Consulta: subjectFacets:"Gonads"
Registros recuperados: 17
Data/hora: 01/06/2024 06:25:32

Содержание Zn, Cu, Pb, Cd в гонадах культивируемых Mytilus galloproincialis Lam.
Provedor de dados: 13
Autores: Челядина, Н. С.; Вялова, О. Ю.; Смирнова, Л. Л.
Показана сезонная изменчивость содержания Zn, Cu, Cd, Pb в гонадах самцов и самок. Концентрация РЬ увеличивалась с ростом массы генеративной ткани моллюска, вариабельность этого показателя выше у сам­цов. Медь в генеративной ткани самок содержалась в меньшем количестве, по сравнению с самцами, но её концентрирование стабильно на всех изучаемых стадиях гаметогенеза. Выявлены положительная корреляция между содержанием цинка и кадмия и отрицательная между содержанием цинка и свинца в гонадах мидий.
Tipo: Journal Contribution
Palavras-chave: Тяжёлые металлы; Вариабельность; Мидия; Гонады; Heavy metal; Variability; Mussel; Gonads; Black Sea Heavy metals Variability Gonads Heavy metals Gonads http://aims.fao.org/aos/agrovoc/c_2223 http://aims.fao.org/aos/agrovoc/c_34291.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/238

Reproductive aspects of Dendropsophus sanborni (Anura, Hylidae) in northeastern Argentina
Provedor de dados: 76
Autores: Curi,Lucila M.; Olea,Gabriela. B.; Álvarez,Blanca B.; Céspedez,Jorge A.; Lombardo,Daniel M.
Reproductive aspects of Dendropsophus sanborni (Anura, Hylidae) in northeastern Argentina. The aim of this investigation was to characterize reproductive aspects of Dendropsophus sanborni (Schmidt, 1944) (Anura, Hylidae) in the northwest of Corrientes province, in northeastern Argentina. The reproductive cycles of males and females, the existence of sexual dimorphism and the male’s vocalization period were analyzed. Samplings were made from September 2011 to August 2012. Dendropsophus sanborni showed a prolonged reproductive pattern because reproductive activity was observed during most part of the year. Calling males were recorded all months except in July. The spermatogenic cycle can be characterized as potentially continuous. In males, snout-vent length...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproduction; Vocalizations; Gonads.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000400007

A shortcut method for sexing juvenile European sea bass, Dicentrarchus labrax L.
Provedor de dados: 5
Autores: Menu, Bruno; Peruzzi, Stefano; Vergnet, Alain; Vidal, Marie-odile; Chatain, Beatrice.
The objective of this study was to develop a rapid and effective method of sexing juvenile sea bass with minimum labour and material. To this end, the gonad squash mount technique was applied along with macroscopic techniques for sexing a large number of experimental fish at the age of 215-275 days post fertilization (p.f.). At this age, 90% of the 3894 fish could be unambiguously sexed by macroscopic examination of their gonads, whereas the remaining proportion was identified using squash mount preparations (10%). The accuracy of the observations was measured up to classical histology procedures. Undifferentiated fish accounted for 0.1% of the total population only. The application of the squash mount technique holds out the prospect of considerable...
Tipo: Text
Palavras-chave: Histology; Squash; Juvenile; Gonads; Seabass; Dicentrarchus labrax.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-378.pdf

Climate change impacts on fish reproduction are mediated at multiple levels of the brain-pituitary-gonad axis
Provedor de dados: 5
Autores: Servili, Arianna; Canario, Adelino V.m.; Mouchel, Olivier; Muñoz-cueto, José Antonio.
Anthropogenic emissions of carbon dioxide in the atmosphere have generated rapid variations in atmospheric composition which drives major climate changes. Climate change related effects include changes in physico-chemical proprieties of sea and freshwater, such as variations in water temperature, salinity, pH/PCO2 and oxygen content, which can impact fish critical physiological functions including reproduction. In this context, the main aim of the present review is to discuss how climate change related effects (variation in water temperature and salinity, increases in duration and frequency of hypoxia events, water acidification) would impact reproduction by affecting the neuroendocrine axis (brain-pituitary-gonad axis). Variations in temperature and...
Tipo: Text
Palavras-chave: Climate change; Fish reproduction; Gonads; Neuroendocrine regulation; Environmental control; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00609/72079/70796.pdf

