This article from the Water Power Technologies Office includes a photograph of Natel's technology and encourages the adoption of turbines that are safe for fish to pass through.
Natel was selected to conduct a design feasibility study to assess the benefits of retrofitting existing turbines at the St. Lawrence-FDR Power Project with FishSafe™ RHTs.
FishSafe™ RHT designs are at the core of two research projects that have been recommended for funding by the U.S. DOE to advance the science required to engineer safer hydropower turbines.