Developed and patented by Normandeau Associates, Inc, the HI-Z Turb'N Tag® (HI-Z Tag) provides an innovative, efficient method to quantify turbine, spillway and natural falls fish passage survival. This unique methodology has led to the reevaluation of spillways and other passage routes, and to develop fish-friendlier bypass structures worldwide.
For decades, fisheries scientists have worked to obtain reliable survival estimates of fish as they exit through turbines and other passage routes at hydroelectric facilities. Reliability of this information is of paramount importance for project owners and state and Federal agencies trying to determine the safest routes for downstream fish passage. This is especially true for migratory fishes, which must travel downstream through hydroelectric installations in order to complete their life cycle.