La Reproduction naturelle et contrôlée des bivalves cultivés en France. -Rapport de Groupe de Travail- IFREMER/Nantes/France, 14 et 15 novembre 1995
Provedor de dados: 5
Autores: Devauchelle, Nicole; Barret, Jean; Salaun, Gilles.
This report compiles 17 short and illustrated syntheses concerning the natural strategies of reproduction and the artificial control of the reproductive process for the flat oyster, Ostrea edulis, the japanese oyster, Crassostrea gigas, the mussels, Mytilus edulis and My ti/us galloprovincialis, the scallop, Pecten maximus. An additional syntheses is presented, as a comparison within molluscs, which are the main research topics at IFREMER concerning the artificial control of the reproductive processes in Marine Fish. Three main subjects are documented :  1. the ecophysiology of the natural period of reproduction in the wild,  2. the methods developed in the hatcheries for the artificial control of the reproductive periods, the gametes collection and the...
Tipo: Text
Palavras-chave: Bivalves; Stratégie de reproduction; Contrôle artificiel; Gonades; Gamètes; Coquille St Jacques; Moules; Huîtres; Nourriture; Photopériode; Température; Biologie; Physiologie; Biochimie.; Bivalves; Reproductive strategy; Artificial induction of reproduction; Gonads; Gametes; Scallop; Mussels; Oysters; Food; Light; Temperature; Biology; Physiology; Biochemistry.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00043/15441/12811.pdf

Morphological Diversity of the Ovaries of the Mexican Teleost Fishes
Provedor de dados: 77
Autores: Kobelkowsky,Abraham.
The morphological diversity of the ovaries from a total of 90 species of teleosts in the Mexican fauna was analyzed. Ovaries were classified according to the following characters: their number, symmetry, fusion grade, trajectory, cross section, and topographical location. The fusion of both left and right ovaries was the character showing most diversity, mainly in the Cyprinodontiformes and its tendency to the viviparity. However, the most notably character was the extravisceral development of the ovaries in the Pleuronectiformes, implying the forward orientation of the gonoduct and the forward position of the female genital opening. The urogenital system of a typical perciform, Bairdiella chrysoura is proposed as a morphological pattern of the Teleostei.
Tipo: Journal article
Palavras-chave: Osteichthyes; Genital system; Gonads; Anatomy.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400017

Histological Validation of Morphochromatically-Defined Gonadal Maturation Stages of Green Abalone (Haliotis fulgens) Philippi,1845 and Pink Abalone (Haliotis corrugata) Wood, 1828
Provedor de dados: 77
Autores: Vélez-Arellano,Nurenskaya; García-Domínguez,Federico Andrés; Lluch-Cota,Daniel B; Gutiérrez-González,José L; Sánchez-Cárdenas,Rebeca.
Identifying the maturity stage of specimens is essential for the determination of the spawning season, which in turn facilitates the formulation of adequate fisheries management measures for the sustainable use of sea resources, such as abalone. This study aims to validate, based on histological evidence, a gonad maturation scale that encompasses four morphochromatically-defined stages (developing, maturity, spawning and resting) for females and males, plus an additional stage for reproductively inactive (undifferentiated) specimens, to be used as an identification key. Given the similarity between Haliotis fulgens and Haliotis corrugata as to their morphochromatic features, the gonadal maturation scale can be used for both species.
Tipo: Journal article
Palavras-chave: Assessment tools; Gametogenesis; Gonads; Reproduction.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300039

Echelle de Maturité sexuelle du poulpe (Octopus vulgaris, Cuvier 1797) des eaux mauritaniennes
Provedor de dados: 20
Autores: Goutschine, A.; Dia, M.A.
Résumé : Après une sommaire description de l’appareil reproducteur (mâle et femelle), une échelle de maturité sexuelle du poulpe (Octopus vulgaris) a été définie. Elle est uniquement basée sur une observation macroscopique du développement des gonades et des organes annexes, au cours du cycle sexuel.
Tipo: Journal Contribution
Palavras-chave: Mauritania; Cycle sexuel; Gonades; Octopus; Octopus vulagaris; Maturity scale; Mauritanie; Echelle de maturité; Gonads; Sexual cycle; Poulpe; Octopus fisheries.
Ano: 1990
URL: http://hdl.handle.net/1834/785

