Dezeen Magazine

Whooshh Passage Portal fish tube

Whooshh Passage Portal uses AI to shoot fish through a tube over dams

Fish with migration paths blocked by a dam can be shot over the top via the Whooshh Passage Portal technology after being sorted by artificial intelligence.

Whooshh Innovations is a Seattle-based company that is developing better technology to help fish migrate over dams. The Whooshh Passage Portal is their latest all-in-one system for fish passage.

Dams block rivers to create hydropower, which is a source of sustainable energy, but they stop fish being able to swim back upstream to where they spawned in order to reproduce.

Whooshh Passage Portal fish tube
The tube system can help fish pass over the dams blocking migration paths

"New ways of thinking are needed for this problem," Mike Messina, a director at Whooshh Innovations, told Dezeen.

"Where we have seen so many other fields benefit from clever design and technological innovation, when it comes to fish passage the technology has remained the same for 60 years."

The modular, portable system offers a faster and less arduous alternative to fish ladders or fish being transported in tanks by trucks or helicopters.

Fish swim into the system mounted on a floating pontoon via a ramp, which then slides them back down into a scanner.

The scanning machine takes 18 rapid-fire images, measuring the length and girth of each fish to determine whether they are from a hatchery or wild, or even an invasive species.

The artificial intelligence (AI) sorts the fish accordingly, with invasive species released, and the remaining fish routed according to their size.

Whooshh Passage Portal fish tube
Fish swim up a ramp into the passage system

Using AI means the system's scanning and sorting algorithms can be improved and updated easily, and the fish don't need to be handled by humans.

Corralled into a plastic tube, differential pressure is used to push the fish gently but quickly up the tube and over to the water on the other side where they are deposited into the stream.

"The soft flexible tube is misted every 1.5 metres," said Messina. "The mist is important so that the fish can glide, still exchange oxygen through it’s gills, and have the colder water they typically seek."

Whooshh Passage Portal fish tube
AI is used to scan and sort the fish

Depending on the length of the tube the journey takes around 10 to 20 seconds.

"The fish benefit because they are not stressed, and because they are handled gently and safely," said Messina.

"It is important to recognise that they are on a migratory journey to spawn. For a fish carrying anywhere from 3000 to 5000 eggs, a gentle ten-second glide is far superior to a day straining to climb a concrete fish ladder or being handled by humans to be transferred into a truck."

Whooshh Passage Portal fish tube
Differential pressure is used to shoot the fish through a soft plastic tube

Fish ladders are a long and arduous journey for fish, who navigate by seeking colder water and can become confused and vulnerable to predators.

The Whooshh Passage Portal is also more sustainable in terms of water use.

"Our systems use very little water. Fish ladders require five to 10 per cent of a river's flow to go down them at all times," explained Messina.

"Using Whooshh, that five to 10 per cent can now be redirected to more irrigation, or to increased carbon-free hydropower production," he continued.

"It's like adding a turbocharger to an already-existing engine – you're able to squeeze a bit more power out of what you already have."

Whooshh Passage Portal fish tube
The system is modular and portable, and could be used to address changing water levels

In the future the system could also be applied to situations where climate change affects water levels and hinders fish migration.

"Technology is available to really make a difference in bringing benefit to nature," said Messina.

In Bermuda, a team of scientists are using an undersea robot to catch lionfish, which are an invasive species that threatens the local marine life.

Images courtesy of Whooshh Innovations.