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Registros recuperados: 27 | |
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Ramirez Llodra, Eva; Segonzac, Michel. |
The caridean shrimp Alvinocaris niuricola has been observed forming high density populations over mussel beds on the giant pockmark cold seep site Regab in the Gulf of Guinea at 3150 m depth. Samples were collected using the ROV Victor 6000, a beam trawl and a TV grab from two sites. The specimens Were sexed and measured for population structure analysis. In one sample the sex ratio was 1:1, but the other sample had a sex ratio significantly biased towards females. The maximum size of females is larger than males. A sub-sample was used for gametogenesis and fecundity analysis. The oogenesis and spermatogenesis of A. muricola is characteristic of caridean shrimps. The oogonia proliferate from the germinal epithelium and develop into previtellogenic oocytes... |
Tipo: Text |
Palavras-chave: Reproduction biology; Oogenesis; Sex ratio; Population structure; Caridean shrimp. |
Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2317.pdf |
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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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Gardes, Lionel; Buchet, Vincent; Villanove, Philippe; Fauvel, Christian. |
Artificial insemination mastery in red drum, Sciaenops ocellatus, requires a first experimental step wOOng at getting basic biological data. Regarding males, a relation between optical density of the solution (OD) measured by spectrophotometry and sperm concentration (SC) has been established : OD O,161*SC + 0,119. Mean sperm concentration measured is 4,36.10 10 spz.mL-1. This study shows an influence of the solution of dilution on spermatozoa motility and its evolution during short term preservation. As far as females are concemed, the follow-up of final maturation through the observation of samples taken during reguIar strippings, seems to he a good technique to limit overripening and spontaneous liheration of ovules. Some artificial insemination trials... |
Tipo: Text |
Palavras-chave: Fécondation artificielle; Concentration spermatique; Motilité du sperme; Ovogenèse; Ovulation; Sur maturation; Ombrine; Sciaenops ocellatus.; Artificial insemination; Sperm concentration; Sperm motility; Oogenesis; Ovulation; Overripening; Red drum.; Sciaenops ocella/us. |
Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00366/47755/47801.pdf |
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Hojati,Vida; Keshavarz,Seyed Mohammad; Behniafar,Reza; Shiravi,Abdolhossein. |
The Caspian Green Lizard, Lacerta strigata Eichwald, 1831, is a member of the Lacertidae family distributed in the Caspian coast of northern Iran. The specimens were found in coastal dunes, hilly areas and pastureland containing some shrubby cover. In this research, the reproductive biology of this species was studied from April 20 to September 5, 2013. Forty eight adult specimens including 24 females and 24 males were collected by hand at midday from three sampling stations (Goharbaran, Ab-Bandansar and Ab-Bandankesh) of Sari County, located in Mazandaran Province of Iran. Ovaries and testes were removed and processed for histological and morphometric studies. In females, there were 617 follicles in each ovary. Totally, 610 oviductal eggs were observed... |
Tipo: Journal article |
Palavras-chave: Lacertidae; Caspian green lizard; Oogenesis; Spermatogenesis; Caspian coast. |
Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200005 |
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Cassel,Mônica; Mehanna,Mahmoud; Mateus,Lúcia; Ferreira,Adelina. |
The comprehension of the reproductive cycle allows to understand which are the morphological changes that develop in the gonad during this interval. Thus, many studies have been undertaken in order to describe and classify the stages of gonadal development and reproductive status of Neotropical fishes. For this purpose, specimens of Melanorivulusaff. punctatus were collected in a permanent dam in Chapada dos Guimarães, Mato Grosso, Brazil. The gonads were prepared for analysis by light microscopy. The oogenesis and spermatogenesis have been described, characterizing the stages of gonadal development, together with assessments of the gonadosomatic ratio, germ cell count and verification of variation of mature oocytes in females. Throughout the year the male... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gonadossomatic ratio; Histology; Oogenesis; Spermatogenesis. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000100179 |
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Branco,Ilka S. L.; Viana,Danielle L.; Félix,Renata T. S.; Véras,Dráusio P.; Hazin,Fábio H. V.. |
The oogenesis is a key stage in the reproductive development of an organism, which can be best understood from histological analysis of ovaries in different maturity stages. In order to provide information on the reproductive biology of the black triggerfish, M. niger, in particular on its oogenesis process, this study aimed at identifying and characterizing the oocyte development stages and its organization within the different stages of ovarian maturation based on specimens from São Pedro e São Paulo Archipelago. In this present report, a number of 294 ovaries were histologically analyzed. It was verified that they are composed of ovigerous lamellae containing oocytes at different development stages. Five different stages of oogenesis were identified:... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Histology; Oogenesis; Reef fish; Reproduction; Vitellogenesis. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300597 |
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Missaoui, H.; Toujani, R.; Romdhane, M.S.. |
Durant la période mars 1996 - mars 1997, nous avons suivi sur un échantillon de 720 individus, l’état de la maturité sexuelle des femelles de sandre Stizostedion lucioperca peuplant la retenue du barrage de Sidi Salem (nord de la Tunisie). Parallèlement, une étude basée sur des coupes histologiques a été réalisée sur un échantillon de 65 femelles (taille moyenne = 35 cm, poids moyen = 522 g et âge moyen = 1,8 ans). Ces travaux ont permis de montrer que: - l’âge de la première maturité sexuelle des femelles est d'un an pour une taille de 24 cm et un poids de 90 g. - la fécondité relative est de 200 œufs / g de poids corporel et la fécondité absolue F est fortement corrélée avec le poids W (F=632 *W 0,77), la taille L (F=6760*L 148372) et l'âge t... |
