Effects of photoperiod and temperature on plasma gonadotropin and spermatogenesis in the rainbow trout Salmo gairdnerii Richardson B. BRETON, R. BILLARD, Pierrette REINAUD and Anne-Marie ESCAFFREAnn. Biol. anim. Bioch. Biophys., 17 3A (1977) 331-340DOI: https://doi.org/10.1051/rnd:19770308