Male silver eels mature by swimming

BACKGROUND: If European silver eels are prevented from reproductive migration, they remain in a prepubertal stage by dopaminergic inhibition of pituitary activity. Because this inhibition is likely a requirement for an extended female growth stage, we tested if it is sex-specific by subjecting both...

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Detalles Bibliográficos
Autores principales: Palstra, Arjan P, Schnabel, Denhi, Nieveen, Maaike C, Spaink, Herman P, van den Thillart, Guido EEJM
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2474648/
https://www.ncbi.nlm.nih.gov/pubmed/18616800
http://dx.doi.org/10.1186/1472-6793-8-14
Descripción
Sumario:BACKGROUND: If European silver eels are prevented from reproductive migration, they remain in a prepubertal stage by dopaminergic inhibition of pituitary activity. Because this inhibition is likely a requirement for an extended female growth stage, we tested if it is sex-specific by subjecting both sexes to stimulation by GnRHa (Gonadotropin-Releasing Hormone agonist) – injection or 3-months swimming in seawater. RESULTS: In contrast to females, males showed a two- to three-fold higher LHβ (luteinising hormone β subunit) – expression, a three- to five-fold higher GSI (Gonadosomatic index) and induced spermatogenesis when compared with the untreated control group. CONCLUSION: Dopaminergic inhibition is thus not effective in males and swimming results in natural maturation, probably via GnRH-release.

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