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| Registros recuperados: 93 | |
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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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| Agostinho,Carlos Sérgio. |
| The viability of an alternative method for estimating the size at sexual maturity of females of Plagioscion squamosissimus (Perciformes, Sciaenidae) was analyzed. This methodology was used to evaluate the size at sexual maturity in crabs, but has not yet been used for this purpose in fishes. Separation of young and adult fishes by this method is accomplished by iterative adjustment of straight-line segments to the data for length of the otolith and length of the fish. The agreement with the estimate previously obtained by another technique and the possibility of calculating the variance indicates that in some cases, the method analyzed can be used successfully to estimate size at sexual maturity in fish. However, additional studies are necessary to detect... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Otolith; Sexual maturity; Plagioscion squamosissimus. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000400014 |
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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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| Cuadra, T. de la. |
| Datos de madurez sexual de la pinchagua (Ophisthonema spp.) y varios parámetros oceanográficos fueron comparados y analizados en forma de series de tiempo. Un análisis de Funciones Ortogonales Empíricas (EOF) mostro una fuerte relación con el índice de la Oscilación Decadal del Pacífico (PDO); en contraste no mostró nivel de asociación entre las variables oceanográficas locales y los estadios de madurez sexual de la pinchagua, ya que la variabilidad obtenida no fue común a todas las series. Por otro lado, el Análisis Espectral, determinó que existen varios aportes de energía a las series de tiempo con diferente origen que estarán asociados a la señal interanual identificada por un ciclo bienal irregular con periodicidades entre 1.5 y 2.5 años que... |
| Tipo: Journal Contribution |
Palavras-chave: Climate; El Nino phenomena; Spectral analysis; Sexual maturity; Oceanographic data; Reproduction (biology). |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4800 |
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| Miramand, Pierre; Bustamante, Paco; Bentley, Daniel; Koueta, Noussithe. |
| The developmental changes in the concentration of 8 essential and non-essential heavy metals (Ag, Cd, Cu, Co, Fe, Pb, V, Zn) in the tissues (digestive gland, cuttlebone and whole animal) of the common cuttlefish Sepia officinalis collected in the bay of the river Seine were monitored from the end of the embryogenesis until the adult reproductive stage. Compared to embryos, juveniles after hatching displayed much higher concentrations of Ag, Cu, Fe and Zn, suggesting an efficient incorporation from seawater. Conversely, the amounts of Cd, Pb and V in hatchlings remained constant suggesting that these metals are barely bioavailable for juveniles. Once the juveniles start to feed, the digestive gland appears to play a major role in the storage of all metals.... |
| Tipo: Text |
Palavras-chave: Embryogenesis; Sexual maturity; Cephalopods; Detoxification; Bioaccumulation; Trace element. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2330.pdf |
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| Cavalli, R.O.; Tamtin, M.; Lavens, P.; Sorgeloos, P.. |
| This study describes the variations in total lipid, lipid classes and fatty acids in the midgut gland (MG), ovary, and muscle tissue of wild-caught <i>Macrobrachium rosenbergii</i> to elucidate the importance of these components during sexual maturation. Mature females were captured in the Mae Klong River, Thailand, from July to September 1998, and divided into five groups according to their ovarian development. Total lipid levels in the ovary increased with maturation, but no concomitant decrease in MG lipids was observed. Thus, the lipid requirements of the developing ovary are thought to be more dependent on the immediate ingestion of dietary lipid than on MG reserves. Higher proportions of neutral lipids (NL), mainly triacylglycerols (TG),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biochemical composition; Fatty acids; Lipids; Muscles; Natural populations; Ovaries; Polyunsaturated fatty acids; Prawn culture; Sexual maturity; Macrobrachium rosenbergii; Thailand. |
| Ano: 2001 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6923 |
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| Registros recuperados: 93 | |
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