Tipo: Journal Contribution |
Palavras-chave: Spawning; Fecundity; Freshwater fish; Oogenesis; Sexual maturity. |
Ano: 2010 |
URL: http://hdl.handle.net/1834/4288 |
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Navarro,Fernanda Keley Silva Pereira; Navarro,Rodrigo Diana; Murgas,Luis David Solis; Pereira,Marina Apocalypse Nogueira; Hundley,Guilherme Crispim. |
The objective of this work was to evaluate the effect of photoperiod on luteinizing hormone (LH) plasma levels and gonadal maturation of lambari females. One hundred and twenty adult lambaris, distributed into 12 aquaria of 20 L each, were randomly subjected to three different treatments, in a completely randomized design, and four replicates. Treatments were photoperiods in hours of light (L) and darkness (D): T1, 0 L:24 D; T2, 12 L:12 D; T3, 24 L:0 D. After 40 days, fish were subjected to fasting for 24 hours and, then, anesthetized. Immediately after slaughter, fish were weighed, and their gonads and livers were removed and weighed. Ovaries were weighed and immersed in Bouin's fixative solution for 24 hours and, then, kept in 70% alcohol until... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax bimaculatus; Native species; Gonadosomatic index; Hepatosomatic index; Oogenesis. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000800039 |
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Oliveira,Elton C. de; Fávaro,Luís Fernando. |
The present study characterizes the oogenesis and the ovarian maturation scale, and determines the reproductive period, type of spawning, recruitment period, and population variations in the reproductive process of the flatfish Achirus lineatus (Linnaeus, 1758). Specimens were sampled on a monthly basis in the shallow near shore area of the Paranaguá Bay, state of Paraná, Brazil, from March 2006 to February 2007. The specimens collected were measured for morphometric data (total length and total weight) and their gonads were exposed for macroscopic evaluation. The gonads were subsequently removed, weighed and processed for microscopic analyses. Six phases of the ovarian follicle development were defined, as well as five ovarian development stages. Growth... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oogenesis; Maturity scale; Reproductive period; Type of spawning; Sex ratio. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000400004 |
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Garcia,José Antônio Dias; Chini,Helena A.S.; Maistro,Edson Luis; Quagio-Grassiotto,Irani. |
Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stained cytoplasm with eosinophilic granules. The primary oocytes showed a large basophilic nucleus, with a developed peripheral nucleolus and a reduced cytoplasm. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teleostei; Characidae; Astyanax fasciatus; Oogenesis; Cytochemical. |
Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400003 |
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Chini,Helena A.S.; Garcia,José Antônio Dias; Maistro,Edson Luis; Quagio-Grassiotto,Irani. |
Oogenesis involves a sequense of transformations which are undergone by female germ cells. These cells change into oogonias and then into mature oocytes. Sexually mature females were collected monthly, during one year, from the Rio Sapucaí, tributary of the Rio Grande, which is part of the Furnas Reservoir system in the state of Minas Gerais. The observed material showed that oogonias were small spherical cells, had a big spherical nucleus, with a single nucleolus, and weakly stained cytoplasm with eosinophilic granules (FG stained), which indicate their protein content. The primary oocytes showed a big basophilic nucleus, with a large peripheral nucleolus, and several smaller nucleoli. They show a reduced cytoplasmic content. The previtellogenic oocytes... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teleostei; Anostomidae; Leporinus striatus; Oogenesis; Cytochemical. |
Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400004 |
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Barros,Marcelo D. M.; Guimarães-Cruz,Rodrigo J.; Veloso-Júnior,Vanderlei C.; Santos,José E. dos. |
The gonad morphology and gametogenesis of Lophiosilurus alexandri Steindachner, 1877 from Santo Antônio river (Minas Gerais, Brazil) were studied through anatomical and histological techniques. Examination of the testis revealed that they were paired, fringed organs with two distinct regions: cranial spermatogenic and caudal spermatogenic and secretory. The cranial region represents ca. 60% of the mature/maturing testis, containing 41 to 73 fringes, while the caudal portion represents ca. 40% and contains 44 to 68 fringes. At the cranial portion the length of the fringes was 3.70 ± 1.70 mm and in the caudal portion was 0.20 ± 0.10 mm. The spermatogenesis was cystic, synchronic, and occurred throughout the whole extension of the seminiferous tubules. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gonads; Morphology; Oogenesis; Pseudopimelodidae; Spermatogenesis. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000100028 |
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Gastón FIAD,Federico; CAREZZANO,Fernando José; CARDOZO,Miriam; RODRÍGUEZ,Claudia Susana. |
ABSTRACT Triatoma infestans and Triatoma platensis are interfertile species that frequently share ecotopes and produce natural fertile hybrids. Interspecific crossing allows the production of more suitable hybrid genotypes capable of colonizing new habitats. Therefore, studies of reproductive aspects in hybrids are of great importance. In this sense, oogenesis, a process that involves the development of the oocyte and allows the formation of viable eggs, is a relevant aspect. In this study, histological aspects focused on the follicular development of experimental hybrids were characterized. To do this, the ovaries of35 hybrid females were removed, paraffin-embedded and stained with hematoxylin-eosin. The development of the follicular epithelium and the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oogenesis; Ovarian cycle; Reproductive biology; Triatominae. |
Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2021000300462 |
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Registros recuperados: 27 | |
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