Immunoneutralization of gonadotropin-releasing hormone type-III suppresses male reproductive behavior of cichlids

Ogawa, Satoshi; Akiyama, Go; Kato, Shu Mei; Soga, Tomoko; Sakuma, Yasuo; Parhar, Ishwar S.

doi:10.1016/j.neulet.2006.02.041

Cited by 83 publications

(52 citation statements)

References 26 publications

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“…The correlation between GnRH1 and GnRH3 with sexual behavior and nest-building was previously reported for blue gourami and other fish [44,45]. Thus, it is suggested that in non-reproductively active males, an increase in water salinity and conductivity induces GnRH1gene expression, which in turn increases GtH and PRL synthesis.…”

Section: Discussionsupporting

confidence: 55%

Underground water affects sexual behavior and gene expression of hormones related to reproduction in blue gourami males

Degani¹,

Lévy²

2013

ABC

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This study examined the effect of underground water on reproduction-and growth-related hormones in blue gourami males under non-reproductive and reproductive conditions. An increase in the percentage of males building nests under the highest percentage of underground water were compared to fish that maintained a lower percentage of underground water in the first two days. The % Gonado-somatic index (GSI) of males building nests was higher than nonreproductively active males in water containing the lowest concentration of underground water. In nonreproductively active males, brain gonadotropin releasing hormone 1 (GnRH1) and pituitary β subunit of gonadotropins (GtHs) and prolactin (PRL) mRNA levels were significantly higher in males maintained in underground water. In reproductively active males, mRNA levels of brain GnRH1, gonadotropin releasing hormone 3 (GnRH3) and pituitary PRL mRNA levels were significantly higher than males maintained in underground water. Thus, it is suggested that underground water with high salinity and conductivity levels affects the gene expression of reproduction-related hormones; in reproductively active males, it shortened the duration of nest-building by blue gourami males.

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Section: Discussionsupporting

confidence: 55%

Underground water affects sexual behavior and gene expression of hormones related to reproduction in blue gourami males

Degani¹,

Lévy²

2013

ABC

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“…Reversible changes in reproductive competence, adoption of distinct reproductive strategies within one sex, and reversible or permanent changes in gonadal sex are examples of the influence of the behavior on the reproduction (Ross, 1990;Taborsky, 1994). In this context, cichlids (Perciformes: Cichlidae) have been intensively used as experimental models for studies of social control of reproduction, in particular African cichlids, such as the African tilapia Astatotilapia burtoni (Günther, 1894) (= Haplochromis burtoni) and Oreochromis mossambicus (Peters, 1852) (Fox et al, 1997;Ogawa et al, 2006). Behavior of African cichlids is better characterized than the Neotropical cichlids, and most of whose species have not been extensively studied at the behavioral level.…”

Section: Introductionmentioning

confidence: 99%

Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions

Alonso

Canepa

Moreira³

et al. 2011

Neotrop. ichthyol.

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In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an opaque grey one. Black ventral coloration was associated with reproductive individuals. Courtship displays, which were similar to threatening displays, had the common effect of increasing the visible area of the individual. The dominant male was always the largest one suggesting that size is probably a major factor determining the hierarchy establishment and that these intra-sexually selected traits may have been reinforced by inter-sexual selection. Reproductive males had higher pituitary levels of -follicle stimulating hormone (-FSH) and somatolactin (SL) than non reproductive ones, while no differences were found among females. No differences were found among male gonadosomatic indexes. Non reproductive individuals had higher plasma cortisol levels for both sexes. It is possible that dominant reproductive individuals may be inhibiting reproduction of subordinate fish through physical contact, increasing their cortisol levels and diminishing FSH and SL pituitary content. However, this was not reflected as an inhibition at the gonadal level in our experimental design.En este trabajo se describen por primera vez el comportamiento social y reproductivo del pez cíclido neotropical Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endémico de la cuenca del Paraná, desde un enfoque integral y abarcador, incluyendo características morfológicas y fisiológicas. Éste pez incubador de substrato, tiene cuidado biparental de las crías y presenta una jerarquía de dominancia que determina el acceso a territorios reproductivos entre los machos, y a machos con territorios entre las hembras. Se observó un comportamiento gregario con una coloración corporal pálida característica, antes que comenzaran los comportamientos reproductivos. Luego, una jerarquía de dominancia se estableció a través de interacciones agresivas. Los individuos territoriales presentaron patrones de coloración corporal brillantes y los individuos no territoriales uno gris opaco. Una coloración ventral oscura fue observada asociada a individuos reproductivos. Los despliegues de cortejo fueron similares a los de amenaza y tuvieron la característica común de aumentar el área visible de los peces. El macho dominante fue siempre el más grande, sugiriendo que probablemente la fuerza (tamaño) es un facto...

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“…GnRH2 and GnRH3 have neuromodulatory effects [51,20] and influence reproductive behavior [32,45,47,52], but a comprehensive understanding of the neurological function of these ligands is lacking. GnRH3 neurons generally have an overlapping distribution with GnRH1 neurons and in fish that lack GnRH1, GnRH3 can compensate for the loss by assuming the hypophysiotrophic function of GnRH1 [23].…”

Section: Gnrh-r1b Gnrh-r2amentioning

confidence: 99%

“…All receptors investigated in vitro show highest affinity for GnRH2 followed by GnRH3 and GnRH1 [7,18,34,38], but the relative affinities vary considerably such that GnRH1 and GnRH3 activity is higher relative to GnRH2 in fish Type II GnRH-R [11,34,41]. GnRH ligand forms are expressed in different brain regions and stimulate synthesis and release of gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), in addition to being involved in neuron development [1,35], neuromodulation [51,20] and reproductive behavior [32,45,47,52].…”

Section: Introductionmentioning

confidence: 99%

Differential regulation of GnRH ligand and receptor genes in the brain and pituitary of Atlantic cod exposed to different photoperiod

Hildahl

Taranger

Norberg

et al. 2013

General and Comparative Endocrinology

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Immunoneutralization of gonadotropin-releasing hormone type-III suppresses male reproductive behavior of cichlids

Cited by 83 publications

References 26 publications

Underground water affects sexual behavior and gene expression of hormones related to reproduction in blue gourami males

Underground water affects sexual behavior and gene expression of hormones related to reproduction in blue gourami males

Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions

Differential regulation of GnRH ligand and receptor genes in the brain and pituitary of Atlantic cod exposed to different photoperiod

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