Sterling summarizes Natel's fish passage research and emphasizes how the RHT can positively impact fish inthe St. Croix and St. Lawrence watersheds.
https://www.ijc.org/en/dam-turbine-design-helps-fish-move-safely-downstream
Natel/PNNL test of 186 rainbow trout measuring up to 500 mm indicated that the RHT allows safe passage.