This device in its usefulness reminds me the squid gun of the infamous Vector superhero from Despicable Me. Normal people build cascades around dams for salmon. Once built these require zero maintenance.
I think for specific situations this can be useful. In the final video they show a 'holding tank' the salmon eventually get to and are then hand transported through the building to the next body of water.
I think it has been designed for a very specific commercial issue (maximising the restocking of wild salmon). I'm guessing this has applications elsewhere where you want to transport live fish/tubular slimy animals.
