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1. Can estrogens be considered as key elements of the challenge hypothesis? The case of intrasexual aggression in a cichlid fish

Author:
Scaia, María Florencia; Morandini, Leonel; Noguera, CristobalAlejandro; Trudeau, Vance L.; Somoza, Gustavo Manuel; Pandolfi, Matías
Source:
Physiology & behavior 2018 v.194 pp. 481-490
ISSN:
0031-9384
Subject:
Cichlasoma dimerus,   etc   ; aggression; aromatization; estrogens; females; males; physiological regulation; testosterone;     Show all 8 Subjects
Abstract:
... Territorial aggression has been widely studied in males and it has been historically suggested that androgens are key mediators of this behavior. However, more recent evidence suggests that it is the aromatization to estrogens, rather than androgens themselves, that is key to regulating this behavior. Females also display aggressive behaviors, but the physiological regulation of female aggression ...
DOI:
10.1016/j.physbeh.2018.06.028

2. Recovery of the Reproductive Capability Following Exposure to 4-tert-Octylphenol in the Neotropical Cichlid Fish Cichlasoma dimerus

Author:
Rey Vázquez, G.; Meijide, F. J.; Lo Nostro, F. L.
Source:
Bulletin of environmental contamination and toxicology 2016 v.96 no.5 pp. 585-590
ISSN:
0007-4861
Subject:
Cichlasoma dimerus,   etc   ; adults; eggs; epithelium; fish; males; testes; tropics;     Show all 8 Subjects
Abstract:
... Here, we analyzed the recovery of the reproductive capability in male Cichlasoma dimerus after exposure to sublethal concentrations of 4-tert-octylphenol (OP), a demonstrated estrogenic chemical. Adult fish were exposed to 0, 30, 150 and 300 μg/L OP during 60 days and subsequently transferred to OP-free water for another 60 days. At 150 and 300 μg/L, absence of fertilized spawnings were recorded d ...
DOI:
10.1007/s00128-016-1766-y

3. Cichlasoma dimerus responds to refeeding with a partial compensatory growth associated with an increment of the feed conversion efficiency and a rapid recovery of GH/IGFs axis

Author:
Delgadin, T.H.; Simó, I.; Pérez Sirkin, D.I.; Di Yorio, M.P.; Arranz, S.E.; Vissio, P.G.
Source:
Aquaculture nutrition 2018 v.24 no.4 pp. 1234-1243
ISSN:
1353-5773
Subject:
Cichlasoma dimerus,   etc   ; compensatory growth; feed conversion; fish; group housing; insulin-like growth factor I; insulin-like growth factor II; liver; messenger RNA; muscles; receptors; refeeding; somatotropin;     Show all 13 Subjects
Abstract:
... Many fish species display compensatory growth (CG), a phenomenon by which fasted fish grow faster during refeeding. However, most studies use a group‐housed fish approach that could be problematic in social fish when interaction between individuals is not considered or eliminated. Additionally, the growth hormone (GH)/insulin‐like growth factors’ (IGF‐1 and IGF‐2) axis is implicated in postnatal g ...
DOI:
10.1111/anu.12661

4. Dynamics of ovarian maturation throughout the reproductive cycle of the Neotropical cichlid fish Cichlasomadimerus (Teleostei, Cichliformes)

Author:
Varela, M.L.; Ferreira, M.F.; Da Cuña, R.H.; Lo Nostro, F.L.; Genovese, G.; Meijide, F.J.
Source:
Canadian journal of zoology 2017 v.95 no.7 pp. 485-498
ISSN:
1480-3283
Subject:
Cichlasoma dimerus,   etc   ; Cichliformes; Neotropics; aromatase; captive animals; estradiol; females; fish; gonadosomatic index; gonads; histology; monogamy; oocytes; ovarian development; spawning; steroids; vitellogenin; zona pellucida;     Show all 18 Subjects
Abstract:
... In this study, we analyzed gene expression profiles, plasma steroids concentrations, and gonadal morphology throughout the reproductive cycle of female Cichlasoma dimerus (Heckel, 1840), a monogamous cichlid fish exhibiting social hierarchies. Fish were analyzed at six phases encompassing their annual cycle, namely resting (during the nonreproductive period), prespawning, 30 h post spawning, 4 day ...
DOI:
10.1139/cjz-2016-0198

