Consulta: subjectFacets:"Fish reproduction"
Registros recuperados: 16
Data/hora: 10/06/2024 00:31:19

X-Linked Retinitis Pigmentosa 2 Is a Novel Maternal-Effect Gene Required for Left-Right Asymmetry in Zebrafish
Provedor de dados: 5
Autores: 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

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

Morphology of the urogenital papilla and its component ducts in Astyanax altiparanae Garutti &amp;amp; Britski, 2000 (Characiformes: Characidae)
Provedor de dados: 83
Autores: Siqueira-Silva,Diógenes Henrique de; Silva,Amanda Pereira dos Santos; Ninhaus-Silveira,Alexandre; Veríssimo-Silveira,Rosicleire.
The histological description of the urogenital papilla is an important tool to comprehension of the reproductive mechanisms in fish, as well as a pre-requisite to germ cell transplantation in adult fish, besides to be a good biological indicator to environmental changes. Was performed the histological description of the urogenital papilla and its component ducts in the tetra Astyanax altiparanae. The genital and urinay ducts pass separately throughout most part of its extension, joining in a single duct before opening. In males this opening is asymmetric and seems to have double origin, being completely surrounded by striated muscle fibers, while in females it is symmetric and the muscle fibers does not surround it totally. Spermatic duct and oviduct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish reproduction; Histological analysis; Oviduct; Sperm duct; Urinary duct.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200309

Iheringichthys labrosus (Siluriformes: Pimelodidae) in the Piquiri River, Paraná, Brazil: population structure and some aspects of its reproductive biology
Provedor de dados: 83
Autores: 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

Fish larvae assemblages in two floodplain lakes with different degrees of connection to the Paraná River, Brazil
Provedor de dados: 83
Autores: 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

Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
Provedor de dados: 83
Autores: Freitas,Tiago Magalhães da Silva; Almeida,Vitor Hudson da Consolação; Montag,Luciano Fogaça de Assis; Fontoura,Nelson Ferreira.
ABSTRACT Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L  50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G  SI ). L  50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L  50 estimates increased to 13.05 cm for males and 13.7 cm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Auchenipteridae; Fish reproduction; Growth pattern; Sexual maturity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000400203

Egg surface structure of the freshwater toadfish Thalassophryne amazonica (Teleostei: Batrachoididae) with information on its distribution and natural habitat
Provedor de dados: 83
Autores: Britz,Ralf; Toledo-Piza,Mônica.
The egg surface structure of Thalassophryne amazonica, a freshwater toadfish from the Amazon basin is described. Eggs of this species show a remarkable, highly unusual system of parallel ridges and intermittent grooves that originate at the equator of the egg and lead to the micropylar pit, at which they end in a spiralling pattern. A similar egg surface structure has so far been described only from a group of Asian anabantoid percomorphs, obviously not closely related to Thalassophryne. This egg surface pattern may enhance fertilization success by guiding sperm to the micropyle. We review museum records for T. amazonica, present an updated map of its occurrence in the Amazon basin, and provide information on its habitat.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg attachment; Fish reproduction; Micropylar apparatus; Upper Amazon; Zona radiata.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300013

Reproductive plasticity of Hypostomus affinis (Siluriformes: Loricariidae) as a mechanism to adapt to a reservoir with poor habitat complexity
Provedor de dados: 103
Autores: 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

Reprodução de Stellifer rastrifer (Jordan) (Teleostei, Sciaenidae) na Baía de Guaratuba, Paraná, Brasil
Provedor de dados: 104
Autores: Chaves,Paulo de Tarso da Cunha; Vendel,Ana Lúcia.
A total of 1312 individuais of S. rastrifer were sampled from March 1994 to September 1996 at the Guaratuba Bay, Southern Brazilian coast. This species is a permanently inhabitant of the mangrove area throughout the year. The weight/length relationship of the species in the region is "In TW =-12,35 + 3,22 In TL", and the individuais may reach 172mm of total length. The analyses of gonadal morphology and gonadossomatic index indicate that S. rastrifer is a multiple spawner species, that reproduces at the mangrove area during a long period of the year. The reproductive activity is more intense during the winter and mainly the spring, when the value of Condition Factor declines and empty folheies are found in the ovaries.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Sciaenidae; Stellifer rastrifer; Fish reproduction; Guaratuba Bay; Brazil.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100008

