Salmon are amazing fish. They’ll swim hundreds of miles against the current, hurl themselves up waterfalls, and risk being eaten by bears as they return to their birthplace to spawn. But some obstacles are too much, and that’s where Whooshh Innovations comes in. Behold, the salmon cannon. Seriously, watch this video of fish getting launched out of pneumatic tubes:
So they put a tilapia into the fruit tube and let it fly, proving both fish and fruit are subject to Bernoulli's laws. Whooshh is aware of the giggle factor here. To quote Todd Deligan, Whooshh's vice president:
Whooshh Innovations ("Whoosh" was already taken) first designed its tubes to transport fruit, but as Washington state debated what do about hydroelectric dams and the salmon whose migrations they blocked, the company saw its technology might have another purpose. If Whooshh tubes could send apples flying over long distances without damaging them, maybe, an employee thought, they could suck fish up and over the dams blocking the Columbia river.
"At a talk at the National Hydropower Association, I hit play on the video and the first fish goes flying out, and the audience is dying. I had to say, 'It's okay to laugh, this is utterly ridiculous.' Then people start talking and they say, 'Holy cow, why hadn't we thought of something like this before?'"The salmon cannon isn't fully operational, but they have tested it by destroying Alderan, a small planet on the edges of the empire ... no, sorry ... they've tested it a couple of times in the Columbia River system.
The test in June showed that fish will voluntarily enter the tube. When they swim into the entrance, the vacuum sucks them in and gives them initial boost; after that, elevated pressure behind the fish keeps them moving at about 15 to 22 miles per hour till they go flying out the other end. The speed, Deligan says, can be adjusted. Mist is applied to keep the fish wet as they zoom along. Currently the tubes are being hand-loaded, but Deligan says the test at the Roza site showed that "the fish just swim right in."More tests are planned, but unless something bad shows up, it looks like someday you might see salmon flying to get around dams. Without chartering airplanes.