5. The SSRI fluoxetine exhibits mild effects on the reproductive axis in the cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)

Author:
Dorelle, Luciana S.; Da Cuña, Rodrigo H.; Rey Vázquez, Graciela; Höcht, Christian; Shimizu, Akio; Genovese, Griselda; Lo Nostro, Fabiana L.
Source:
Chemosphere 2017 v.171 pp. 370-378
ISSN:
0045-6535
Subject:
Cichlasoma dimerus,   etc   ; adults; drugs; endocrine-disrupting chemicals; females; foam cells; freshwater fish; males; reproduction; secretion; serotonin; sex hormones; testes; tropics; vitellogenin;     Show all 15 Subjects
Abstract:
... Among the wide variety of pharmaceuticals released into the environment, Fluoxetine (FLX), a selective serotonin reuptake inhibitor, is one of the most prescribed for the treatment of major depression. It inhibits serotonin (5-HT) reuptake at the presinaptic membrane, increasing serotonergic activity. In vertebrates, including fish, the serotonergic system is closely related to the Hypothalamic Pi ...
DOI:
10.1016/j.chemosphere.2016.11.141

6. Effects of waterborne exposure to 17β-estradiol and 4-tert-octylphenol on early life stages of the South American cichlid fish Cichlasoma dimerus

Author:
Meijide, Fernando J.; Rey Vázquez, Graciela; Piazza, Yanina G.; Babay, Paola A.; Itria, Raúl F.; Lo Nostro, Fabiana L.
Source:
Ecotoxicology and environmental safety 2016 v.124 pp. 82-90
ISSN:
0147-6513
Subject:
Cichlasoma dimerus,   etc   ; acute toxicity; aquatic environment; biomarkers; estradiol; feminization; fish; hormonal regulation; larvae; larval development; males; oocytes; ovarian development; risk; spermatogenesis; testes; xenoestrogens;     Show all 17 Subjects
Abstract:
... Estrogenic chemicals are often detected in the aquatic environment and can negatively affect animal development and reproduction. In teleost fishes, the hormonal regulation during a critical period of larval development has a strong influence on gonadal sex differentiation; thus this process may be affected by the exposure to environmental estrogens. In this study, we first assessed the lethal acu ...
DOI:
10.1016/j.ecoenv.2015.10.004

7. Mechanism of action of endosulfan as disruptor of gonadal steroidogenesis in the cichlid fish Cichlasoma dimerus Toxicology & pharmacology

Author:
Da Cuña, Rodrigo H.; Rey Vázquez, Graciela; Dorelle, Luciana; Rodríguez, Enrique M.; Guimarães Moreira, Renata; Lo Nostro, Fabiana L.
Source:
Comparative biochemistry and physiology 2016 v.187 pp. 74-80
ISSN:
1532-0456
Subject:
Cichlasoma dimerus,   etc   ; active ingredients; adenylate cyclase; animal ovaries; crops; endocrine-disrupting chemicals; endosulfan; estradiol; fish; follicle-stimulating hormone; forskolin; luteinizing hormone; luteinizing hormone receptors; mechanism of action; steroidogenesis; testes; testosterone; toxicity;     Show all 18 Subjects
Abstract:
... The organochlorine pesticide endosulfan (ES) is used in several countries as a wide spectrum insecticide on crops with high commercial value. Due to its high toxicity to non-target animals, its persistence in the environment and its ability to act as an endocrine disrupting compound in fish, ES use is currently banned or restricted in many other countries. Previous studies on the cichlid fish Cich ...
DOI:
10.1016/j.cbpc.2016.05.008

