Bacteria-free salmon fry (IMAGE) Norwegian University of Science and Technology Caption Researchers at the Norwegian University of Science and Technology (NTNU) have been able to keep salmon fry bacteria free for as long as 12 weeks after they have hatched. These bacteria-free fry help researchers understand how bacteria affect young fish, with the goal of helping farmed fish to be healthier. Credit Alexander Fiedler, NTNU Usage Restrictions Only in conjunction with articles about this research and with proper credit. License Original 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.