Biologia reprodutiva de três espécies simpátricas de peixes neotropicais: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus Garavello &amp;amp; Britski e Schizodon nasutus Kner (Characiformes, Anostomidae) do recém-formado Reservatório de Miranda, Alto Paraná
Provedor de dados: 104
Autores: 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 &amp;amp; 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

Indicadores reprodutivos das espécies de Citharichthys Bleeker (Teleostei, Pleuronectiformes) na Baía de Guaratuba, Paraná, Brasil
Provedor de dados: 104
Autores: Chaves,Paulo de Tarso C; Vendel,Ana Lúcia.
The species of Citharichthys Bleeker, 1862, C. arenaceus Evermann &amp;amp; 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

Efeito do chumbo sobre a fertilização artificial e incubação de ovos de jundiá cinza (Rhamdia quelen) - DOI: 10.4025/actascianimsci.v30i2.4703
Provedor de dados: 2
Autores: 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

Histological characterization of oocyte developmental stages of suruvi Steindachneridion scriptum  kept in captivity
Provedor de dados: 2
Autores: Abreu, Mariana Roza; Garcia, Patrícia; Zaniboni-Filho, Evoy.
Stages of oocyte development were described for suruvi females (Steindachneridion scriptum) kept in captivity. Oocytes of 21 mature or maturing females and ovaries of 12 immature females were fixed in Karnovsky solution for 4 and 12 hours, respectively. After, they were processed for routine histology, embedded in paraffin and stained with hematoxylin-eosin. Slides were examined under a light microscope and the oocytes were measured using the LAS EZ software, using the average between the largest and the smallest diameter of each oocyte for representation. There were six types of oocytes: Chromatin nucleolus: found in immature females, with average diameter of 9.5 ± 4.46 μm; Perinucleolar: present in all developmental stages with average diameter of 67.6 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.05.04.00-2 histology; Oogenesis; Fish reproduction; Vitellogenesis.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27570

Ovary maturation stages and oocyte features in three species of the neotropical fish Hemiodus (Müller, 1842)
Provedor de dados: 52
Autores: Brandão,Claudia Angelica da Silva; Valentim,Maria de Fátima Moraes; Caramaschi,Érica Pellegrini.
Macro- and microscopic ovarian features of Hemiodus microlepis, H. ternetzi and H. unimaculatus were analyzed. Based on these features we proposed an ovarian maturation scale. The nine stages of the preliminary macroscopic fieldwork scale were reduced to five after microscopic analysis of ovaries. The microscopic analysis indicated a group-synchronous oocyte development common to the three species that were characterized as iteroparous synchronous spawners with a total spawning type. The remarkable thickness of the zona radiata layer and the large size of vitellogenic oocytes of Hemiodus ternetzi distinguished this species from the others.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hemiodontid; Oocyte development; Zona radiata; Fish reproduction; Tocantins River.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000300015

Morphology of gonads, maturity and spawning season of Loricariichthys spixii (Siluriformes, Loricariidae) in a Subtropical Reservoir
Provedor de dados: 52
Autores: Duarte,Silvana; Araújo,Francisco Gerson; Sales,Armando; Bazzoli,Nilo.
The gonad morphology and spawning season of Loricariichthys spixii in Lajes reservoir were described based on 175 males and 613 females. Cells from the spermatogenic lineage were divided in four phases: spermatogonia (primary and secondary), spermatocytes (primary and secondary), spermatids and spermatozoa, and the cells from the ovocitarian lineage were divided in four phases: primary oocytes (O1), previtellogenic oocytes (O2), cortical vesicle oocytes (O3) and yolk globules or vitellogenic (O4). Five gonadal stages were described for the males/females according to oocytes and spermatogenic lineage cells distribution: resting (1); initial maturation (2a); advanced maturation (2b); partially spent/spawned (4a); totally spent/spawned (4b). Spawning was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loricariidae; Reservoir; Fish reproduction; Gonad morphology; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000700013

Surubim-do-Paraíba oocytes viability after being exposed to different cryoprotectants
Provedor de dados: 65
Autores: 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 &lt;1.7 mm) and mature (diameter &gt;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