ArticleFish physiology and biochemistry2009
Effects of light and temperature conditions on the expression of GnRH and GtH genes and levels of plasma steroids in Odontesthes bonariensis females.
Article in Fish physiology and biochemistry, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed, 63 citations in OpenAlex.
- Photoperiodic regulation of reproduction and hypothalamic-pituitary-gonadal axis in Phoxinus lagowskii adults.Fish physiology and biochemistry · 2026Article
- Ovarian histology of the freshwater catfishHeliyon · 2024Article
- Expression profile of kisspeptin2 and gonadotropin-releasing hormone2 mRNA during photo-thermal and melatonin treatments in the female air-breathing catfish Heteropneustes fossilis.Fish physiology and biochemistry · 2020Article
- Photoperiodic effects on somatic growth and gonadal maturation in Mickey Mouse platy, Xiphophorus maculatus (Gunther, 1866).Fish physiology and biochemistry · 2020Article
- Influence of artificially induced light pollution on the hormone system of two common fish species, perch and roach, in a rural habitat.Conservation physiology · 2018Article
- Evaluation of Reference Genes to Analyze Gene Expression in SilversideFrontiers in genetics · 2018Article
- Conservation of the photoperiodic neuroendocrine axis among vertebrates: evidence from the teleost fish, Gasterosteus aculeatus.General and comparative endocrinology · 2012Article
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Authors and funding
3 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In this study we examined the endocrine mediation between environmental factors (temperature and photoperiod) and the brain-pituitary-gonadal axis in females of pejerrey Odontesthes bonariensis. Changes in the expression of brain gonadotropin-releasing hormones (GnRHs) and gonadotropin (GtH) subunit [follicle stimulating-beta (FSH-beta), luteinizing hormone-beta (LH-beta), glycoprotein hormone-alpha (GPH-alpha)] genes, plasma gonadal steroids [estradiol (E(2)) and testosterone (T)], gonadal histology, and gonadosomatic index (GSI) in adult females exposed to combinations of short-day (8 h) or long-day (16 h) photoperiods and low (12 degrees C) or high (20 degrees C) temperatures after winter conditions (8 h light, 12 degrees C) were analyzed. Pejerrey females kept under the short photoperiod had low GSIs, and their ovaries contained only previtellogenic oocytes regardless of the experimental temperature. In contrast, females exposed to the long photoperiod had high GSIs and ovaries with vitellogenic oocytes at both temperatures. These fish also showed a significantly higher expression of sGnRH, pjGnRH, cGnRH-II (the three different GnRH variants found to date in the pejerrey brain), FSH-beta, LH-beta and GPH-alpha genes and plasma E(2 )levels than those at the shorter photoperiod. No significant changes were observed in plasma T levels. Based on these results, we concluded that the increase in day length but not that of temperature triggers the maturation of pejerrey females after the winter period of gonadal rest and that this occurs by an integrated stimulation of the various components of the brain-pituitary-gonad axis.
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