Gonocorismo en la vieira patagonica Zygochlamys patagonica (King y Broderip, 1832) en el Banco Reclutas, Argentina
Provedor de dados: 20
Autores: Campodónico, S.; Macchi, G.J.; Lasta, M.L.
Different cases of hermaphroditism in Zygochlamys patagonica were described through histological analysis. Samples were collected in Reclutas Bed. Argentine Sea, SW Atlantic. The hermaphroditism incidence was 0.14. . Thus, the protandric hermaphroditism hypothesis previously suggested by some autors was discarded.
Tipo: Journal Contribution
Palavras-chave: Gonads; Histology; Hermaphroditism; Protandry; Hermaphroditism; Gonads; Http://aims.fao.org/aos/agrovoc/c_3571; Http://aims.fao.org/aos/agrovoc/c_34291.
Ano: 2004
URL: http://hdl.handle.net/1834/1502

Inducción del desove, desarrollo embrionario y larval de Chaetodipterus faber (Broussonet) (Pisces, Ephippidae) en la Isla Margarita, Venezuela
Provedor de dados: 20
Autores: Gómez-Gaspar, A.
La paguara Chaetodipterus faber (Broussonet, 1782) tiene cierta importancia económica en países del Caribe sur. En la Isla Margarita (Venezuela) se colectaron juveniles que fueron mantenidos en jaulas flotantes donde lograron el desarrollo de sus gónadas.  Se seleccionaron adultos y en el laboratorio se indujo la puesta mediante inyecciones de hormonas gonadotropas. Los huevos son flotantes y de forma esférica, su diámetro varía entre 0.9 y 1.1 mm y la gota de aceite tiene 0.25 a 0.35 mm de diámetro. A las 26 horas de la fertilización eclosionaron los huevos incubados a temperatura entre 24.5-28.4°C. Las larvas recién nacidas miden de 1.9a 2.1 mm; el saco vitelino tiene una longitud entre l.1 y l.3 mm y  se reabsorbe a los dos o tres días. La fase larval...
Tipo: Journal Contribution
Palavras-chave: Fish; Fish eggs; Gonads; Larval development; Embryonic development; Fish; Embryonic development; Gonads; Http://aims.fao.org/aos/agrovoc/c_15903; Http://aims.fao.org/aos/agrovoc/c_2545; Http://aims.fao.org/aos/agrovoc/c_34291.
Ano: 1984
URL: http://hdl.handle.net/1834/4034

Testicular and spermatozoal characteristics of channel catfish, &lt;i&gt;Ictalurus punctatus&lt;/i&gt;, outside the spawning season
Provedor de dados: 27
Autores: Jaspers, E.; Avault, J.W. Jr.; Roussel, J.D.
Several testicular and spermatological parameters of 48 male channel catfish, &lt;i&gt;Ictalurus punctatus&lt;/i&gt; (Rafinesque) were studied during 6 months (November through April) outside the spawning season. Two stocks (a domestic and a wild one) and within each stock 2- and 3-year-old fish were compared. Within age-groups, the domestic fish were considerably larger than the wild ones. In each stock, the 3-year-olds outgrew the 2-year-olds. The testes consisted of a white spermatogenic and pink glandular part, averaging 1.14 and 0.56 g respectively. A significant increase in both parts was noticed in March, continuing during April. One 3-year-old male in each stock was azoospermic, even though these fish had well developed testes and exhibited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonads; Spawning seasons; Ictalurus punctatus.
Ano: 1978
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3585

Anatomia visceral comparada de seis espécies de Amphisbaenidae (Squamata: Amphisbaenia)
Provedor de dados: 103
Autores: Navega-Gonçalves,Maria Eliana C.
Visceral anatomy of amphisbaenids Amphisbaena vermicularis Wagler, 1824; Anops kingii Bell, 1833; Aulura anomala Barbour, 1914; Bronia bedai Vanzolini, 1991; Cercolophia cuiabana Strüssmann &amp;amp; Carvalho, 2001, and Leposternon microcephalum Wagler, 1824 were comparatively described and the size and the position of the organs in the pleuroperitoneal cavity was established in relation to the ventral scutellation. The main results were: the right lung presents different degrees of size reduction compared to the left lung, being conspicuous only in A. anomala, and L. microcephalum; the limit between small and large intestines is clear due to the presence of a caecum; the right lobe of the liver is larger than the left one, but its length varies within the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alimentary tract; Amphisbaenians; Gonads; Kidneys; Lungs.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300015

