Medaka (1 of 3) (IMAGE) NASA/Johnson Space Center Caption JAXA astronaut Akihiko Hoshide at the Aquatic Habitat in the Kibo module of the International Space Station, where Medaka fish were reared for an experiment on the loss of bone density in space. Credit NASA 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.