8. Growth hormone, luteinizing hormone, and follicle-stimulating hormone regulation by neuropeptide Y in both sexes of the cichlid fish, Cichlasoma dimerus

Author:
Di Yorio, M. P.; Delgadin, T. H.; Pérez Sirkin, D. I.; Vissio, P. G.
Source:
Fish physiology and biochemistry 2015 v.41 no.4 pp. 843-852
ISSN:
0920-1742
Subject:
Cichlasoma dimerus,   etc   ; Western blotting; animals; culture media; fasting; females; fluorescent antibody technique; follicle-stimulating hormone; gene expression; in vitro studies; luteinization; luteinizing hormone; males; messenger RNA; neuropeptide Y; quantitative polymerase chain reaction; somatotropin;     Show all 17 Subjects
Abstract:
... Neuropeptide Y (NPY) is considered the most potent orexigenic peptide, increasing before meal time and during fasting. In teleost, most studies on NPY action upon growth hormone (GH) and luteinizing hormone (LH) were conducted in females or group of animals without sex discrimination. The aim of this study was to evaluate whether NPY modulates the expression and release of GH and gonadotropins in ...
DOI:
10.1007/s10695-015-0051-z

9. Nonmonotonic response of vitellogenin and estrogen receptor α gene expression after octylphenol exposure of Cichlasoma dimerus (Perciformes, Cichlidae)

Author:
Genovese, G.; Regueira, M.; Da Cuña, R.H.; Ferreira, M.F.; Varela, M.L.; Lo Nostro, F.L.
Source:
Aquatic toxicology 2014 v.156 pp. 30-40
ISSN:
0166-445X
Subject:
Cichlasoma dimerus,   etc   ; additives; cytoplasm; detergents; dose response; ecotoxicology; estrogen receptors; estrogens; fish; freshwater; gene expression; genes; hepatocytes; humans; ligands; liver; males; manufacturing; messenger RNA; plastics; spermatozoa; testes; transcriptional activation; vitellogenesis; vitellogenin; wildlife; xenoestrogens;     Show all 27 Subjects
Abstract:
... In oviparous vertebrates, vitellogenin (VTG) is mainly produced by the liver in response to estrogen (E2) and its synthesis is traditionally coupled to estrogen receptor alpha induction. Even though VTG is a female-specific protein, chemicals that mimic natural estrogens, known as xenoestrogens, can activate its expression in males causing endocrine disruption to wildlife and humans. Alkylphenols ...
DOI:
10.1016/j.aquatox.2014.07.019

10. Endosulfan affects GnRH cells in sexually differentiated juveniles of the perciform Cichlasoma dimerus

Author:
Piazza, Yanina; Pandolfi, Matías; Da Cuña, Rodrigo; Genovese, Griselda; Lo Nostro, Fabiana
Source:
Ecotoxicology and environmental safety 2015 v.116 pp. 150-159
ISSN:
0147-6513
Subject:
Cichlasoma dimerus,   etc   ; body weight; chemical speciation; cytoplasm; endocrine-disrupting chemicals; endosulfan; fish; follicle-stimulating hormone; freshwater; gonadotropin-releasing hormone; gonads; juveniles; larvae; mechanism of action; models; morphometry; mortality; neurons; nontarget organisms; nutritional status; reproductive fitness; sex ratio; sexual maturity; subchronic exposure; toxicity;     Show all 25 Subjects
Abstract:
... Endosulfan (ES) is an organochlorine pesticide widely used in agriculture despite its high toxicity towards non-target organisms such as fish. It has been demonstrated that ES can cause negative effects on aquatic animals, including disruption of hormonal systems. However, the alterations produced by this pesticide on the reproductive axis of fish prior to sexual maturity, as well as possible mode ...
DOI:
10.1016/j.ecoenv.2015.03.013