Profiles of plasma gonadotropin and 17 beta-estradiol in the common carp, Cyprinus carpio L., as related to spawning induced by hypophysation or LH-RH treatment.
Plasma gonadotropin (GTH) and 17 beta-estradiol (17 beta-E2) levels and oocyte stage have been studied in the common carp, Cypinus carpio L., after classical "hypophysation" (two intraperitoneal pituitary injections of 0.3 mg/kg and 2.7 mg/kg at a 12-hr interval) or LH-RH treatment (two intracardiac injections of 3 micrograms/kg at a 3-hr interval). After the first pituitary injection of LH-RH treatment, GTH increase was followed by a significant increase of 17 beta-E2 7 hrs after the injection. The higher GTH levels after the second pituitary injection did not increase that secretion. After classical "hypophysation", one-half 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.
D000818:Animals; D002347:Carps / Q000502:physiology*; D003530:Cyprinidae / Q000502:physiology*; D004958:Estradiol / Q000097:blood*; D005260:Female; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology*; D006065:Gonadotropins, Pituitary / Q000097:blood*; D007700:Kinetics; D009865:Oocytes / Q000187:drug effects; D010058:Oviposition / Q000187:drug effects*; D010902:Pituitary Gland / Q000502:physiology*; D014020:Tissue Extracts / Q000494:pharmacology
D006065:Gonadotropins, Pituitary; D014020:Tissue Extracts; D007987:Gonadotropin-Releasing Hormone; D004958:Estradiol