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Neural progesterone receptors link ovulation and sexual receptivity in medaka

Researchers demonstrated that neural progesterone receptors signal ovulation timing to the brain, increasing female medaka sexual receptivity in sync with their ovulatory cycle.

Summary by Phys.org
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.

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Phys.org broke the news in United Kingdom on Friday, January 9, 2026.
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