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.
Journalist Lela Nargi interviewed both Gia and Abe Schneider for this piece about the value and need for through-turbine fish passage.
Gia talks about retrofitting existing hydro units, adding generation to non-powered dams, and installing the RHT in Africa in collaboration with MyHydro on POWER Magazine's podcast.