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| Registros recuperados: 672 | |
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| L'Herrou, Roger. |
| La ponte de la sardine en 1964 dans le golfe de Gascogne et sur le plateau celtique a été récemment étudiée à l'Institut des Pêches par S. Arbault et N. Boutin dans le cadre d'une travail plus général sur la répartition saisonnière des oeufs et larves de téléostéens, travail que résume une communication présentée au Comité du plancton. Les résultats exposés ici et limités à la seule sardine, font suite à l'étude des ces chercheurs et proviennent du dépouillement des pêches planctoniques de 3 campagnes d'hydrologie des pêches effectuées par la Thalassa et la Pélagia dans la même région du 26 avril au 9 mai 1966, du 13 février au 22 mars 1967 et du 16 mai au 7 juin 1967. |
| Tipo: Text |
Palavras-chave: Sardine; Reproduction; Ponte; Hydrologie; Golfe de Gascogne; Plateau celtique. |
| Ano: 1967 |
URL: http://archimer.ifremer.fr/doc/00142/25325/23402.pdf |
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| 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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| 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 |
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| Le Dantec, Jean. |
| Les premiers résultats de nos recherches ont été exposés dans une communication au Conseil International pour l'Exploration de la Mer en 1957. Ils pouvaient être ainsi résumés : Le cycle sexuel semble être moins long pour les huîtres cultivées sur parcs que pour celles fixées naturellement sur pieux. Un même animal est vraisemblablement capable de pondre au moins deux fois pendant les mois d'été. Le volume de gonade diminue progressivement, ce qui rend malaisée la distinction des stades macroscopiques permettant une étude statistique. La taille des ovocytes diminue également pendant la saison; un nouveau matériel apparaît puis évolué (phénomènes de reconstitution permettant de prévoir des émissions tardives). |
| Tipo: Text |
Palavras-chave: Huître; Grypheae angulata; Reproduction; Bassin Arcachon; Gironde. |
| Ano: 1959 |
URL: http://archimer.ifremer.fr/doc/00004/11499/8069.pdf |
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| Cahu, Chantal. |
| This report is presented by Chantal Cahu for obtaining accreditation to supervise research. Since 1981, her research activity has addressed the study of reproducers' nutrition and the young stages of development of marine organisms belonging to two different branch lines, crustaceans and fish. This work, performed in a base-lined research body, IFREMER, is placed within a more general programme of aquaculture development. Indeed, whatever species are at issue, the development of aquaculture in France, as at the global level, is based on the production of juveniles in hatcheries. My work has therefore more precisely the goal of acquiring knowledge about the nutritional needs, mechanisms of digestion and the development of these animals in order to improve... |
| Tipo: Text |
Palavras-chave: Skeleton development; Vitamins; Nutriment; Fish larvae; Egg quality; Reproduction; Nutrition; Shrimp larvae; Peneids. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-2086.pdf |
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| Suquet, Marc; Malo, Florent; Quere, Claudie; Ledu, Christophe; Le Grand, Jacqueline; Benabdelmouna, Abdellah. |
| Triploidy induction in shellfish aims to obtain faster growth and sterility of reared individuals. Triploid Pacific oysters are most often not totally sterile, but have greatly reduced reproductive capacities compared to those recorded in diploid individuals. The description of gamete output in triploid aquatic animals is most often confined to the assessment of fecundity in females. The present work aims at further describing gamete quality of triploid Pacific oysters and comparing it to values observed in diploid individuals. Diploid and triploid oysters (produced by mating tetraploid males × diploid females) were reared in standard conditions and then transferred to the wild to allow the offspring to attain reproductive maturity. At the end of... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Reproduction; Triploidy; Gamete. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00277/38835/37581.pdf |
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| Bigot, Laetitia; Zatylny-gaudin, Celine; Rodet, Franck; Bernay, Benoit; Boudry, Pierre; Favrel, Pascal. |
| Gonadotropin-releasing hormone (GnRH), a key neuropeptide regulating reproduction in vertebrates has now been characterized in a number of non-vertebrate species. Despite the demonstration of its ancestral origin, the structure and the function of this family of peptides remain poorly known in species as distant as lophotrochozoans. In this study, two GnRH-related peptides (Cg-GnRH-a and CgGnRH-G) were characterized by mass spectrometry from extracts of the visceral ganglia of the Pacific oyster Crassostrea gigas. These peptides showed a high degree of sequence identity with GnRHs of other mollusks and annelids and to a lesser extent with those of vertebrates or with AKH and corazonins of insects. Both the mature peptides and the transcript encoding the... |
| Tipo: Text |
Palavras-chave: Mollusk; Bivalve; Oyster; Neuroendocrinology; Reproduction; GnRH. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00079/19003/17477.pdf |
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| Trochon, Pierre. |
| Chaque année, les laboratoires côtiers de l'Office Scientifique et Technique des Pêches Maritimes effectuent, dans le courant de l'été, des prélèvements de plancton et procèdent à des numérations de larves d'huîtres sur les échantillons récoltés. Les résultats numériques sont transmis aussi rapidement que possible aux ostréiculteurs et aux Administrateurs de l'Inscription Maritime, Chefs de Quartier, pour affichage. Ces résultats indiquent l'allure générale du phénomène de la reproduction des huîtres et donnent des renseignements sur les dates les plus favorables à la pose des collecteurs. Cependant, il a été quelques fois constaté que des fixations de larves se produisaient sur les collecteurs alors que les numérations étaient nulles. Nous avons entrepris... |
| Tipo: Text |
Palavras-chave: Reproduction; Larves; Huîtres; Gryphaea angulata; Marennes Oléron; Charente-Maritime; Numération larves. |
| Ano: 1952 |
URL: http://archimer.ifremer.fr/doc/00003/11457/8014.pdf |
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| Registros recuperados: 672 | |
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