Effects of food concentration on population growth, body size, and egg size of the freshwater rotifer Brachionus angularis Effect of temperature and food concentration on the population dynamics of three Brachionus calyciflorus strains A comparative study on effects of three freshwater algae species on rotifer Brachionus calyciflorus cultivation Effects of food concentration on the duration of reproductive period and the formation of mictic female in different strains of freshwater rotifer Brachionus calyciflorus Effects of microalgal species and concentrations on the feeding and digestive enzyme activities of Calanus sinicus