The influence of immature gonads on onset of gonadotropic hormone accumulation in the juvenile rainbow trout pituitary gland
In: General and Comparative Endocrinology, Jg. 48 (1982-10-01), S. 161-166
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Zugriff:
International audience; Juvenile rainbow trout received gonadotropic hormone (GtH) treatment to investigate the response of the immature gonad and its effect on the onset of rising pituitary GtH levels, an early sign of initiation of sexual maturation in the teleost fishes. Brief exposure to GtH evoked increases in plasma androgens and significantly increased pituitary GtH in males; the accumulation of pituitary GtH was not observed in female trout which showed significant but smaller increases in plasma androgen resulting from GtH administration. There was no evidence of gonadal negative feedback in intact immature fish since pituitary GtH and plasma androgens remained at basal levels in castrate juvenile trout. Since the castrate male trout failed to respond to GtH injections, the data suggest that the immature gonad produces a steroid capable of triggering pituitary GtH production by hypothalmo-pituitary feedback in males.
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The influence of immature gonads on onset of gonadotropic hormone accumulation in the juvenile rainbow trout pituitary gland
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Autor/in / Beteiligte Person: | Genge, P.D. ; Idler, David R. ; Billard, R. ; Crim, L.W. ; Marine Sciences Research Laboratory ; Memorial University of Newfoundland [St. John's] ; Laboratoire de physiologie des poissons ; Institut National de la Recherche Agronomique (INRA) |
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Zeitschrift: | General and Comparative Endocrinology, Jg. 48 (1982-10-01), S. 161-166 |
Veröffentlichung: | Elsevier BV, 1982 |
Medientyp: | unknown |
ISSN: | 0016-6480 (print) ; 1095-6840 (print) |
DOI: | 10.1016/0016-6480(82)90013-2 |
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