An Uninfected and Infected Water Flea (IMAGE) Indiana University Caption An uninfected water flea (top right) and an infected water flea (lower left). IU researchers studied the effect of temperature on the infection of water fleas, or Daphnia, by the fungal pathogen Metschnikowia. Credit Meghan Duffy, University of Michigan Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.