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Gonadal remodeling and hormonal regulation during sex change of juvenile dusky grouper Epinephelus marginatus (Teleostei, Serranidae), an endangered protogynous hermaphrodite fish
(2020-10-01)
Sex change was induced in Epinephelus marginatus juveniles using a nonsteroidal aromatase inhibitor (AI), a synthetic androgen (17α-methyltestosterone; MT), and a combination of both (MT + AI) in a 90-day experiment. A ...
Influence of pejerrey Odontesthes bonariensis (Valenciennes, 1835) broodstock age on gamete quality, reproductive performance and plasma sex steroid levels during the spawning season
(2016-03-01)
This study evaluated the effect of pejerrey Odontesthes bonariensis (Valenciennes, 1835) broodstock age on gamete and spawning quality and its relationship with sex steroid plasma levels. Sperm was analysed using a ...
Influence of pejerrey Odontesthes bonariensis(Valenciennes, 1835) broodstock age on gamete quality, reproductive performance and plasma sex steroid levels during the spawning season
(Wiley Blackwell Publishing, Inc, 2014-08)
This study evaluated the effect of pejerrey Odontesthes bonariensis (Valenciennes, 1835) broodstock age on gamete and spawning quality and its relationship with sex steroid plasma levels. Sperm was analysed using a ...
Reproductive and parental care physiology of Cichlasoma dimerus males
(Academic Press Inc Elsevier Science, 2015-09)
The South American cichlid fish Cichlasoma dimerus presents a high breeding frequency and biparental care of the eggs and larvae. The male parental care period was divided in four different phases according to the developmental ...
Influence of pejerrey Odontesthes bonariensis (Valenciennes, 1835) broodstock age on gamete quality, reproductive performance and plasma sex steroid levels during the spawning season
(Wiley, 2016-08)
This study evaluated the effect of pejerrey Odontesthes bonariensis (Valenciennes, 1835) broodstock age on gamete and spawning quality and its relationship with sex steroid plasma levels. Sperm was analysed using a ...
The interrenal gland in males of the cichlid fish Cichlasoma dimerus: relationship with stress and the establishment of social hierarchies
(Elsevier Inc.Maryland Heights, 2014-01)
In teleosts, cortisol is the primary glucocorticoid secreted by the steroidogenic cells of the interrenal gland and an increase in its plasma concentration is a frequent indicator of stress. Cortisol has been postulated ...
Dominance hierarchies and social status ascent opportunity: Anticipatory behavioral and physiological adjustments in a Neotropical cichlid fish
(Pergamon-Elsevier Science Ltd, 2012-07)
In this work we characterized the social hierarchy of non-reproductive individuals of Cichlasoma dimerus (Heckel, 1840), independently for both sexes, and its relationship to the opportunity for social status ascent. Female ...
Effects of gonadotropin-inhibitory hormone on early and late stages of spermatogenesis in ex-vivo culture of zebrafish testis
(Elsevier B.V., 2021-01-15)
Gonadotropin-inhibitory hormone (Gnih) is known to play a role in the regulation of reproduction in vertebrates by influencing gonadotmpin release and synthesis. While the endocrine actions of Gnih have been identified in ...
A teleost fish model to understand hormonal mechanisms of non-breeding territorial behavior
(Frontiers Media, 2020)
Aggressive behaviors occurring dissociated from the breeding season encourage the search of non-gonadal underlying regulatory mechanisms. Brain estrogen has been shown to be a key modulator of this behavior in bird and ...
Potencial estrogênico de metais pesados, xenoestrógenos e estrógenos naturais em peixes neotropicais em condições naturais e experimentais
(Universidade Federal de Minas GeraisBrasilICB - INSTITUTO DE CIÊNCIAS BIOLOGICASPrograma de Pós-Graduação em Biologia CelularUFMG, 2019-03-25)
Fish reproduction, as in other vertebrates, is controlled by the hypothalamic-pituitary-gonadal (HPG) axis. Adequate environmental conditions serve as a "trigger", leading to the release of gonadotrophin releasing hormone ...