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Effects of the androgen preparation "Testoenatum" on reproductive function in males of Atlantic salmon and several species of whitefish

Published online by Cambridge University Press:  15 January 1996

Oleg L. Christoforov  and
Irene G. Murza
Oleg L. Christoforov
Affiliation:
Department of Evolutional Physiology, Institute of Physiology, Sankt-Petersburg State University, 7/9 University Embankment, Sankt-Petersburg, 199034, Russia
Irene G. Murza
Affiliation:
Salmonid Fish Laboratory, State Research Institute on Lake and River Fisheries (GosNIORCh), 26 Makarou Embankment, Sankt-Petersburg, 199053, Russia
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Abstract

Atlantic salmon, Salmo salar, and several species of whitefish, Coregonus nasus, C. peled, C. Lavaretus baeri, males were treated with a long-acting medical androgen preparation - "Testoenatum". This preparation contains 24 mg of testosterone enanthate and 111 mg of testosterone propionate in 1 ml peach oil solution. Multiple (2–5) or single intraperitoneal injections of a standard dose (0.1 ml/kg fish body weight) were used. Treatment performed shortly before the beginning or within the breeding season resulted in a significant stimulation of spermiation, improvement of sperm parameters and extention of the gonad functional maturity period for 1–4 months. Low water temperatures (0.5–l.0 °C) seem to be essential to obtain a long-lasting effect after one injection. The histology of the pituitary gland suggests that the gonadotropic cells were activated through a positive feedback mechanism. Testoenatum suppressed Sertoli cells' phagocytary activity.

Keywords

Salmo salarwhitefishspermtestosteronefunctional maturity periodSertoli cellsSalmo salarcorégonesspermetestostéronematurité sexuellecellules de Sertoli
Type
Research Article
Information
Aquatic Living Resources , Volume 9 , Issue 1 , January 1996 , pp. 31 - 41
Copyright
© IFREMER-Gauthier-Villars, 1996

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