Hypophysation includes the extraction of hormones from the pituitary glands of donor fishes and injecting the same to Carps in captivity, i.e., either in hatchery or ponds.
Advantages:
(i) Carps breed in rivers and not in captivity. By hypophysation, Carps can be made to breed in captivity.
(ii) We get healthy and pure seeds for fish farming, which ensures the supply of the same in desired quantity.