|
|
|
| Registros recuperados: 16 | |
|
|
| Vono,Volney; Silva,Luiz Gustavo M.; Maia,Bruno P.; Godinho,Hugo P.. |
| The reproductive activity parameters of the teleosts Pimelodus maculatus Lacépède, 1803, Leporinus amblyrhynchus Garavello & Britski, 1987 and Schizodon nasutus Kner, 1859 was evaluated at a newly formed reservoir in the Araguari River, Paraná River basin, Southeast Brazil. The fishes were captured by gill nets bimonthly from November 1997 to November 1998 at three sampling stations. The stages of gonad development were identified macroscopically in the field and then confirmed by histological analysis in the laboratory. The females of all species reached larger standard length than the males. Pimelodus maculatus in reproductive activity were captured only in November, 1997 and January, 1998 whereas L. amblyrhynchus and S. nasutus were in activity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish reproduction; Reservoir; Dam effects. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000300020 |
| |
|
|
| 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 |
| |
|
|
| Hilbig, Cleonice Cristina; UNIOESTE; Bombardelli, Robie Allan; UNOESTE; Sanches, Eduardo Antônio; UNESP; Oliveira, José Dílson Silva de; UNIOESTE; Baggio, Diego Mendes; UNIOESTE; Souza, Bruno Estevão de; UNIOESTE. |
| A poluição no meio aquático afeta o potencial reprodutivo de várias espécies de peixes. Diante disso, o presente experimento foi conduzido com o objetivo de avaliar os efeitos causados pela contaminação da água utilizada no processo de fertilização artificial e incubação inicial de ovos de jundiá cinza (Rhamdia quelen) por chumbo. Foram realizados dois ensaios, os quais foram distribuídos em delineamento experimental inteiramente casualizado, compostos por seis tratamentos, com quatro e seis repetições, para o primeiro e o segundo ensaio, respectivamente. O primeiro ensaio consistiu na contaminação da água utilizada no processo de fertilização artificial, com os níveis de 0,00; 0,01; 0,02; 0,03; 0,04 e 0,05 mg de Pb.L-1, e incubação dos ovos em água limpa.... |
|
Palavras-chave: 5.04.05.00-4 Produção Animal fertilização artificial; Jundiá cinza; Metal pesado; Reprodução de peixes; Rhamdia quelen. artificial fertilization; Gray jundiá; Heavy metal; Fish reproduction; Rhamdia quelen. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4703 |
| |
|
| |
|
|
| Daga,Vanessa Salete; Gogola,Tatiane Mary; Sanches,Paulo Vanderlei; Baumgartner,Gilmar; Baumgartner,Dirceu; Piana,Pitágoras Augusto; Gubiani,Éder André; Delariva,Rosilene Luciana. |
| The objective of this study was to assess the abundance, attributes of assemblages, and spatial and temporal distributions of fish larvae and their relationships with some abiotic variables in two floodplain lakes with different degrees of connection to the Paraná River in Ilha Grande National Park, PR, Brazil. Four sampling sites were chosen, two in each floodplain lake. Night samples were taken with plankton nets during three spawning seasons (monthly, from October to March) from 2001 to 2005. The highest diversity and abundance were recorded at Saraiva Lake, with 25 taxa being identified. In Xambrê Lake, only sedentary species were captured, and the most abundant species were Plagioscion squamosissimus and Hypophthalmus edentatus. The greatest abundance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ichthyoplankton; Fish reproduction; Parque Nacional de Ilha Grande; Upper Paraná River. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300010 |
| |
|
| |
|
|
| Holzbach,Arlei J.; Gubiani,Éder A.; Baumgartner,Gilmar. |
| The purpose of this study was to analyze the population structure (spatial and temporal distribution, sex ratio, length distribution and length/weight relationship) and reproductive biology of Iheringichthys labrosus. This species is of importance as fisheries resource in the Paraná River basin. Fish were sampled, bimonthly, with gill and trammel nets at three sampling sites (Campina, Apertado and Altônia), located in the Piquiri River, between November 2002 and September 2003. In this study, 164 individuals were collected; the largest capture occurred in Campina site, with 209.88 individuals/1000 m² of net for 24 hours, while the shift of largest capture was night time (N) and the month was July. Females occurred in larger numbers than males in all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish reproduction; Population dynamics; Upper Paraná River; Tributary. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000100008 |
