S.H. Cheng, T. Suzaki, A. Hino-1997
Fish. Sci., 63: 543-546, in Rotifer News, 30 (Dec '97)
A heliozoon was isolated from a mass culture tank for rotifers when the production of the rotifer became unstable. When the heliozoon was placed with the rotifer, the rotifer gradually ceased to move, sank to the bottom, and finally died. 24 hours' LC50 for the rotifer was about 10^4 individ./ml. We identified the species as Oxnerella maritima. This is the first record of a heliozoon killing the rotifer Brachionus rotundiformis.
(Univ. Tokyo, Fac. Agr., Fisheries Lab., Maisaka, Shizuoka 43102, Japan)