What is the meaning of Hypophysation?

Hypophysation:

1. Hypophysation is a process in which ripe fish brooders are induced to breed in captivity using pituitary hormones.
2. Extracts of pituitary glands are injected into fishes that enable them to breed.
3. Hormones such as gonadotropins are employed in the process.
4. The method is useful to promote reproduction in fish where spawning conditions are not favourable