|
|
|
| Registros recuperados: 39 | |
|
| |
|
|
| Buestel, Dominique; Nicolas, R.; Morize, E.; Rohan, R.; Latrouite, Daniel; Le Borgne, Y.; Cochard, Jean-claude; Flassch, Jean-pierre; Uno, Yutaka; Audouin, Jacques; Legall, J.y.; Jezequel, M.; Lorec, J.; Henocque, Yves; Reveche, C.; Girin, Michel; Laurec, Alain; Herry, P.. |
| L'aquaculture extensive et le repeuplement sont deux modes d'exploitation des ressources halieutiques qui ne font appel, une fois les juvéniles produits, ni à un apport de nourriture artificielle, ni à un contrôle continu de la part de l'exploitant, mais dépendent par contre de la productivité du milieu marin, Cette approche repose sur l'idée que le principal facteur limitant d'une population naturelle est le faible nombre de survivants après les premiers stades, et que l'on peut par alevinage, aménagement du milieu ou autres techniques, augmenter la production d'une espèce exploitable, Le but de ces journées d'étude est de faire le point des connaissances sur ces sujets, à l'intention des scientifiques mais aussi des utilisateurs, Il a paru souhaitable de... |
| Tipo: Text |
|
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00018/12941/9907.pdf |
| |
|
|
| Linard, Clementine; Gueguen, Yannick; Moriceau, Jacques; Soyez, Claude; Hui, Belinda; Raoux, Aurore; Cuif, Jean Pierre; Cochard, Jean-claude; Le Pennec, Marcel; Le Moullac, Gilles. |
| Marine mollusc shell growth has been widely measured using fluorochrome marking. In order to test the efficiency and reliability of calcein staining on P. margaritifera shells and pearls, the present study examined two administration methods, different concentrations and several immersion times.Immersion in a 150 mg.L-1 calcein solution for 12 h to 24 h appeared to be the best method for marking P. margaritifera shells. For pearl marking, injection of a 200 mg.L-1 calcein solution into the pearl pouch was the optimal method. Calcein marking was then used to measure the influence of food resource levels on the shell growth. Groups of 23-month-old P. margaritifera were fed at three trophic levels for two months. The two highest food levels tested (6 000... |
| Tipo: Text |
Palavras-chave: Bivalvia; Pearl; Shell; Growth; Scanning electron microscope. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00028/13907/11195.pdf |
| |
|
|
| Chevolot, Lionel; Cochard, Jean-claude; Yvin, Jean-claude. |
| Delayed metamorphosis usually occurs when scallop Pecten maximus (L.) larvae are reared in still water. Metamorphosis rates may be increased by adding aqueous extracts of certain marine red algae, including one [Delesseria sanguinea (Linne) Lamouroux (Delesseriaceae, Rhodomelaceae)] from which various chemical inducers have been isolated. Of these, jacaranone (a simple quinol) is by far the most active component; other components (p-OH phenylacetic acid methyl ester, p-OH benzaldehyde, p-OH benzyl alcohol) are only weak inducers. All are catabolic derivatives of tyrosine. Homogentisic acid (biosynthetically related to jacaranone) and some catecholamines (L-DOPA, epinephrine) can also induce metamorphosis of P. maximus larvae. All these compounds can be... |
| Tipo: Text |
|
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00182/29348/28137.pdf |
| |
|
|
| Vonau, Vincent; Matehau, Ariora; Rouxel, Catherine; Cochard, Jean-claude. |
| La congélation du sperme et des embryons d'huîtres perlières est un moyen de renforcer la sécurité du potentiel économique que représente la Perliculture en Polynésie Française. Elle permet la conservation, à faible coût, de la biodiversité ex-situ des populations d'huîtres perlières sauvages et des génotypes de sujets présentant un intérêt particulier pour l'industrie de la perle. Un avantage complémentaire de la cryoconservation sera de faciliter l'avancement des programmes d'amélioration génétique. À ce jour, les divers travaux réalisés sur les gamètes des mollusques bivalves ont permis de congeler la laitance de différentes espèces autres que Pinctada margaritifera. Cependant, quelle que soit l'espèce, le protocole complet n'a pas été validé pour... |
