Papoyan G. K. RussiaMoscowLomonosov Moscow State University, 1-12 Leninskie Gory, Moscow 119234, Russiageva1391@mail.ru Author's articles EFFECT OF A LOW-INTENSITY 30 MHz ELECTROMAGNETIC FIELD ON DAPHNIA MAGNA STRAUS (DAPHNIIDAE, CRUSTACEA) CRUSTACEANS OF VARIOUS AGES