On the pituitary gland and reproductive cycle of Indian fresh water goby, Glossogobius giuris (Ham.) II. Seasonal changes in the proximal pars distalis and their correlation with the reproductive cycle.

The cells of pars-intermedia and rostal pars distalis in the pituitary gland of Glossogobius giuris (Ham.) do not exhibit marked cytological variations. The Basophil I (gonadotrope) of the proximal pars distalis are found to show prominent organisational changes in respect of various gonadal activities and water temperature. The process of granulation and degranulation in these basophils closely follow the process of maturation of the gonads and spawning of the fish. The release of hormones as evinced by the process of degranulation of the basophils during the spawning period (June to September) results in the evacuation of the gonads.