Brain-Pituitary-Gonadal Axis: GnRH, Gonadotropins (FSH, LH), Kisspeptin and Pineal Photoperiodic Transduction

• The Nagoya Protocol:
• Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from their Utilization (ABS): A supplementary agreement to the Convention on Biological Diversity (CBD).
• Adopted on 29 October 2010 in Nagoya, Japan, and officially entered into force on 12 October 2014 after reaching the 50th instrument of ratification.
• Correct Option: Option 4 (2014).

• Pituitary Regulation of Oocyte Maturation:
• In teleosts, Final Oocyte Maturation (FOM) and ovulation are driven by the pre-ovulatory surge of Luteinizing Hormone (LH) secreted by pituitary gonadotropes.
• LH acts on ovarian follicular cells to stimulate synthesis of the Maturation-Inducing Hormone (MIH, typically $17\alpha,20\beta$-dihydroxy-4-pregnen-3-one / $17\alpha,20\beta$-DHP), which activates Maturation-Promoting Factor (MPF) to trigger germinal vesicle breakdown (GVBD).
• Correct Option: Option 1 (Luteinising hormone).

• Pineal Gland Localization:
• In teleost fishes, the pineal organ (epiphysis cerebri) is a photosensitive neuroendocrine structure situated on the dorsal roof (epithalamus) of the diencephalon (forebrain).
• It detects ambient light levels through a translucent window in the skull (pineal window) and synthesizes melatonin in a circadian rhythm to synchronize diurnal behavior, seasonal reproduction, and smoltification.
• nalysis:
• (Diencephalon): Correct.

Correct option: (1) Diencephalon