The annual reproduction cycle in adult carp in Poland : ovarian state and serum gonadotropin level K. BIENIARZ, P. EPLER, B. BRETON and Luong Noc THUYAnn. Biol. anim. Bioch. Biophys., 18 4 (1978) 917-921DOI: https://doi.org/10.1051/rnd:19780525