Dutch 'Fish Doorbell' Turns Into Unlikely Online Hit Combining Slow TV, Ecology

Undated photo of a  perch fish at a river lock in the central Dutch city of Utrecht, Netherlands, where a "fish doorbell" was installed that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds. (Visdeurbel via AP)
Undated photo of a perch fish at a river lock in the central Dutch city of Utrecht, Netherlands, where a "fish doorbell" was installed that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds. (Visdeurbel via AP)
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Dutch 'Fish Doorbell' Turns Into Unlikely Online Hit Combining Slow TV, Ecology

Undated photo of a  perch fish at a river lock in the central Dutch city of Utrecht, Netherlands, where a "fish doorbell" was installed that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds. (Visdeurbel via AP)
Undated photo of a perch fish at a river lock in the central Dutch city of Utrecht, Netherlands, where a "fish doorbell" was installed that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds. (Visdeurbel via AP)

The central Dutch city of Utrecht has installed a “fish doorbell” on a river lock that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds.
The idea is simple: An underwater camera at Utrecht's Weerdsluis lock sends live footage to a website. When somebody watching the site sees a fish, they can click a button that sends a screenshot to organizers. When they see enough fish, they alert a water worker who opens the lock to let the fish swim through, The Associated Press reported.
Now in its fifth year, the site has attracted millions of viewers from around the world with its quirky mix of slow TV and ecological activism.
Much of the time, the screen is just a murky green with occasional bubbles, but sometimes a fish swims past. As the water warms up, more fish show up.
Without the help, native freshwater fish like bream, pike and bass can become backed up behind the lock and form easy prey for predators in the spring, when the lock is rarely opened for passing boats.
The bell is the brainchild of ecologist and concept developer Mark van Heukelum. He's been happily surprised at the response, with millions of people from around the world tuning in over the years.
“I guess the combination of a good cause, a beautiful story and just a simple idea generates all this attention," he said.
Anna Nijs, an ecologist with Utrecht municipality, was also amazed at the popularity of the concept around the world.
“We get a lot of fan mail from people who think it’s slow TV and they find it relaxing," said Nijs. Besides, “they appreciate that they can actually do something to help.”



Injured Seals Get Care and Sanctuary at a New Center in the Netherlands 

A seal swims in a tank at the new seal sanctuary in Lauwersoog, northern Netherlands, Thursday, April 24, 2025. (AP)
A seal swims in a tank at the new seal sanctuary in Lauwersoog, northern Netherlands, Thursday, April 24, 2025. (AP)
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Injured Seals Get Care and Sanctuary at a New Center in the Netherlands 

A seal swims in a tank at the new seal sanctuary in Lauwersoog, northern Netherlands, Thursday, April 24, 2025. (AP)
A seal swims in a tank at the new seal sanctuary in Lauwersoog, northern Netherlands, Thursday, April 24, 2025. (AP)

Gliding gracefully through the waters at his new home, Witje pauses briefly to peer through a large window at the curious and admiring visitors.

The 4-month-old gray seal is a lucky survivor able to swim in one of nine new tanks at the World Heritage Center, or WEC, a recently opened seal rescue facility in Lauwersoog, in the north of the Netherlands.

He was brought in after being orphaned and was suffering from a swollen flipper and a damaged eye.

“On a yearly basis, we roughly treat about 200 seals,” Sander van Dijk, the curator of the center, told The Associated Press. In 2024, researchers at Wageningen University in the Netherlands counted around 24,000 seals across the Wadden Sea.

Most are pups who get separated from their mother, known as howlers for their plaintive wailing. Others are injured by floating debris or are struck by passing vessels.

“If we look at our own data over the past 15 years, we just see every year more seals that somehow get entangled in waste in the sea, mostly fishing nets,” Van Dijk said.

The WEC, which officially opened to the public Saturday, replaces the Pieterburen Seal Center, a rescue facility set up in 1971 to treat injured seals found in and around the nearby Wadden Sea, which is a UNESCO World Heritage Site.

Witje’s tank is an upgrade from his previous quarters. He gets to swim in water directly from the sea, rather than tap water, in order to maintain a habitat as close as possible to the seals’ natural environment.

“They are adapted to living in seawater. It’s good for their fur. But also seawater, through its salt, has some properties that makes wounds heal faster,” Van Dijk said.

The WEC can treat around 70 seals at a time and has 12 intensive-care units for animals with serious injuries who are able to recover in special enclosures which offer a calm environment. They are prevented from swimming in order to rest and the space is cleaned frequently to prevent infections from waste.

The new building, which cost over 40 million euros ($45 million), with financing provided by local and regional governments as well as charitable organizations, tells more than just the story of the seas. It’s an educational space which teaches visitors about the Wadden Sea, the largest continuous system of intertidal flats in the world, extending along the coasts of the Netherlands, Germany and Denmark.

The new facility is significantly closer to the sea than the previous location. The tanks for the 10 seals currently residing at WEC look out over the water. Caregivers at the center are optimistic that Witje will soon recover enough to be released back into the waves.