What is induced breeding of fish or what is hypophysation?

The pituitary gland from a mature fish is collected and homogenized in distilled water. This is then centrifugate’s and a hormone is injected. The extract from this pituitary is then introduced into the body of other fish like carps, which get excited and lay eggs in the pond. In short, it can be addressed as artificially inducing the hormone to help the fish fertilizer is called as induced breeding.