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Omer Sid-Ahmed et al.
Environmental toxicology and chemistry, 32(6), 1332-1336 (2013-02-14)
11-Oxoetiocholanolone and related substances are important metabolites of cortisol and are excreted via feces in ruminants. To investigate whether 11-ketotestosterone (11-KT) or its immunoreactive metabolites are formed and excreted in ruminant feces, an enzyme immunoassay (EIA) was developed and validated.
Shogo Higaki et al.
Scientific reports, 7, 42852-42852 (2017-02-18)
Many endemic fish species are threatened with extinction. Conservation strategies and the restoration of endemic fish after extinction must therefore be investigated. Although sperm cryopreservation is indispensable for the conservation of endangered fishes, the limited number of mature fish and
J L Saraiva et al.
Fish physiology and biochemistry, 39(1), 85-89 (2012-05-31)
The inter-populational variation in the reproductive behaviour of the peacock blenny Salaria pavo (Risso 1810), particularly the influence of the ecologic environment, was reviewed in the present work. Two populations of this species inhabiting contrasting environments were studied: the Ria
Ajay Pradhan et al.
Chemico-biological interactions, 233, 35-45 (2015-03-31)
The brominated flame retardants (BFRs) 1,2-dibromo-4-(1,2-dibromoethyl)cyclohexane (TBECH or DBE-DCBH) and allyl 2,4,6-tribromophenyl ether (ATE or TBP-AE) are alternative BFRs that have been introduced to replace banned BFRs. TBECH is a potential endocrine disrupter in human, chicken and zebrafish and in
Yoshiko Iwasaki-Takahashi et al.
Communications biology, 3(1), 308-308 (2020-06-17)
Combining cryopreservation of germline stem cells (GSCs) with their subsequent transplantation into recipient fish is a powerful tool for long-term preservation of genetic resources of endangered fishes. However, application of this technique has been limited because endangered species sometimes have
Chien-Ju Lin et al.
Developmental neurobiology, 76(2), 121-136 (2015-05-20)
The early brain development, at the time of gonadal differentiation was investigated using a protandrous teleost, black porgy. This natural model of monosex juvenile fish avoids the potential complexity of sexual dimorphism. Brain neurogenesis was evaluated by histological analyses of
Juliane S Amaral et al.
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 230, 106-114 (2019-01-21)
The Amazonian pirarucu, Arapaima gigas, belongs to a phylogenetically basal group of teleosts (family Osteoglossidae). The commercial importance and the overexploited status of natural stocks of A. gigas brought the interest to rear it in the Amazon region, but rearing
Jiaxing Chen et al.
Journal of fish biology, 94(3), 414-421 (2019-01-27)
Socially controlled sex change in teleosts is a dramatic example of adaptive reproductive plasticity. In many cases, the occurrence of sex change is triggered by a change in the social context, such as the disappearance of the dominant individual. The
Estefany L García-Cruz et al.
Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 245, 110701-110701 (2020-04-17)
The pejerrey is an atherinopsid species from South America that presents a combination of genotypic and environmental (temperature-dependent) sex determination whereby low and high temperatures induce feminization and masculinization, respectively. Masculinization involves a heat-induced stress response leading to increased circulating
A G Little et al.
The Journal of experimental biology, 223(Pt 14) (2020-06-21)
Female-biased mortality has been repeatedly reported in Pacific salmon during their upriver migration in both field studies and laboratory holding experiments, especially in the presence of multiple environmental stressors, including thermal stress. Here, we used coho salmon (Oncorhynchus kisutch) to
Andrew D Southam et al.
Environmental science & technology, 45(8), 3759-3767 (2011-03-18)
The ability of targeted and nontargeted metabolomics to discover chronic ecotoxicological effects is largely unexplored. Fenitrothion, an organophosphate pesticide, is categorized as a "red list" pollutant, being particularly hazardous to aquatic life. It acts primarily as a cholinesterase inhibitor, but
Peter D Dijkstra et al.
Hormones and behavior, 61(4), 518-526 (2012-02-01)
The diverse cichlid species flocks of the East African lakes provide a classical example of adaptive radiation. Territorial aggression is thought to influence the evolution of phenotypic diversity in this system. Most vertebrates mount hormonal (androgen, glucocorticoid) responses to a
Yi-Lin Yan et al.
Developmental dynamics : an official publication of the American Association of Anatomists, 246(11), 925-945 (2017-09-01)
Aberrant signaling between germ cells and somatic cells can lead to reproductive disease and depends on diffusible signals, including transforming growth factor-beta (TGFB) -family proteins. The TGFB-family protein Gsdf (gonadal soma derived factor) controls sex determination in some fish and
Ana S Félix et al.
G3 (Bethesda, Md.), 10(6), 1971-1982 (2020-04-12)
It has been hypothesized that androgens respond to the social interactions as a way to adjust the behavior of individuals to the challenges of the social environment in an adaptive manner. Therefore, it is expected that transient changes in circulating
Azadeh Hatef et al.
Aquatic toxicology (Amsterdam, Netherlands), 122-123, 181-187 (2012-07-24)
In mammals, vinclozolin (VZ) is known as anti-androgen, which causes male infertility via androgen receptor (AR) antagonism. In aquatic animals, the VZ effects on reproductive functions are largely unknown and results are somewhat contradictory. To understand VZ adverse effects on
Wei Wang et al.
