[Radioimmunoassay of hormonal activity of Gobius niger L. testicular interstitial tissue in organ culture: spontaneous activity and stimulation by pituitary gland].

After the interstitial tissue was cultivated, the radio-immunoassay revealed in the media very small quantities of free testosterone but much larger quantities of testosterone conjugates as glucuronids and sulfates. Association of pituitaries increases greatly the secretion. 12-13 days precultivated pituitaires retain close to 70% of their stimulating potency.