Distribution of GnRH in the brain of the freshwater teleost Astyanax altiparanae ()

Gomes, Chayrra Chehade; Costa, Fabiano Gonçalves; Borella, Maria Inês

doi:10.1016/j.micron.2013.07.008

Cited by 30 publications

(22 citation statements)

References 51 publications

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“…Particularly, terminals containing tyrosine hydroxylase have been observed (Bosler, 1977;Gómez-Segade et al, 1986;Butler, Hodos, 2005). This region also contains high density of GnRH positive fibers in most teleost fish studied thus far Gomes et al, 2013).…”

Section: Discussionmentioning

confidence: 97%

“…They have also been reported to secrete neurotransmitters like dopamine (DA), gamma-amino butyric acid (GABA) and serotonin (Fryer, Maler, 1981, Norris, 2007Greenwood et al, 2008;Cerdá-Reverter, Canosa, 2009;Gomes et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…In teleost fish, nuclei of this region (Hv, Hl and ATN) secrete melanin-concentrating hormone (MCH), TRH and GnRH, among other neurohormones. Neurotransmitters and neuromodulators like DA, GABA, NPY and serotonin are also secreted by these nuclei (Butler, Hodos, 2005;Norris, 2007, Cerdá-Reverter, Canosa, 2009, Kawauchi et al, 2009Gomes et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Rincón¹,

Obando

Tovar

et al. 2017

Neotrop. ichthyol.

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Topological and histological descriptions of the preoptic area and hypothalamus of the cardinal tetra Paracheirodon axelrodi were performed. Standard histological paraffin sections were used and stained with Nissl technique, and plastic sections for high-resolution optic microscopy (HROM). The preoptic area showed some differences related to the location of the magnocellular preoptic nucleus (PM) and the size of the neurons in this region, as they were the biggest in all the preoptic area. Additionally, within the preoptic area, the different structures that comprise the organum vasculosum of the lamina terminalis (OVLT) were identified and characterized. The hypothalamus could be subdivided in three regions -the ventral, the dorsal and the caudal hypothalamic regions -neuron morphology, size and staining pattern were similar in all of them.Keywords: Brain, High resolution optic microscopy (HROM), Organum vasculosum of the lamina terminalis (OVLT).Se realizó la descripción topológica e histológica del área preóptica e hipotálamo en el Neón cardenal Paracheirodon axelrodi. Se usaron cortes obtenidos con tecnicas histológicas estándar, coloreados con técnica de Nissl y secciones en resina con microscopía óptica de alta resolución (MOAR). El área preóptica muestra algunas diferencias relacionadas con la localización del núcleo preóptico magnocelular (PM) y el tamaño de algunas neuronas en esta región, puesto que estas eran las más grandes de toda el área preoptica. Adicionalmente, dentro del área preóptica, fue posible identificar y caracterizar las diferentes estructuras que componen el órgano vasculoso de la lámina media (OVLM). El hipotálamo puede sudividirse en tres zonas: la zona hipotalámica ventral, la zona hipotalámica dorsal y la zona hipotalámica caudal. La morfología de las neuronas de los núcleos que comprenden las diferentes zonas del hipotálamo tiene tamaño, forma y coloración similar.Palabras Clave: Cerebro, Microscopía óptica de alta resolucion (MOAR), Órgano vasculoso de la lámina terminal (OVLT).

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Rincón¹,

Obando

Tovar

et al. 2017

Neotrop. ichthyol.

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“…Its current production is primarily destined for commercialization as live bait and human consumption (Ferreira et al, 2014). Besides, it has also been used as a fish model (Gomes et al, 2013;Yasui et al, 2014;Adamov et al, 2017;Nascimento et al, 2017) due to characteristics as rapid growth, simple handling, acceptance of artificial feeding and high prolificacy (Gonçalves et al, 2014). A. altiparanae females and males reach gonadal maturation at the fifth month of life, approximately (Garutti, 2003), and show partial spawning from September to March (Porto-Foresti et al, 2010); this restriction of spawning season limits the product offer throughout the year.…”

