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| Registros recuperados: 93 | |
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| Morizur, Yvon. |
| The average length at which female Nephrops norvegicus attain their first maturity was determined during 1977 and 1978 by following the presence of spermatophores and development of the ovaries. During 1978, females were sexually mature at the age of 2 but in 1977 they did not mature before the age of 3. The cumulative maturity curves are sigmoid, due to an overlapping of Gaussian curves. A logistic equation was developed to calculate the percentage of mature females at each length. There is no evidence that the present fishing levels reduce the chances of a female with developing ovaries to be fertilized, since 90 to 100% of such females bear spermatophores. |
| Tipo: Text |
Palavras-chave: Brittany; France; ANE; Crustacea; Nephrops norvegicus; Females; Growth; Sexual maturity. |
| Ano: 1983 |
URL: http://archimer.ifremer.fr/doc/1983/publication-2349.pdf |
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| Duhalde, G.B.; Introzzi, A.E.. |
| The concentration of nucleic acids (RNA and DNA)was reviewed, as well as the RNA/DNA coefficient, in white muscle and liver of Mugil brasiliensis adult females caught at the Mar Chiquita Coastal Laggon (37°30'S, 57°20'W)between September and March. Countrary to what observations in other species (Lepomis macrochirus and Clarias batrachus)have shown, i.e., a decrease in muscle RNA/DNA during gonadal maturation, Mugil brasiliensis would seem to maintain a proteic balance in equilibrium during the said period. No significant correlation was found between IGS and the RNA, DNA and RNA/DNA muscular variables. |
| Tipo: Journal Contribution |
Palavras-chave: Sexual maturity; Nucleic acids; DNA; Nucleic acids; Sexual maturity. |
| Ano: 1986 |
URL: http://hdl.handle.net/1834/2035 |
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| Debas, L; Fostier, A; Fuchs, Jacques; Weppe, M; Nedelec, Georges; Benett, A; Cauty, C; Jalabert, B. |
| The Polynesian grouper, Epinephelus microdon , was chosen as an experimental model in order to investigate about factors controlling sexuality in groupers. |
| Tipo: Text |
Palavras-chave: French Polynesia; Epinephelus microdon; Sex ratio; Sexual maturity; Sex hormones; Sex determination; Sex; Fish culture; Endocrinology; Reproduction; Sex reversal; Animal morphology. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/acte-1439.pdf |
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| Roberts Jr, D. |
| Circannual, diel, and lunal periodic mechanisms in naturally reproducing stocks of tropical and subtropical fishes are reviewed. Manipulations of biological clocks, used to control reproduction in captive broodstocks, are detailed. Experiments to induce controlled maturation and spawning in fishes either test efficacy of changing environmental conditions (regimes), or constant environmental conditions (controlled). Data have been generated in experimental/scientific studies, as well as applied research. Effects of controlled environmental regimes on serum steroids, gametogenesis, spawning, fry performance and egg quality are summarized for selected members of Centropomidae, Serranidae, and Sciaenidae. |
| Tipo: Text |
Palavras-chave: Sciaenidae; Serranidae; Centropomidae; Fish culture; Controlled conditions; Sexual maturity; Photoperiods; Fish eggs; Gametogenesis; Steroids; Animal reproductive organs; Brood stocks; Marine fish; Spawning; Sexual reproduction. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/acte-1437.pdf |
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| Registros recuperados: 93 | |
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