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| Registros recuperados: 45 | |
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| Le Foll, Anne. |
| The study of the crab Cancer pagurus , along the Brittany coast, has revealed new information about its movements, growth and reproduction. The 1439 crab tagging has been effected either on land using the Edwards technique "suture-tag" or onboard using a similar technique to the Gundersen method of "toggle-tag". The results confirm that males are relatively sedentary, the females migrate more. To estimate growth, the author used the "capture-recapture" method and the results from crab rearing. It appeared that the molt increment is not constant and generally, so the molt frequency, it percentage decreases when the size increases. |
| Tipo: Text |
Palavras-chave: Marine crustaceans; Sexual reproduction; Tagging; Growth; Migrations. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/publication-1785.pdf |
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| Sarano, F. |
| The present work analyses and describes Merluccius merluccius ovarian cycle in the Bay of Biscay as an example of partial spawner. Three methods were employed: a macroscopic examination of about 10,000 ovaries -- a cytologic and histologic study -- an investigation of the size structure of the oocytes population of 63 ovaries. The author developed an original mathematical method for serial spawning demonstration. He demonstrates that hake is a partial spawner: a female usually rapidly spawns 4 or 5 times without ovaries rest. On this basis, he gives a new reference scale of the maturity stages of the ovarian cycle: after developing (II), ripe (III), running (IV), the partly spent ovary is named (II+); the repetitive sequence III-IV-II + characterize serial... |
| Tipo: Text |
Palavras-chave: Pisces; Animal reproductive organs; Spawning; Ovaries; Sexual reproduction. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/publication-1790.pdf |
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| Les seiches, poulpes, calmars et nautiles forment la Classe des Céphalopodes de l’Embranchement des Mollusques de grande taille, exclusivement marins. Leur croissance est rapide, leur arrivée à la maturité sexuelle précoce et leur durée de vie courte. Le poulpe a une très large aire de distribution incluant les eaux maritimes tropicales. Elle abonde surtout en Méditerranée, dans les eaux japonaises (Océan Pacifique) et dans l’Atlantique Centre-Est qui s’étend du Maroc à l’Angola. La pêche du poulpe s’est développée au large du Sahara dans les années 1960. Son importance dans la zone du COPACE notamment, au Maroc, en Mauritanie et au Sénégal, s’expliquerait par la raréfaction de ses prédateurs potentiels (Serranidés, Sparidés). Au Sénégal, elle est... |
| Tipo: Other |
Palavras-chave: Octopus fisheries; Fishery legislation; Trade; Sexual reproduction; Fishing effort; Fishing fleet; Security; Fishing licenses; Habitat (natural); Agreements. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4577 |
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| DAVID,JEAN R.. |
| Developmental biology and evolutionary biology are both mature integrative disciplines which started in the 19th century and then followed parallel and independent scientific pathways. Recently, a genetical component has stepped into both disciplines (developmental genetics and evolutionary genetics) pointing out the need for future convergent maturation. Indeed, the Evo-Devo approach is becoming popular among developmental biologists, based on the facts that distant groups share a common ancestry, that precise phylogenies can be worked out and that homologous genes often play similar roles during the development of very different organisms. In this essay, I try to show that the real future of Evo-Devo thinking is still broader. The evolutionary theory is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Quantitative genetics; Multicellularity; Analogy; Homology; Sexual reproduction. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300008 |
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| Benmeradi, N. |
| During the reproductive period, the microscopical observation of Patella coerulea ovary shows some ovogonies forming neets, supported by a conjonctive network, previtellogenic oocytes which leave gradually the conjonctive tissue and vitellogenic oocytes isolated in the acinus lumen. In early stages of previtellogenesis, an important nucleolar activity, caracterised by cloud-shaped or nematosomes and ribonucleoproteinic extrusions in cytoplasm compartment can be observed. At the end of this stage, the oocyte becomes richer in organites, mitochondria, granular endoplasmic reticulum and Golgi. We further notice the outcome of the first vitellin platelets. Production of vitellus is higher as three kinds of vitellus are observed in the following order: dark... |
| Tipo: Text |
Palavras-chave: Ultrastructure; Oogenesis; Sexual reproduction; Vitellogenesis. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/acte-1720.pdf |
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| Registros recuperados: 45 | |
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