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Vacuum tube shoots salmon over dams

Biologists in central Washington were concerned about humanmade dams blocking salmon and other fish from their natural habitats. So Whooshh Innovations adapted a vacuum-pressurized tube system for fish travel, using the pressure difference created when the tube’s flexible membrane molds to the fish. With the fish’s body acting as a seal, the fish zips from an area of high pressure behind it into the low-pressure area ahead. Yakama Nation Fisheries staff members tested the system in early June by safely transporting 90 fish from a collection area inside a building to a tanker truck outside, High Country News reports.

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