For the fifth year, Utrecht’s fish doorbell is live, helping fish migrate through the Weerdsluis lock. This clever initiative, launched on March 3, uses a live-stream camera to let the public assist fish in their journey.
Every spring, thousands of fish—like bream, pike, and bass—swim from the River Vecht to the River Kromme to spawn. But obstacles like sluices and dams can block their way, leaving them stranded and vulnerable. That’s where the fish doorbell comes in. Developed by two ecologists, it allows viewers to alert the lock keeper when fish are waiting, prompting the gate to open.
It’s simple: watch the live stream, click the doorbell when you see a fish, and snap a picture. The lock keeper then reviews the images and decides when to open the gate. Last year, nearly three million people tuned in, ringing the doorbell over 40,000 times! The footage also helps scientists track fish migration and water quality.
Though a Dutch invention, the fish doorbell has gone global. Fans from the U.S., Brazil, and New Zealand eagerly participate each year between March and May. Social media buzzes with excitement, and some enthusiasts even send letters of appreciation.
Beyond the fun, this project highlights how technology and citizen science can support conservation. Fish play a crucial role in maintaining water quality, and their presence signals a healthy ecosystem.
Curious? Try it yourself! Watch the stream, spot a fish, and ring the bell at www.visdeurbel.nl/en. Who knew helping fish could be this entertaining?