| Tipo: Text |
|
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00304/41501/40709.pdf |
| |
|
|
| Jacq, E; Moal, Jeanne; Samain, Jean-francois; Corre, S; Daniel, J; Nicolas, Jean-louis; Cochard, Jean-claude; Fera, P. |
| Larval rearings were performed with seawater either freshly pumped or after storage in a pond. Concerning bacterial populations these waters were characterized by a high diversity, little sized bacteria whose few of them (1%) were cultivable on Zobell medium. In the tanks, the bacterial ecosystem was modified by the presence of antibiotics, larvae and algae: the diversity was lowered, the cellular volume was increased by a factor 2 to 5, 100% bacteria were cultivable and chloramphenicol resistant, and their metabolism changed. Taxonomic screening showed no differences among the two waters neither at the beginning nor at the end of the rearings. However, depending on the water (stored or not) differences were identified for bacterial physiology and... |
| Tipo: Text |
Palavras-chave: Marine aquaculture; Pond culture; Scallop culture; Ecology; Antibiotics; Organic matter; Grazing; Carbohydrates; Mathematical models; Modelling; Growth; Bacterial diseases; Biological production; Culture tanks; Larvae; Rearing. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-914.pdf |
| |
|
|
| Gauquelin, F; Cuzon, Gerard; Gaxiola, G; Rosas, C; Arena, L; Bureau, D; Cochard, Jean-claude. |
| A study was conducted using a bioenergetics approach to generate information on energy requirement and feed utilization of Litopenaeus stylirostris. Animals (initial mean weight 21 +/- 1 g were fed ad libitum six experimental diets, ranging from 25 to 58% crude protein (CP), for 50 days. Weight gain increased from 21 to 30 g with increasing dietary protein level. Survival rates averaged 80%. Basal metabolism (HeE) and heat increment of feeding (HiE) were monitored using respirometry. HeE was on average I U shrimp(-1) day(-1) or 47 U kg live weight(-1) day (22 kJ/kg(0.8). d(-1)), slightly more than what is observed in fish. HiE averaged 0.2 W/sbrimp(-1) day(-1) or 10 W kg live weight(-1) day(-1) (4 kJ/kg(0.8) d(-1)). It represented 3 1 % and 12%... |
| Tipo: Text |
Palavras-chave: Respiration; Excretion; Growth; Dietary protein; L. stylirostris. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-6263.pdf |
| |
|
|
| Le Moullac, Gilles; Hui, Belinda; Vonau, Vincent; Levy, Peva; Cochard, Jean-claude. |
| Preliminary experiments allowed defining basic requirements of Pinctada margaritifera for somatic and gonadic growth in controlled conditions. This study was continued by observation of the gametogenesis at a cellular level. In April/May 2008, 125 oysters were conditioned for 30 days in 25 tubular tanks (30 L). Water was renewed 4 times/hour. A mixed (v:v) diet of Isochrysis galbana (T-Iso) and Chaetoceros gracilis was supplied continuously. A control batch of 125 oysters was maintained in trays in the lagoon. An initial sample of 30 individuals was made. Gonadic changes were first characterized using a gonadal development index (GDI) based on the ratio of the gonad area to the total visceral mass area on a sagittal section of the body. Histological... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Reproduction; Gametogenesis; Broodstock. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00029/14010/11196.pdf |
| |
|
|
| Samain, Jean-francois; Cochard, Jean-claude; Chevolot, Lionel; Daniel, Jean-yves; Jeanthon, C.; Le Coz, Jean-rene; Marty, Y.; Moal, Jeanne; Prieur, D.; Salaun, Michele. |
| Some positive growth differences can be observed, all year long, in Pecten maximus larvae cultivated in an old fishpond, compared with the water which flows into it periodically. These waters are filtered at 1 µm through CUNO cartridges. Moreover, the larvae are cultivated in the same light, temperature and food (cultured phytoplankton) conditions. This difference is significant in terms of larvae size, dry weight, organic matter, ashes, total proteins, glycogen, and lipids. A series of preliminary observations on the chemical composition of these two waters after filtration (amino acids, fatty acids, organic mater, nutritive salts), on the bacterial flora (total, heterotrophic organisms, vibrio), on the particular material using electron microscopy, on... |
