Biology:Fish doorbell

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Short description: Crowdsourced fish ladder in the Netherlands


A fish doorbell (Dutch: visdeurbel) is a system that allows fish to pass through a closed sluice gate through crowdsourced input when fish are present. The Utrecht Visdeurbel uses a livestreamed underwater camera that allows users to press a doorbell button to notify the lock operator that there are fish swimming in the gracht, and that the lock should be opened.[1] It is designed to aid in seasonal fish migration,[2] as an alternative to a physical fish ladder. The purpose of the project is to increase the survival of local fish that are otherwise vulnerable to predation during migration. The doorbell does not solely benefit fish. Crabs, lobsters, frogs, and geese have been caught on the livestream.[3]

Usage

It was deployed for the first time in Utrecht in March 2021,[4][5][6][7] at the Weerdsluis on the Oudegracht. In the first two weeks, it was used 23,000 times.[8] It was disabled in June,[9] but was reinstated at https://visdeurbel.nl. It ceased operation on July 1st, 2024 due to concluded migratory patterns and returned on March 3rd, 2025. It repeated this pattern the next year, with its next scheduled opening on March 2nd, 2026. [10]

The system was featured in Episode 8 of Season 12 the American news satire late-night talk show Last Week Tonight with John Oliver. On the show, R&B singer Mario makes a guest appearance and sings a song about the system.[11]

References

  1. ↑ Corbley, Andy (21 April 2021). "Dutch Citizens are Using a "Doorbell" to Help Fish Pass Through the Canal Gate". GoodNewsNetwork. https://www.goodnewsnetwork.org/utrecht-scientists-invent-worlds-first-fish-doorbell/. 
  2. ↑ Visdeurbel. "Over de visdeurbel" (in nl). https://visdeurbel.nl/over-de-visdeurbel/. 
  3. ↑ Visdeurbel. "Over de visdeurbel" (in nl). https://visdeurbel.nl/en/nicest-photos/. 
  4. ↑ "Utrecht krijgt de eerste visdeurbel ter wereld (en dit is geen 1 aprilgrap): 'Bij de sluis ontstaat een vissenfile'". https://www.ad.nl/utrecht/utrecht-krijgt-de-eerste-visdeurbel-ter-wereld-en-dit-is-geen-1-aprilgrap-bij-de-sluis-ontstaat-een-vissenfile~adfd2019/. 
  5. ↑ Hee, Sterre van der (2021-03-29). "Deze visdeurbel moet vissen in Utrecht gaan helpen: 'Mensen en dieren kunnen best wat meer samenleven'" (in nl-NL). https://www.trouw.nl/gs-b20cc1d3. 
  6. ↑ "Utrecht helpt vissen de sluis door: visdeurbel bij Weerdsluis vanaf nu live" (in en-US). 2021-03-29. https://www.duic.nl/algemeen/utrecht-helpt-vissen-de-sluis-door-visdeurbel-bij-weerdsluis-vanaf-nu-live/. 
  7. ↑ "Utrecht heeft eerste visdeurbel ter wereld, vis wacht tot sluis opengaat" (in nl). 2021-03-29. https://www.nu.nl/utrecht/6124784/utrecht-heeft-eerste-visdeurbel-ter-wereld-vis-wacht-tot-sluis-opengaat.html. 
  8. ↑ "Visdeurbel Oudegracht Utrecht ruim 32.000 keer ingedrukt" (in nl). 14 April 2021. https://nos.nl/l/2376672. 
  9. ↑ "Visdeurbel bij Utrechtse sluis komt volgend seizoen weer terug" (in nl). 7 June 2021. https://nos.nl/l/2383971. 
  10. ↑ "Wekdienst 3/3: Hoorzitting over pleegmeisje Vlaardingen • Visdeurbel gaat aan" (in nl). 2025-03-03. https://nos.nl/artikel/2557999-wekdienst-3-3-hoorzitting-over-pleegmeisje-vlaardingen-visdeurbel-gaat-aan. 
  11. ↑ Perkins, Dennis (April 14, 2025). "John Oliver Offers an Antidote to Trump's Fishy Tariffs". https://latenighter.com/news/john-oliver-offers-an-antidote-to-trumps-fishy-tariffs/. 
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