. Largely cultivated in open sea, they are indeed an experimental material of choice. In this paper, we will see how the acquired knowledge and the methods developed on this material can be used to carry out a study on bivalve reproduction in hatcheries. |
| Tipo: Text |
Palavras-chave: Ecloserie; Reproduction; Mollusque; Ostreidae; Mytilidae. |
| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/1987/acte-6196.PDF |
| |
|
|
| Devauchelle, Nicole; Cladas, Y. |
| Le but du travail présenté ici est d'établir des corrélations entre les caractéristiques métriques des oeufs et les taux d'éclosion et de malformation de larves vésiculées. Les résultats indiquent que certains des paramètres étudiés pourraient être, utilisés en tant que critères de la qualité des oeufs. En effet, des corrélations significatives sont établies entre les caractéristiques des oeufs et celles des larves. En particulier, les variations de taux d'humidité et de pouvoir d'éclosion sont proportionnels, ainsi que celles des diamètres et des poids secs des oeufs. Par contre, les taux d'humidité et le poids sec des oeufs ou le taux de malformation des larves sont inversement proportionnels. Enfin, l'ensemble des tests statistiques tendent à montrer... |
| Tipo: Text |
|
| Ano: 1982 |
URL: http://archimer.ifremer.fr/doc/00048/15932/13358.pdf |
| |
|
|
| Larvor, Helene; Devauchelle, Nicole; Cuif, Jean Pierre. |
| Calcification abnormalities linked to the appearance of a brown coloration of the internal shell layer are observed in scallops Pecten maximus in the Brest roadsted. It is a widespread phenomenon in shallow waters (about 3 to 10 meters) sometimes associated with an important boring parasitism at the ultimate stage of development. This brown color which can generate a decrease of the consumer appraisal does not affect the commercial value of the shellfish (muscle and gonad quality) when it is not too high. When it covers the all shell with a deap brown color the animal shows many signs of weakening. The color of the internal layer of the valves is due to the presence of a brown pigment, an eumelanin, associated with the insoluble organic matrix of the... |
| Tipo: Text |
|
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00044/15496/12862.pdf |
| |
|
| |
|
|
| Devauchelle, Nicole. |
| La révolution des techniques utilisées en biologie cellulaire ces vingt dernières années donnent une conception nouvelle et évolutive du fonctionnement et de l'architecture de la cellule. L'intégration de ces données est indispensable au travail du biologiste attaché au développement, de l'aquaculture, comme à celui de tout autre biologiste. L'utilisation des nouvelles techniques n'est toutefois pas nécessaire à toutes les recherches. La biologie moléculaire et cellulaire a ses domaines de prédilection. Nous allons tenter, dans la première partie de ce rapport, de pointer ceux qui en aquaculture peuvent en bénéficier le plus. La seconde partie illustrera concrètement nos propos. |
| Tipo: Text |
|
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/00044/15539/12916.pdf |
| |
| Registros recuperados: 44 | |
|
|
|
