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Immunocytochemical studies of the gonadotropic cells in the pituitary gland of male mullet, Mugil cephalus , during the annual reproductive cycle in both natural habitat and captivity
Author(s) -
Mousa M. A.,
Mousa S. A.
Publication year - 2000
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1046/j.1439-0426.2000.00226.x
Subject(s) - biology , gonadosomatic index , endocrinology , medicine , mugil , captivity , vitellogenesis , sexual maturity , anolis , reproductive cycle , zoology , reproduction , ecology , fishery , fish <actinopterygii> , population , fecundity , oocyte , lizard , embryo , demography , sociology
Summary Using antiserum specific for the β subunit of coho salmon gonadotropic hormone II (GTH II), an immunocytochemical study of Mugil cephalus (L.) pituitaries was conducted during the annual reproductive cycle of the male in both natural habitat and captivity. The gonadotropic potency of the pituitary gland in general underwent an obvious increase during testicular development, reaching a peak at the time of reproductive maturity. During the testicular cycle of M. cephalus , the GTH cells showed an increase in immunoreactive staining intensity, granulation, hypertrophy and hyperplasia during sexual maturation. However, degranulation, vacuolization, and weakened immunoreactivity of these cells occurred during spawning. The GTH cells in the pituitary gland of M. cephalus males reared in captivity appeared with high synthetic and secretory activity but the reproductive activity declined, as reflected in the form of low values of the gonadosomatic index (GSI) and earlier resorption of the testes.