Journal of Neuroendocrinology

News

Ovulation occurs around two hours before lighting (1), and the progesterone and progesterone derivatives interact with receptors in the brain 30 minutes to one hour thereafter (2) leading to sexual receptivity – clasping (3). (Illustration by VESPER STUDIO)
09 Jan 2026
Hiroshima University
A research team led by Hiroshima University and Tokyo University of Agriculture and Technology have proposed a neuroendocrine mechanism in bony fish that signals ovulation from the ovaries to the brain, using the medaka fish as a model; the first step to elucidate the neural circuits for facilitation of sexual receptivity in female teleosts.