Feed additive for fishdiet with antioxidant and immunostimulating effect Sergey Ponomarev, Olga Levina, Yulia Fedorovykh, Aliya Akhmedzhanova, Alexey Nikiforov-Nikishin and Victor Klimov E3S Web Conf., 363 (2022) 03036 Published online: 14 December 2022 DOI: 10.1051/e3sconf/202236303036