B. Zhang, Z. Shang, J. Sun, P. Sorgeloos Temperature, salinity and food are important factors to effect the formation of rotifer resting eggs. Significant higher number of resting eggs and density of male rotifer were found under lower temperature and lower salinity. The number of resting eggs and density of male rotifer in the trial of feeding by Nannochloris sp. were significant higher than in those by yeast. Mass production of resting eggs was conducted in 4 outdoor concrete ponds with a total value of 200m^3. 4.0 X 10^9 resting eggs (1200 grams in dry weight) were produced during 30 days culture. The number of resting eggs produced from 1 gram fresh yeast was 2.0 X 10^4. 90% of resting eggs can be hatched within 30 hours under 28 C in 20 ppt sea water.
(Salt Research Institute, Tianjin, 300450, P. R. China)