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Earth Transportation United States Science

Researchers Build American Eels an 'Eelevator' (upi.com) 52

randomErr writes: Bad pun aside, Cornell researchers have built a solution to help migrating eels bypass dams on their journey upstream. They call their solution the "eelevator." "Dams are one of the main impediments to the recovery of American eels," reports UPI. "The removal of old dams has proven a boon to the endangered species, but many dams remain and not all can be demolished. [...] Eel ladders have been installed along a number of dams, but the newest device is liftable and works with the assistance of human volunteers. Eels looking to move upstream can climb a ramp of netting, kept wet by hoses, into a holding tank of circulating water. Twice a week, volunteers can check to see if eels have arrived. The tank can be raised, like an elevator, and the water deposited into the river above the dam." This is similar to a concept implemented by the Isle of Wight's Island Roads, Environment Agency, Arc Consulting, and Artecology back in May.
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Researchers Build American Eels an 'Eelevator'

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  • by Anonymous Coward

    I bet that was the only reason they did it :)

  • by pjabardo ( 977600 ) on Tuesday July 04, 2017 @06:02AM (#54740985)
    Interesting and important project but such elevators have been built in dams all over the world, perhaps not for eels specifically. I have personally seen one in Brazil and know of others. Some species of fish can't or won't use ladders. Biologists also get to count and measure the species going up the elevator. I guess that accurate measurement of migration of several species is a very difficult process. I have no idea how effective these elevators are.
  • by Anonymous Coward on Tuesday July 04, 2017 @06:05AM (#54740989)

    Not as good as the salmon cannon. [google.co.uk]

    • I'm skeptical that that would work. The slime layer on a fish doesn't just make them harder for predators to grip. It acts as a biological shield, helping block bacteria and parasites from reaching the skin. A long slide through a tube will strip away some or most of that layer, making the fish more likely to die.

      That might not be a problem for salmon, which will die anyway after they finish their journey upstream and spawn. But eels are the opposite of salmon - they go to sea to spawn. The young li
  • Twice a week, volunteers can check to see if eels have arrived.

    Meanwhile there are companies trying to create self driving cars on city streets. These guys would not think of creating an eel sensor using 5$ chips and automating it.

    Why lift the entire holding tank? One can design something similar to the Dyson bladeless fan or design a series of holding tanks, air pumps etc and let the eels swim upstream,.

    Well I can understand pure bio students/profs coming up with this idea. Showing to the engg department they might have helped design something simpler and more cost effective.

    • One can design something similar to the Dyson bladeless fan

      the Dyson bladeless fan hides its blades where you can't see them, but it still has them and the air still moves over them. Your proposal is therefore similar to a monty python sketch. This is where the eels pass the rotating knives...

  • At least elevators for eels come cheap, because they bring their own electricity.

  • When the hovercraft fills with eels, it would automatically lift off and transport the next batch.

  • by Rik Sweeney ( 471717 ) on Tuesday July 04, 2017 @08:17AM (#54741317) Homepage

    Containing some uplifting news.

  • This is a bad solution. It would be much better to build a long ramp that the eels can go up rather than depending on human intervention. The eels are quite willing to travel the extra distance.

  • ... a cannon [youtube.com]?

  • It should be automatic (how long will humans pay attention?), and powered by the dam using lo-tech wheel & cogs that won't need maintenance for the life of the dam.

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