Study of the use of biologically active additives in the cultivation of amber trout Denis Yurin, Ekaterina Maksim, Alexandra Skamarokhova, Aleksandra Danilova and Andrey Svistunov BIO Web Conf., 82 (2024) 03002 Published online: 03 January 2024 DOI: 10.1051/bioconf/20248203002