| Tipo: Text |
Palavras-chave: Larve; Ecloserie; Pecten maximus; Facteur croissance; Qualité eau. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/acte-6185.PDF |
| |
|
|
| Cochard, Jean-claude; Flassch, Jean-pierre. |
| Due to the lack of regulation allowing commercial exploitation of abalone (Haliotis tuberculata), French research was directed towards a half extensive aquaculture starting from hatchery juveniles and using the natural production of macrophyte algue of rocky intertidal areas. Spat is produced in the Argenton hatchery (Western Brittany) with an original high density technique (4 000 juveniles of 8 months/m2). About 55 000 juveniles are produced each year and immersed in habitats of 3 types. |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/1979/publication-6043.pdf |
| |
|
| |
|
|
| Le Fevre, Jacques; Grall, Jean-rené; Cochard, Jean-claude. |
| L'écosystème pélagique côtier au voisinage du site d'Erdeven subit principalement l'influence de la température et du régime de circulation des eaux, lequel dépend lui-même en partie des conditions thermiques. L'influence directe de la température sur les organismes vivants se traduit dans la succession des maxima des divers organismes zooplanctoniques et par l'émission, à une période de l'année bien définie, des larves par les animaux benthiques. La modification des conditions thermiques retentirait donc sur la reproduction de ces animaux, ce qui mérite d'être pris en considération en raison de l'intérêt économique de certains d'entre eux (Huitres, Poissons, Crustacés). Le régime de circulation des eaux se situe, selon les conditions météorologiques,... |
| Tipo: Text |
|
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/00005/11637/8295.pdf |
| |
|
| |
|
|
| Cochard, Jean-claude. |
| Avec environ 20 000 tonnes de production annuelle, la pêche de la coquille Saint-Jacques Pecten maximus occupait jusqu'en 1978 une place importante dans les apports des pêcheries françaises. En raison de la surexploitation de stock, les captures en Baie de Saint Brieuc ont chuté de 12 000 tonnes en 1972 à environ 4 000 tonnes. En Rade de Brest qui avant 1963 produisait 1 000 à 2 000 tonnes par an, les débarquements stagnent au-dessous de 100 tonnes. Afin d'augmenter le recrutement en Baie de Saint Brieuc, un captage de naissain inspiré des méthodes japonaises a été mis au point. Cependant, en raison du faible nombre de reproducteurs, la reproduction naturelle ne permet plus sur cette zone le captage d'un nombre suffisant de juvéniles pour le repeuplement.... |
| Tipo: Text |
|
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/00108/21968/19568.pdf |
| |
|
|
| Cochard, Jean-claude. |
| Les crevettes pénéides maintenues captives dans des cages posées sur le fond des bassins d'élevage subissent un stress dû au sédiment qui peut être évalué par la comparaison entre la valeur de la pression osmotique de leur hémolymphe et celle des crevettes libres du même bassin. Les objectifs des travaux réalisés à la station de Saint-Vincent (SASV, Nouvelle Calédonie) étaient de confirmer la variabilité spatiale de l'intensité du stress et de rechercher dans les sédiments un indicateur physique ou chimique corrélé à ce stress. Des lots de 25 à 30 crevettes de 13,2g, pêchées à l'épervier, ont été placés dans des cages de grillage métallique déposées en 12 points du bassin d'élevage. Les cages ont été relevées au bout de 24 heures et la pression osmotique... |
| Tipo: Text |
Palavras-chave: Penaeus stylirostris; Capacité osmorégulatrice; Stress; Sédiment; Aquaculture; Crustacés. crevettes pénéides; PH. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00131/24265/22263.pdf |
| |
|
|
| Soyez, Claude; Tiapari, Jerome; Teissier, Hinano; Cochard, Jean-claude. |
