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| Registros recuperados: 93 | |
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| Fehri Bedoui, R.; Gharbi, H.; El Abed, A.. |
| Durant la période, mai 2000 à décembre 2001, un échantillonnage de mulet doré a été effectué dans différents points de débarquement de la pêche côtière des régions Est et Sud de la Tunisie. Le nombre total d’individus collectés était de 1245 dont 678 mâles et 567 femelles. La longueur totale était comprise entre 14 et 36,5 cm. Trois paramètres relatifs à la période de ponte et l’état physiologique du poisson ont été suivis pour les deux sexes. Le rapport gonado-somatique (RGS) montre que la période de ponte se réalise entre octobre et novembre. Le rapport hépato-somatique (RHS) et le coefficient de condition (Kc) indiquent que le Mulet doré utilisent les réserves hépatiques et musculaires pour la maturation des gonades. Durant la période de reproduction,... |
| Tipo: Journal Contribution |
Palavras-chave: Fish species; Reproduction (biology); Sexual maturity. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/185 |
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| García-Sáez, R.; Mendívez, W.; Chicaiza, D.. |
| De enero a diciembre de 2008 la flota arrastrera camaronera de Esmeraldas desembarcó un total de 322,3 t, el cual representó un decremento del 21.3 % con relación al 2007. Para la obtención de esta información se utilizó encuestas pesqueras (zonas y días efectivos de pesca, desembarques etc.) y biológicas (sexo, estadio gonadal y talla). La flota activa promedio estuvo compuesta por 19 barcos arrastreros camaroneros. La principal especie desembarcada fue el camarón café (Farfantepenaeus californiensis) la cual presentó un rango de tallas de captura entre 12,0 y 20,5 cm (LT), seguido del camarón rojo (F. brevirostris). En esta zona se registró un predominio de individuos hembras en estadio vacía e inmadura. |
| Tipo: Journal Contribution |
Palavras-chave: Trawlers; Landing statistics; Sexual maturity; Growth rate; Shrimp fisheries; Prawn fisheries. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4783 |
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| Barradas,José R. S.; Lermen,Isabel S.; Larré,Gabriel G.; Martins,Thaís P.; Fontoura,Nelson F.. |
| ABSTRACT A weight-length relationship was established for Corydoras paleatus (Jenyns, 1842) (Siluriformes, Callichthyidae) (n=596) from samples taken in November-December 2009 and March-April 2010, in Pinguela Lagoon (29°46'57"S; 50°11'16"W), Rio Grande do Sul, Brazil. The species showed a polyphasic allometric growth pattern, each stanza described by an independent power equation controlled by a switch function: W = a1Lb1 ∙ (1 + eRsc ∙ (L-SCP))-1 + a2Lb2 ∙ [1 - (1 + eRsc ∙ (L-SCP))-1] ; where W is the expected weight for a specific length L, a1 and a2 are the proportionality coefficients for stanzas 1 and 2, b1 and b2 are the allometric coefficients for stanzas 1 and 2, Rsc is the stanza changing rate for the switch function and SCP is the stanza changing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allometric growth; Length at first maturity; Reproduction; Sexual maturity; Length-weight relationship. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212016000100217 |
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| Hernández, D.R.; Fernández, M.B.. |
| Environmental preferences per size range of mature and impregnated females of shrimp Pleoticus muelleri (Spence Bate, 1888) (Crustacea, Decapoda, Solenoceridae) of the San Jorge Gulf, in Spring 2008 and Summer 2009. The relation between argentine red shrimp Pleoticus muelleri (Spence Bate, 1888) mature and impregnated females density values and environmental variables was analysed. Data derived from the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) research cruises carried out between 43° S-47° S and 64° Wand the coast during November-December 2008 and January-February 2009. The biological and environmental variables considered were density of mature and impregnated females per size range and depth, bottom water temperature and... |
| Tipo: Journal Contribution |
Palavras-chave: Females; Sexual maturity; Environmental conditions; Temperature preferences; Statistical models. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5505 |
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| Ould Mohamed Fall, K.; Inejih, C.A.O.. |
| La présente échelle macroscopique de maturité sexuelle chez les femelles de poulpe repose sur une étude histologique des ovaires. Les individus échantillonnés sont classés suivant l'échelle de maturité sexuelle de Dia et Goutschine (1990). Les caractères morphologiques externes des ovaires sont par la suite décrits avant de procéder au prélèvement d’un échantillon qui va servir à l’étude histologique. Après observation microscopique, une correspondance est établie entre la réalité microscopique et les caractères morphologiques pour l’obtention d’une nouvelle échelle. Cette nouvelle échelle à six stades que nous proposée reflète un bon état de la maturation des ovocytes dans l'ovaire. The sexual maturity scale for the females of Octopus vulgaris is... |
| Tipo: Journal Contribution |
Palavras-chave: Echelle de maturité sexuelle; Stades; Maturation; Poulpe; Octopus fisheries; Sexual maturity. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/202 |
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| Simonazzi, M.. |
| Estimations were made on the basis of a subsample of 6,734 individuals of Merluccius hubbsi from the Argentine Sea south of 41°S. Length-weight relation potential regression parameters were a=0.00950863, 0.01093448 and 0.01096117b=2.90831652, 2.86558431 and 2.86583191 for males, females and total individuals, respectively. The Newton algorithm was used to minimize the residuals. Maturity ogives were estimated with the logistic model adjusted by no lineal minimum quadratic ordinates. Length at first maturity at 50 was 33.79 cm for males and 35.38 cm for females. Age at first maturity estimated with the same model adjusted to the time elapsed from birth to catching was 2.61 and 2.67 years for males and females, respectively. Good fitting in all regressions... |
