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Fig. 6 A model summarizing the two suggested regulatory axes controlling fish reproduction. The satiety-regulated cholecystokinin (CCK) neurons activate follicle-stimulating hormone (FSH) cells. luteinizing hormone (LH) cells are directly regulated by gonadotropin-releasing hormone GnRH neurons that are gated by CCK, photoperiod, temperature, and behaviour, eventually leading to final maturation and ovulation. Bottom image schematically represents the relative timescale of the two processes and the associated gonadotropin levels. Created with BioRender.com/q88k105.
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