Somewhere in the Netherlands, right now, a person you will never meet is staring at a slightly murky underwater video feed, waiting. They’re waiting for a fish. When one swims into frame — a pike, maybe, or a fat silvery bream — they will click a button on a website. And that click, joined by thousands of others, will eventually help open an old canal lock and let that fish continue a journey it has been trying to make since the 1600s. 🐟
This is the visdeurbel — the fish doorbell — and it is possibly the most wholesome job the internet has ever been given.
A traffic jam of fish
Every spring, fish in Utrecht’s canals do what fish have always done: they swim upstream to reach warmer, plant-filled shallows where they can spawn. To get there they have to pass through the Weerdsluis, a lock on the Oudegracht — the historic canal that runs through the heart of the city.
Here’s the snag. A lock is a gated chamber that lets boats step up or down between water levels, and it only opens when a boat needs through. In early spring, hardly any boats are out. So the gates stay shut for days on end — and the fish just… pile up. They gather below the closed lock in a restless crowd, unable to get upstream, waiting for a door that isn’t going to open on its own.
And a crowd of stuck fish is a buffet. Herons, cormorants and bigger fish know exactly where to find an easy meal. Every day the fish spend queuing at the gate is a day they’re exposed, tired, and in danger before they’ve even reached the place they’re trying to raise the next generation.
Enter the doorbell
The classic engineering fix for this is a fish ladder — a stepped concrete channel that lets fish climb past an obstacle. They work, but they’re expensive and involved, and the Weerdsluis is a beloved historic structure in the middle of a UNESCO-adjacent old town. So Utrecht tried something gentler and much stranger instead.
They dropped an underwater camera by the lock gate and pointed it at the waiting fish. Then they put that live video on a public website, next to a big friendly button. The deal is beautifully simple: you watch the feed, and when you see a fish, you press the doorbell. 🔔
There’s an honest little detail worth knowing, because it makes the whole thing even nicer rather than less magical: your press doesn’t instantly heave the gate open. Each ring quietly saves a screenshot into a database that the city’s ecologists check. When the footage shows that enough fish have gathered, the lock keeper opens the gates on purpose — so the fish stream through into the calm water beyond, all at once, and carry on upstream. You’re not operating the lock by remote control. You’re the lookout. You’re the one who noticed. And thousands of strangers are keeping watch alongside you.
The world showed up
When the fish doorbell first went live in March 2021, nobody quite expected what happened next. People didn’t just try it — they stayed. In the first two weeks alone, the button was pressed around 23,000 times. Word spread across the planet, and soon there were people in other time zones setting alarms, keeping the feed open in a browser tab all day, quietly volunteering as fish lookouts for a canal they had never seen in a city many of them would never visit.
The fish, it turns out, aren’t the only regulars. Because the camera runs day and night through the season, viewers have spotted all sorts of guests drifting past the lens: crabs picking their way along the bottom, frogs, and every so often a goose paddling by looking thoroughly unbothered. It became a tiny, ever-changing window into a slice of underwater Utrecht that no one had ever really watched before.
Off in summer, back every spring
The doorbell keeps honest hours. It only runs during the spring migration, when the fish actually need it — it switched off on 1 July 2024 once the season’s travellers had made it through, and came back on 3 March 2025 for the next spring. It’s become a small annual ritual: every year, when the water warms and the fish start gathering, the camera blinks back on and the world’s lookouts return to their posts. The idea has charmed enough people that it even turned up on Last Week Tonight with John Oliver, complete with a song about it. 📺
Why this is on a good-news blog
Because it’s such a clear-eyed, good-hearted little idea. Somebody looked at a genuinely tricky problem — fish stuck at a historic lock, too costly to solve with concrete — and thought: what if we just… asked people to help watch? And then people did. Not for a prize, not for points, not for anything but the quiet satisfaction of pressing a button and knowing that somewhere a real fish, a real living thing on a real journey, got a little help getting home.
There’s a whole internet full of people, it turns out, who will happily spend their afternoon watching a murky patch of canal on the off-chance they can be the one to spot a bream and ring a bell for it. Given the single most wholesome job available, an awful lot of us said yes, please, put me on fish watch. The world does that kind of thing more often than you’d think. 🐟💛
Want to take a shift on the lookout? The doorbell lives at visdeurbel.nl each spring. Seen something wonderful in your own corner of the world? Sign the guestbook and tell us.
