Abstract
Reproductive hormones play essential roles in the control of reproduction and gonadal maturation in fish. The purpose of this study was to determine the effects of cortisol administration (10 µg/g or 50 µg/g) or red light irradiation at two intensities (0.5 W/m2 or 1.0 W/m2) on the reproductive hormones in goldfish (Carassius auratus). The effects of different treatments were analyzed by determining the mRNA expression levels of gonadotropin-inhibitory hormone receptor (GnIH-R), chicken gonadotropin-releasing hormone (cGnRH-II), salmon GnRH (sGnRH), FSHβ, LHβ, and plasma testosterone and the level of 17β-estradiol for 48 h. Additionally, by double immunofluorescence staining, we detected the expression of both GnIH and GnRH in the diencephalons of goldfish brains. The mRNA expression of GnIH-R was significantly higher in the cortisol group and red light–irradiated group from 3 to 48 h than in the control group. Additionally, the mRNA levels of cGnRH-II, sGnRH, FSHβ, LHβ, testosterone, and 17β-estradiol were significantly lower in the cortisol group than in the other groups from 3 to 48 h. These results indicated that both cortisol and red light-emitting diode (LED) light increased GnIH expression and inhibited GnRH expression. In particular, red light irradiation suppressed reproductive responses as much as the cortisol treatment at 48 h. Thus, it could be an alternative method for suppressing reproductive responses in future aquacultures.
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Data Availability
The datasets and materials used during the current study are available from the corresponding author on reasonable request.
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This work was supported by a grant from the National Research Foundation of Korea (NRF) (2018R1A2B6002569).
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Jin Ah Song: Data curation, writing—original draft.
Heung-Sik Park, Young-Su Park: Conceptualization, data curation, formal analysis, review and editing.
Kang Hee Kho: Project administration, conceptualization, data curation, writing—editing.
Cheol Young Choi: Funding acquisition, project administration, writing—review and editing.
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Song, J.A., Park, HS., Park, YS. et al. Exogenous cortisol and red light irradiation affect reproductive parameters in the goldfish Carassius auratus. Fish Physiol Biochem 47, 1711–1724 (2021). https://doi.org/10.1007/s10695-021-01013-9
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DOI: https://doi.org/10.1007/s10695-021-01013-9