Gonad Index
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Reproductive biology of Sciades herzbergii (Siluriformes: Ariidae) in a tropical estuary in Brazil
The present study investigated the reproductive biology of Sciades herzbergii in the Paraíba do Norte River Estuary, Brazil. We aimed to characterize the reproduction of the species with respect to sex ratio, spawning season, condition factor and length at first maturity. Specimens were captured between August 2009 and July 2010 in a stretch of the main cha
Zoologia (Curitiba). Publicado em: 2012-10
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2. Reprodução da albacora branca Thunns alalunga (Bonnaterre, 1788) capturada pela frota brasileira Espinheleira no Oceano Atlântico Sudoeste.
A albacora branca é uma das principais espécies de atuns capturadas no Atlântico sul pela frota atuneira brasileira. Entretanto, pouco é conhecido sobre a biologia da espécie nesta parte do Atlântico, principalmente no que se refere à reprodução, objetivo do presente estudo. Análises histológicas das gônadas de 735 indivíduos de Thunnus alalunga
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/06/2011
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3. Reproductive biology in the starfish Echinaster (Othilia) guyanensis (Echinodermata: Asteroidea) in southeastern Brazil
Echinaster (Othilia) guyanensis Clark, 1987 is an endangered starfish distributed throughout the Caribbean and Atlantic Ocean. Even though it has been extensively harvested, little is known about the biology and ecology of this starfish. Here, we examine reproduction seasonality in E. (O.) guyanensis. Individuals were collected monthly for one year, includin
Zoologia (Curitiba). Publicado em: 2010
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4. Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na Lagoa Fortaleza, Rio Grande do Sul, Brasil / Reproductive dynamics of Oligosarcus jenynsii and O. robustus (Characiformes, Characidae) in Fortaleza Lagoon, Rio Grande do Sul, Brazil
Oligosarcus jenynsii (Günther, 1864) and O. robustus Menezes, 1969 are fish species distributed in Rio Grande do Sul, Brazil, Uruguay, and northern Argentina. The reproductive period and recruitment, sex ratio, absolute and relative fecundity, and body length at first gonadal maturation of the two carnivorous species from Fortaleza Lagoon were analized. The
Publicado em: 2010
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5. Visual communication stimulates reproduction in Nile tilapia, Oreochromis niloticus (L.)
Reproductive fish behavior is affected by male-female interactions that stimulate physiological responses such as hormonal release and gonad development. During male-female interactions, visual and chemical communication can modulate fish reproduction. The aim of the present study was to test the effect of visual and chemical male-female interaction on the g
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-04
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6. Biologia reprodutiva da tainha Mugil liza Valenciennes e do Parati Mugil curema Valencienns (Actinopterygii, Mugilidae) na Baia de Sepetiba, RJ, Brasil
The reproductive biology of the mullets Mugil curema and Mugil liza was determined mainly by observing gonad development, size at maturation and fecundity. The objective of this study was to learn about the strategies developed by these species to maintain their exploited populations in an increasingly altered system. It was hypothesized that there are diffe
Publicado em: 2009
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7. Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na lagoa Fortaleza, Rio Grande do Sul, Brasil
Oligosarcus jenynsii (Günther, 1864) and O. robustus Menezes, 1969 are fish species distributed in Rio Grande do Sul, Brazil, Uruguay, and northern Argentina. The reproductive period and recruitment, sex ratio, absolute and relative fecundity, and body length at first gonadal maturation of the two carnivorous species from Fortaleza Lagoon were analized. The
Iheringia. Série Zoologia. Publicado em: 2004-03
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8. Biologia reprodutiva de três espécies simpátricas de peixes neotropicais: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus Garavello & Britski e Schizodon nasutus Kner (Characiformes, Anostomidae) do recém-formado Reservatório de Miranda, Alto Paraná
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 199
Revista Brasileira de Zoologia. Publicado em: 2002-09
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9. Estudo morfometrico gonadal : condição necessaria a confirmação histologica da disgenesia gonadal parcial
Background: Partial Gonadal Dysgenesis (pGD) is a sexual differentiation disorder characterized by bilateral dysgenetic testes, persistent Müllerian structures, and cryptorchidism in individuaIs with 46,XY karyotype. However, the histologic criteria for the diagnosis of PGD are poorly established. Objective: To determine gona dal histology in children with
Publicado em: 2001
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10. Aspectos da reprodução do peixe-porco, Balistes capriscus (Gmelin) (Actinopterygii, Tetraodontiformes, Balistidae) coletado na costa sul do Estado de São Paulo, Brasil
The monthly analysis of maturity stage frequency suggested that spawning of the grey triggerfish Balistes capriscus (Gmelin, 1788) is annual, total and occurs from November to February in the south of São Paulo State, Brazil. Size at first maturity is 169 mm for females and 200 mm for males. Condition factor estimated considering and disconsidering gonad we
Revista Brasileira de Zoologia. Publicado em: 2000-09