Morpho-histology of the hypothalamo-neurohypophyseal system in relation to gonadal maturation in Cirrhinus mrigala (Ham.), a freshwater Indian carp.

The hypothalamic neurosecretory centres, their pathway and the role of neurosecretory material responsible for gonadal maturation during its annual cycle is being reported here for the first time in an Indian freshwater major carp, Cirrhinus mrigala (Ham.).