Hypophysation is one of the methods for the breeding of fishes.
It employs the injection of the extract of the pituitary gland that induces the breeding in fish.
It also includes the induction of various gonadotrophin hormones in the body which are required for breeding purposes.
The method is quite useful to promote reproduction in fish where spawning conditions are hostile.
Final Answer: Hypophysation is one of the methods of breeding of fishes.
