A unique conservation project in Utrecht, Netherlands, is attracting millions of global viewers each year.
Dubbed the “fish doorbell,” this innovative initiative allows people to help migrating fish navigate city waterways by watching a livestream and pressing a button when they see fish waiting at a lock. The signal alerts local water authorities to open the lock, giving fish like bream, pike, and bass safe passage to their spawning grounds.
Now in its fifth year, the fish doorbell project has become a surprising internet sensation, combining ecological awareness with the tranquillity of slow TV. The system uses an underwater camera at the Weerdsluis lock in Utrecht.
When viewers spot fish, they click a virtual doorbell, sending a screenshot to local water managers. Once enough fish have been detected, the lock is opened, allowing their migration to continue.
The concept was created by ecologist Mark van Heukelum, who said, “I guess the combination of a good cause, a beautiful story, and just a simple idea generates all this attention.” His aim was to solve the problem of springtime fish migration being blocked by man-made water locks, which often remain closed during spawning season. Fish stuck behind the lock are vulnerable to predators and unable to complete their reproductive journey.
Fellow Utrecht ecologist Anna Nijs highlighted the project’s emotional and mental impact. “We get a lot of fan mail from people who think it’s slow TV and they find it relaxing,” she said. “Besides, they appreciate that they can actually do something to help.”
The fish doorbell has become a model for combining public engagement, environmental stewardship, and digital innovation. It runs annually during spring migration and has sparked interest from other cities considering similar conservation strategies.
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