Vibration Attraction Behavior in Cavefish (video) University of Maryland Loading video... Caption A cavefish (left) and surface fish (right) swimming in assay chambers in the presence of a 50 Hz vibrating rod. When the rod is vibrated, the cavefish, but not surface fish, were strongly attracted. Credit Masato Yoshizawa Usage Restrictions Credit: University of Maryland, Masato Yoshizawa. 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.