Slow Motion Video Below a Glass Knifefish (VIDEO) New Jersey Institute of Technology This video is under embargo. Please login to access this video. Caption Purple and mustard dots mark the peaks and troughs of traveling waves of the ribbon fin from the tail and head, respectively. The blue arrow y(t) is the movement of the fish and green arrow u(t) is the movement of the nodal point where the two traveling waves meet. Credit NJIT/JHU Usage Restrictions Credit: NJIT/JHU 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.