Frontiers in endocrinology, 11, 115-115 (2020-04-10)
11-ketotestosterone (11-KT) is a non-aromatizable and the most potent androgen in a few teleost. It has been reported that 11-KT in serum had a high concentration and increased sharply before the period of yolk deposition in females of few fishes.
Romain Fontaine et al.
The Journal of endocrinology, 245(1), 21-37 (2020-01-25)
Follicle-stimulating hormone (Fsh) and luteinizing hormone (Lh) produced by the gonadotropes play a major role in control of reproduction. Contrary to mammals and birds, Lh and Fsh are mostly produced by two separate cell types in teleost. Here, we investigated
Karen P Maruska et al.
The Journal of comparative neurology, 528(15), 2499-2522 (2020-03-20)
Estrogen synthesis and signaling in the brains of vertebrates has pleotropic effects ranging from neurogenesis to modulation of behaviors. The majority of studies on brain-derived estrogens focus on males, but estrogenic signaling in females likely plays important roles in regulation
Amy L Filby et al.
Environmental science & technology, 46(6), 3472-3479 (2012-03-01)
Environmental estrogens have been shown to affect aspects of fish behavior that could potentially impact on wild populations, but the physiological mechanisms underpinning these effects are unknown. Using small colonies of zebrafish (Danio rerio), we evaluated the impacts of estrogen
Qing Wang et al.
Chemosphere, 221, 235-245 (2019-01-15)
Bisphenol A (BPA) is an abundant endocrine-disrupting compound that is found in the aquatic environment and has adverse effects on fish reproduction; however, the exact pathway of these impacts is unclear. In this study, the different effects of BPA on
Li-Na Sun et al.
Endocrinology, 155(4), 1476-1488 (2014-01-21)
Females with differentiated ovary of a gonochoristic fish, Nile tilapia, were masculinized by long-term treatment with an aromatase inhibitor (Fadrozole) in the present study. The reversed gonads developed into functional testes with fertile sperm. The longer the fish experienced sex
Shogo Higaki et al.
Zygote (Cambridge, England), 25(5), 652-661 (2017-08-25)
Sperm cryopreservation is a valuable conservation method for endangered fish species. Here we report an easy and efficient cryopreservation method for juvenile whole testis by vitrification and successful sperm production from the vitrified whole testis via in vitro spermatogenesis in
Maria C Escalante-Rojas et al.
Ecotoxicology and environmental safety, 208, 111502-111502 (2020-10-30)
The reproductive physiology of fish can be changed by the presence of pollutants in the water, which act as endocrine disrupting compounds (EDC). We evaluated the impacts of water contaminants in polluted reservoirs acting as possible EDC on the reproductive
Harpreet Bhatia et al.
Journal of applied toxicology : JAT, 35(7), 806-816 (2014-10-29)
The aim of the present study was to evaluate whether long-term exposures to environmentally relevant concentrations of di-n-butyl phthalate (DnBP) disrupt the reproduction-based endpoints in juvenile Murray rainbowfish (Melanotaenia fluviatilis). Fish were exposed to 5, 15 or 50 µg l(-1) DnBP for
Rachel M Genova et al.
Hormones and behavior, 62(4), 426-432 (2012-08-14)
Behavioral and neuroendocrine mechanisms of social vocalization in teleost fish are influenced by the glucocorticoid cortisol and the androgen 11-ketotestosterone (11kT). The relative abundance of both 11kT, which binds to androgen receptors (ARα, ARβ), and cortisol, which binds to glucocorticoid
Viet D Dang
Journal of chromatographic science, 59(1), 7-14 (2020-10-21)
Sex steroid hormones are potential biomarkers of reproductive function in teleost fish, but their measurement continues to rely on antibody-based assays. The objective of this study was to optimize a robust and simultaneous liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for
Teresa Fagundes et al.
Physiology & behavior, 107(3), 283-291 (2012-08-15)
Phenotypic change in response to variation in environmental cues has been widely documented in fish. Transitions in social dominance, in particular, have been shown to induce a rapid switch in reproductive phenotypes in many species. However, this effect has been
Géraldine Fazio et al.
The Journal of parasitology, 98(4), 695-705 (2012-03-13)
The introduced parasite Anguillicoloides crassus is thought to play an important role in the decline of freshwater eel (Anguilla spp.) populations. These nematodes are known to negatively affect many fitness-related traits in eels. We used experimental infections to study the
Wen-Jun Shi et al.
Aquatic toxicology (Amsterdam, Netherlands), 212, 70-76 (2019-05-12)
Medroxyprogesterone acetate (MPA) is a widely used synthetic progestin and it has been frequently detected in aquatic environments. However, its effects on aquatic organisms remain largely unknown. Here we investigated the chronic effects of MPA on sex differentiation and gonad
Adriana E Sardi et al.
General and comparative endocrinology, 221, 144-155 (2015-01-27)
Steroidogenesis, the process by which steroid hormones are synthesized, involves a vast number of enzymes and biochemical pathways that are susceptible to chemical modulation. Endocrine disrupting compounds (EDCs) are of special concern since they can alter hormone homeostasis by interfering
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