Ultrastructural studies on experimentally induced vitellogenesis in juvenile rainbow trout (Salmo gairdneri R.) S. N. UPADHYAY, B. BRETON and R. BILLARD Ann. Biol. anim. Bioch. Biophys., 18 4 (1978) 1019-1025 DOI: 10.1051/rnd:19780541