Profiles of plasma gonadotropin and 17β-estradiol in the common carp, Cyprinus carpio L., as related to spawning induced by hypophysation or LH-RH treatment
1980
WEIL, Claudine | Fostier, Alexis | Horvath, L. | MARLOT, Sylviane | BERSCENYI, M.
Plasma gonadotropin (GTH) and 17β-estradiol (17β-E2 ) levels and oocyte stage were studied in C. carpio after classical hypophysation (two intraperitoneal pituitary injections of 0.3 mg/kg and 2.7 mg/kg at a 12-h interval) or LH-RH treatment (two intracardiac injections of 3μg/kg at a 3-h interval). After the first pituitary injection of LH-RH treatment, GTH increase was followed by a significant increase of 17β-E2 7 h after the injection. The higher GTH levels after the second pituitary injection did not increase that secretion. After classical hypophysation, 50% of the females ovulated. There was no difference between spawning and non-spawning fishes in relation to hormonal parameters. LH-RH treatment only induced a shifting of the nucleus.
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