Reproductive biology of Moenkhausia intermedia (Eigenmann) (Pisces, Characiformes) in Itumbiara Reservoir, Goiás, Brazil
Provedor de dados: 104
Autores: Hojo,Renê Eiji Souza; Santos,Gilmar Bastos; Bazzoli,Nilo.
To study the reproductive biology of Moenkhausia intermedia (Eigenmann, 1908) in Itumbiara reservoir, Paranaíba river, Goiás, Brazil, a total of 301 specimens (237 females and 64 males) were captured quaterly from January to December 1993. The gonadosomatic index of females and males were related to morphologic variations of the gonads in different reproductive cycle stages (RCS). Analysis of RCS frequency and variations in the gonadosomatic index showed that M. intermedia reproduces during the whole year with fractional spawning. The smallest standard length at advanced maturity stage was estimated as 6.6 cm for females and 6.0 cm for males. The stomach repletion and coelomic fat indexes of both sexes reached peak values in the rest stage, suggesting that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonads; Reproduction; Sexual dimorphism; Sexual maturation; Spawning.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000300015

Descrição histológica de gônadas de traíra Hoplias malabaricus (Bloch) (Osteichthyes, Erythrinidae) da barragem do rio Gramame, Alhandra, Paraíba, Brasil
Provedor de dados: 104
Autores: Marques,Débora K.S.; Rosa,Ierecê de Lucena; Gurgel,Hélio de Castro B.
The reproductive cycle of Hoplias malabaricus Bloch, 1794, was studied through histological preparations, based on 102 specimens collected in the Gramame reservoir, Paraiba State, from August 1993 to July 1994. Seven developmental stages were identified for the feminine gametes and five for the masculine gametes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hoplias malabaricus; Gramame reservoir; Histology; Gonads.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300002

Reproductive apparatus and gametogenesis of Lophiosilurus alexandri Steindachner (Pisces, Teleostei, Siluriformes)
Provedor de dados: 104
Autores: 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

Supplementation with microencapsulated lemongrass essential oil improves protein deposition and carcass yield in silver catfish (Rhamdia quelen)
Provedor de dados: 2
Autores: Rampelotto, Cristine; Lima, Joziane Soares de; Pinheiro, Carlos Garrido; Salbego, Joseânia; Silva, Leila Picolli da; Emanuelli, Tatiana.
The aim of this study was to investigate the effect of dietary supplementation with Cymbopogon flexuosus essential oil (EO) on productive performance, metabolic parameters and body and fillet composition of adult silver catfish, Rhamdia quelen. Total length, condition factor, weight gain, specific growth rate, hepatosomatic index, visceral fat content and fillet composition were not affected by EO supplementation. Plasma total protein, globulin and triglycerides were reduced by EO supplementation. Supplementation with 1 mL EO kg-1 diet increased carcass yield and protein deposition in the carcass, while reducing gonadosomatic index and fat deposition in the carcass when compared to control group. In addition, 1 mL EO kg-1 diet also improved feed intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zootecnia/Nutrição e alimentação animal Cymbopogon flexuosus; Citral; Growth performance; Gonads; Body composition.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/36517

Reproductive ability of pubertal male and female rats
Provedor de dados: 56
Autores: Zemunik,T.; Peruzovic,M.; Capkun,V.; Zekan,L.; Tomic,S.; Milkovic,K.
Ten Fisher rats 50 to 55 days of age made up the pubertal group, and ten rats 90 to 95 days of age served as the controls. The testicular and epididymal weights and volumes of the pubertal males were lower than those of the controls (P&lt;0.001). There was also a difference in relative epididymal weight (P&lt;0.001). The sperm of pubertal males was morphologically abnormal in 58.2% of cases, as opposed to only 3.8% in the controls (P&lt;0.001). The mean number of spermatozoa in the control group was 11.9 × 10(6)/ml and their viability was 99.6%, while these values could not be determined for pubertal rats. Serum testosterone was higher in the pubertal animals than in the controls (2.52 ± 1.46 vs 0.92 ± 0.34 nM, P&lt;0.01). The ovaries of control females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Puberty; Reproduction; Gonads; Sex hormones; Pregnancy.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700007