Abstract
SUMMARY.The diet and feeding habits of natural and cultured populations ofMesocyclops leuckartiwere studied. Nauplii and copepodid stages I–III are herbivorous. Copepodid stages IV–V and adults preferentially preyed uponCeriodaphniaandDiaphanosomawhereasBosminawas not preyed upon. Rate of predation onCeriodaphniaand newbornArtemianauplii was higher between 15–22°C than between 22–27°C. Under starvation conditions, the survival time for males was shorter than for females.