| |
|
|
| Chaves,Paulo de Tarso C; Vendel,Ana Lúcia. |
| The species of Citharichthys Bleeker, 1862, C. arenaceus Evermann & Marsh, 1900 and C. spilopterus Günther, 1862, are the most common flatfishes found in Guaratuba Bay, south Brazil. Different size categories of these flatfish occur in the mangrove area throughout the year. The Gonadosomatic Index, the Condition Factor, and the morphological analyses of the gonads from samples obtained between 1994 and 1996 reveals a spawning activity during late Spring and early Summer. This period coincides with the increase in temperature and decrease in salinity. Spawning evidence and the presence of ali size categories throughout the year indicate that Citharichthys spp. are permanent inhabitants of the mangrove in Guaratuba Bay, where they complete their life... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teleostei; Pleuronectiformes; Fish reproduction; Guaratuba Bay; Brazil. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100007 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Duarte,Silvana; Araújo,Francisco Gerson; Bazzoli,Nilo. |
| In this work we describe the gonad morphology and spawning season of Hypostomus affinis (Steindachner, 1877) in a tropical reservoir based on 55 males and 125 females. Our aim was to assess eventual adaptations in reproductive tactics developed by this riverine species inhabiting an oligotrophic reservoir with low habitat complexity, few rocks and few other preferred consolidated substrata. We described the stages of cells of reproductive lineage, gonadal development and some reproductive traits which were compared with information in the available literature. Cells from the spermatogenic lineage were spermatogonia, spermatocytes, spermatids and spermatozoa, and cells from the oocytarian lineage were primary oocytes, previtelogenic oocytes, cortical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Fish reproduction; Reproductive biology; Reservoirs; Tactics. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500005 |
| |
|
|
| Lopes,Taís da Silva; Sanches,Eduardo Antônio; Caneppele,Danilo; Romagosa,Elizabeth. |
| ABSTRACT: To know the non-toxic cryoprotectants to fish oocytes is of extreme importance for tests that aim to increase oocyte resistance to cold, thus allowing more advanced studies in cryopreservation. Therefore, commonly used cryoprotectants such as methanol, dimethyl sulfoxide, ethylene glycol, propylene glycol, sucrose and fructose were studied. Immature oocytes from the initial to vitelogenic (diameter <1.7 mm) and mature (diameter >1.8 mm) stages of Steindachneridion parahybae were evaluated. Four distinct experiments were performed, three using immature oocytes and one using oocytes at the mature stage. For each oocyte stage, the best maintenance solution to be used: Hank or 50% L15 and; viability after baths for 30min (room temperature) at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish reproduction; Fish oocytes; Toxicity; Concentrations of cryoprotecntants; Steindachneridion parahybae. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600650 |
| |
|
|
| Desvignes, Thomas; Nguyen, Thaovi; Chesnel, Franck; Bouleau, Aurelien; Fauvel, Christian; Bobe, Julien. |
| Retinitis pigmentosa 2 (RP2) gene is responsible for up to 20% of X-linked retinitis pigmentosa, a severe heterogeneous genetic disorder resulting in progressive retinal degeneration in humans. In vertebrates, several bodies of evidence have clearly established the role of Rp2 protein in cilia genesis and/or function. Unexpectedly, some observations in zebrafish have suggested the oocyte-predominant expression of the rp2 gene, a typical feature of maternal-effect genes. In the present study, we investigate the maternal inheritance of rp2 gene products in zebrafish eggs in order to address whether rp2 could be a novel maternal-effect gene required for normal development. Although both rp2 mRNA and corresponding protein are expressed during oogenesis, rp2... |
| Tipo: Text |
Palavras-chave: Developmental biology; Egg developmental competence; Egg quality; Fish; Fish reproduction; Maternal-effect gene; Ndpk; Nme10; Oocyte; Oocyte-specific; Ovum; Teleost; Zygote. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00280/39099/37660.pdf |
| |
| Registros recuperados: 16 | |
|
|
|