Section: Introductionmentioning

confidence: 99%

Environmental manipulation on Astyanax altiparanae out of season spawning

Machado-Evangelista¹,

Sussel²,

Romagosa

2019

LAJAR

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This study aimed to evaluate the effect of manipulating hours of light and water temperature in some important reproductive parameters for Astyanax altiparanae fish farming during winter. The experiment was conducted from July 3 rd to August 28 th 2013 (57 days), and two groups of 32 couples of fish (G1 and G2) were used. On G1, hours of light and water temperature were not controlled; on G2, otherwise, these variables were manipulated in order to achieve similar conditions to those observed in spring. Every 14 days, eight couples of each group were hormonally induced with carp pituitary gland extract, and eggs were collected after semi-natural spawning. The percentage of females from G2 that spawned was higher than G1 (81.25 vs. 9.38%), the same trend was observed for a number of eggs produced per female (G1: 2,976.57 ± 1,085.71; G2: 8,471.14 ± 860.08). The G2 ovaries presented a higher incidence of primary growth oocytes and post-ovulatory follicles whereas G1 ovaries had more atretic follicles. Economic analysis showed that operational profit from eggs and larvae production on G2 was higher than on G1, as well as the gross margin. In conclusion, the results showed that environmental manipulation might improve reproduction management practices extending eggs and larvae production during the natural non-breeding season. Further studies are necessary to determine more appropriate facilities to be used by farmers in large scale, as well as management protocols to ensure the survival of post-larvae.

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“…Even with a significant increase in its annual production (6% between 2013 and 2014 (IBGE, 2014)), currently it does not meet the existing demand (ROSA and SIMÕES, 2016). This species is also important for fishing, as well as for restocking programs (HASHIMOTO et al, 2015), and has been widely used as a model in studies concerning fish reproduction (SILVA et al, 2011;WEBER et al, 2013;GOMES et al, 2013;ADOLFI et al, 2015;CHEHADE et al, 2015;YASUI et al, 2015;SANTANA et al, 2015;KIDA et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

Bol. Inst. Pesca

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In this study, we evaluated the possibility of obtaining successive Astyanax altiparanae spawns under laboratory conditions. In order to do so, 104 specimens were randomly distributed into four boxes (10 females and 16 males each) and kept in a recirculation system at an average temperature of 29.24 ± 0.42 °C, under natural photoperiod, for 30 days. On the onset of the experiment, males and females were induced for reproduction with a 6 mg kg -1 carp pituitary extract dose. After that, ovary (for gonadosomatic index and stereological assessment) and blood samples (for steroid evaluation) were collected from eight females (two per box) at the following moments: immediately after hormonal induction (day 0) and on days 1, 6, 16 and 30 after spawning. On day 6, spawned females presented complete mature ovaries similar to those on day 0 and, in this period, we did not observe postovulatory complexes, indicating that their resorption happened very fast. Concomitantly, the steroid levels increased gradually up to day 6, which corroborated an intense vitellogenic activity in this period. This study has demonstrated that A. altiparanae females are suitable for induced spawning within six days after spawning, when kept at 29.24 ± 0.42 °C, in a system maintained with recirculated water. MATURAÇÃO OVARIANA DEAstyanax altiparanae APÓS DESOVA EM SISTEMA DE RECIRCULAÇÃO DE ÁGUA RESUMO Neste estudo, avaliamos a possibilidade de obtenção de desovas sucessivas de Astyanax altiparanae mantidos em biotério. Para isso, 104 indivíduos foram distribuídos aleatoriamente em quatro caixas (10 fêmeas e 16 machos em cada) e mantidos a uma temperatura média de 29,24 ± 0,42 °C, sob fotoperíodo natural, por 30 dias. No início do experimento, machos e fêmeas foram induzidos à reprodução com uma dose de extrato de hipófise de carpa (6 mg kg -1 ). Posteriormente, amostras de ovário (para cálculo do índice gonadosomático e avaliação estereológica) e de sangue (para avaliação de esteroides) foram coletadas de oito fêmeas (duas por caixa) nos seguintes períodos: imediatamente após a indução hormonal (dia 0) e 1, 6, 16 e 30 dias após a desova. No dia 6, as fêmeas desovadas já apresentavam ovários maduros completos similares aos descritos no dia 0. No dia 6 não foram mais observados complexos pós-ovulatórios, indicando que a sua reabsorção foi relativamente rápida. Concomitantemente, os níveis de esteroides aumentaram gradativamente até o dia 6, corroborando uma atividade vitelogênica intensa neste período. Neste estudo demonstramos que fêmeas de A. altiparanae apresentam-se aptas para indução hormonal seis dias após a reprodução, quando mantida a 29,24 ± 0,42 °C, em um sistema mantido com água recirculada. Palavras-chave: desovas sucessivas; vitelogênese; estradiol; 17α-hydroxiprogesterona.

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Distribution of GnRH in the brain of the freshwater teleost Astyanax altiparanae ()

Cited by 30 publications

References 51 publications

Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Topological and histological description of preoptic area and hypothalamus in cardinal tetra Paracheirodon axelrodi (Characiformes: Characidae)

Environmental manipulation on Astyanax altiparanae out of season spawning

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