Plasma 11-oxotestosterone and gonadotropin during the beginning of spermiation in rainbow trout (Salmo gairdneri R.).

Alexis Fostier (1) , Roland Billard (1) , Bernard Breton (1) , M. Legendre (1) , Sylviane Marlot (1)

1 Laboratoire de physiologie des poissons

Radioimmunoassays are used to follow plasma 11-oxotestosterone and glycoprotein gonadotropin levels related to sperm production in male rainbow trout at the onset of spermiation. The 11-oxotestosterone concentrations are higher in the plasma of males giving a measurable volume of sperm. When these levels increase as spermiation progresses, the gonadotropin level tends to decrease slightly. Furthermore, the quantities of collected sperm are positively correlated with the 11-oxotestosterone levels, but not with GTH secretion.

Mots clés: rainbow; rainbow trout; spermatozoa; fish; 11-oxotestosterone; gonadotropin; spermiation; radioimmunoassay; spermatogenesis; salmonids; trout

Mots clés: poisson; salmonidae; truite arc en ciel; oncorhynchus mykiss; salmo gairdneri; spermatozoïde; reproduction; spermatogénèse; gonadotropine; testosterone

Domaines: Sciences du Vivant [q-bio]

Alexis Fostier, Roland Billard, Bernard Breton, M. Legendre, Sylviane Marlot. Plasma 11-oxotestosterone and gonadotropin during the beginning of spermiation in rainbow trout (Salmo gairdneri R.).. General and Comparative Endocrinology, 1982, 46 (4), pp.428-434. ⟨10.1016/0016-6480(82)90096-X⟩. ⟨hal-01600658⟩