| En Polynésie française, la perliculture s'est développée à partir de naissain de captage. Les transferts de juvéniles entre les îles ont conduit à une certaine uniformisation des populations mais l'huître perlière reste essentiellement un animal sauvage (Arnaud et al. ,2003). Une des voies d'amélioration de la qualité des perles et de la rentabilité de la perliculture repose sur la sélection d'individus intéressants et/ou plus performants en particulier comme donneurs de greffons (couleur). L'étape qui consiste à multiplier les animaux sélectionnés passe nécessairement par le contrôle de la reproduction. Les travaux menés dans le cadre de précédentes conventions sur la triploïdisation, la cryoconservation et la maturation ovocytaire (Te Reko Parau N°16 et... |
| Tipo: Text |
|
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00304/41517/40725.pdf |
| |
|
| |
|
|
| Le Moullac, Gilles; Soyez, Claude; Sham-koua, Manaarii; Levy, Peva; Moriceau, Jacques; Vonau, Vincent; Maihota, Mayalen; Cochard, Jean-claude. |
| This study aimed to model the food intake of P. margaritifera in order to examine the relationship between food level and reproductive activity. The effect of microalgae concentration on ingestion rate and assimilation efficiency was studied over a broad concentration range, using a mixture of Isochrysis galbana and Chaetoceros gracilis. Reproductive effort was assessed using three microalgae concentrations of 0.5, 7 and 18 cell μL-1. Reproductive status was assessed by gonad development index (GDI) – the ratio of the gonad surface to the visceral mass surface – and histological analysis of the gonad based on the presence (continuous or discontinuous) or the absence of gonial cells (GC). Ingestion is a saturating function of seston concentration for... |
| Tipo: Text |
Palavras-chave: Pinctada margaritifera; Food level; Ingestion rate; Reproduction; Gametogenesis. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00050/16085/13562.pdf |
| |
|
|
| Hui, Belinda; Demoy-schneider, Marina; Vonau, Vincent; Le Moullac, Gilles; Moriceau, Jacques; Le Pennec, Marcel; Cochard, Jean-claude. |
| Cryopreservation is a useful tool for genetic improvement which has been applied to several bivalve mollusk species. It would allow to keep the gametes of selected individuals and to preserve ex-situ the biodiversity of wild populations of the black-lip pearl oyster Pinctada margaritifera threatened of standardization by the seed transfers between the islands in French Polynesia. The ability to cryopreserve spermatozoa would bring about significant benefits to the cultured black pearl industry. Sperm freezing supposes the control of different steps: preparation of breeders, sperm collection, evaluation of sperm quality and the freezing process itself. Broodstock conditioning in hatchery allows to obtain gametes from the pearl oyster. Sperm quality is... |
| Tipo: Text |
|
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00029/14043/11238.pdf |
| |
|
|
| Le Moullac, Gilles; Tiapari, Jerome; Teissier, Hinano; Martinez, Elodie; Cochard, Jean-claude. |
| The growth and reproductive cycle of cultured black-lipped pearl oysters, Pinctada margaritifera (L.), were studied in the Gambier Islands (134°52' W, 23°07' S) from September 2002 to August 2003. Temperatures were recorded throughout the year, revealing seasonal temperature variations between 22.3 °C and 27.8 °C. The mean annual chlorophyll a value, as computed from satellite data, was 0.188 ± 0.075 µg L-1. To study growth and reproduction, 720 two-year-old individuals were ear hung on longlines suspended at a depth of 7 m. Samples were taken twice a month to obtain the following measurements: shell height; wet weight of flesh and total oyster; dry weight of adductor muscle, mantle and visceral mass; and glycogen content. Gonad development was also... |
| Tipo: Text |
Palavras-chave: Pearl oyster; Pinctada margaritifera; Growth; Reproduction; Temperature; Chlorophyll; Seasonality; Gambier archipelago. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00040/15099/13570.pdf |
| |
| Registros recuperados: 39 | |
|
|
|
