An extract of the radial nerves of the starfish, Asterias amurensis, acts on the ovary in two ways: it induces meiosis and brings on spawning. Contraction of the gonadal wall, the, driving force for spawning, does not happen until this gamete-shedding substance acts to liberate the eggs that adhere to each other or to the inner surface of the gonadal wall.
No takes yet. Share an insight, caveat, or question.
Haruo Kanatani (1964) studied this question.