| Tipo: Journal Contribution |
Palavras-chave: Length-weight relationships; Sexual maturity; Age at recruitment; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_7016. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/2422 |
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| Fernandes,Cezar A. F.; Oliveira,Paulo G. V. de; Travassos,Paulo E. P.; Hazin,Fábio H. V.. |
| Reproductive aspects of the Brazilian snapper Lutjanus alexandrei, were characterized, including a description of the development of oocytes and spermatogenic cells, size at first sexual maturity, and fecundity. A total of 540 fish were analyzed with 250 having their gonads sectioned to allow microscopic evaluation. Six maturity stages were identified for females and males: immature, maturing, mature, spawning, spawned, and resting. Fish standard length (SL) varied from 13.0 to 28.3 cm and sex ratio was 1.6 males: 1.0 females. Monthly distributions of mean Gonadosomatic Index (GSI) and maturity stages suggest that spawning occurs mainly in a protracted period, during the warmer months, from November to March. The size of first sexual maturity was estimated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Multiple spawning; Oocytes; Sexual maturity; Spermatogenic cells. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300012 |
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| Runami,Iori; Gunji,Yousuke; Hishinuma,Mitsugu; Nagano,Masashi; Takada,Tatsuyuki; Higaki,Shogo. |
| We describe the reproductive biology of the coypu, Myocastor coypus (Molina, 1782), in western Japan, as an attempt to contribute to an efficient population control program of the coypu population. A total of 212 specimens (113 males and 99 females) were collected in the Tottori prefecture from February 2010 to January 2012. From the age estimation based on body weight and molar eruption pattern, we determined that both males and females reach sexual maturity at 4-6 months of age. Of the 72 mature females examined, 60 (83.3%) were pregnant, with a mean litter size of 6.5 ± 2.4 (mean ± SE). The onset of sexual maturity in the western Japanese population was relatively earlier when compared with indigenous and other introduced populations. Furthermore, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litter size; Pregnancy rate; Sexual maturity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200002 |
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| Lima,Giovana V.; Soares,Marcelo R. S.; Oshiro,Lídia M.Y.. |
| The aim of this work was to gain knowledge about reproductive biology of the crab Armases rubripes (Rathbun, 1897) from an estuarine area of the Sepetiba Bay. Samples were taken monthly from February 2003 to January 2004 in the Sahy River estuary (22º56'S; 44º01'W), Rio de Janeiro, Brazil. The crabs were collected by hand during 15-minute catch-effort sessions conducted by two people. In the laboratory, the specimens were separated by sex, carapace width was measured and gonadal stage was checked macroscopically. A total of 830 individuals were caught - 304 males, 373 females (60 ovigerous females) and 153 juveniles. The ovigerous females were found almost year-round, except in November and April, showing a continuous reproductive period. They presented a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crab; Sesarmidae; Fecundity; Reproduction; Sexual maturity. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212006000100007 |
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| Zarrad, R.; Cherif, M.; Gharbi, H.; Jarboui, O.; Missaoui, H.. |
| Dans ce travail, nous étudions le cycle sexuel et l’inversion sexuelle du pageot commun Pagellus erythrinus dans le golfe de Tunis. De février 2003 à janvier 2004, un total de 807 individus ont été échantillonnés mensuellement à partir des opérations de chalutage benthique. La longueur totale varie de 7,6 à 28,5 cm. L’espèce a été caractérisée par un hermaphrodisme protérogyne. Le sex-ratio (femelles / mâles) a été de 2,78. La saison de ponte s’étend d’avril à octobre et principalement de mai à juillet. Cette dernière est liée à l’élévation de la température des eaux de surface qui passe de 16 à 24°C. La première maturité sexuelle (L50) se situe chez les femelles à une longueur totale de 14,6 cm et chez les mâles à 15,8 cm. L’inversion du sexe a pris place... |
| Tipo: Journal Contribution |
Palavras-chave: Sexual maturity; Reproduction; Seabream fisheries. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4691 |
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| Vaïtilingon, D.; Rasolofonirina, R.; Jangoux, M.. |
| The reproductive cycle of the edible echinoid Tripneustes gratilla (Linneaus 1758) was investigated in a population located in the southwest coast of Madagascar (Toliara). The reproductive cycle was followed for two consecutive years (October 1999 to October 2001) and characterised by means of gonad and maturity indices. T. gratilla has an annual reproductive cycle mediated by seawater temperature, day length and feeding activity. The histology of the gonads revealed six different maturity stages grouped in three main reproductive phases: growing and maturing, spawning, and spent and recovering. Reproduction is seasonal. Growing and maturing stages occurred from late summer to early winter correlating with decreasing temperatures and day length. Spawning... |
| Tipo: Journal Contribution |
Palavras-chave: TRIPNEUSTES GRATILLA; Abiotic factors; Sexual maturity; Reproductive cycle; Temperature; Sea water; Maturity; Temperature. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1133 |
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| Registros recuperados: 93 | |
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