Did you spot a fish? Press the Fish Doorbell!

Then our lock keeper can let the fish through.

Press the Fish Doorbell
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You’re watching the live stream with 11 others

Thanks for ringing the Fish Doorbell!

Spotted a fish? Check the fish below:

⚠️ Are you sure you spotted a fish? Our algorithm detects an (almost) empty photo.

We understand that you want to press the Fish Doorbell, but uploading empty photos burdens our servers and slows down the website.

If you do see a fish in the photo, you can still upload it:

Thanks! The fish are happy, and maybe your photo will become the fish photo of the week.

Curious to see which other fish have been spotted?

In the past hour %count% photos have been submitted, on average it took ⏱️ %average_time% before spotting a 🐟 fish.

%mc_country% is watching in big numbers (%mc_country_perc%), %mc_city% is the city viewing champion 🏆
On average, %average_viewers% eyes are on the stream 👀

According to viewers, %mc_fish% was spotted most 🎏 %mc_fish_count% people reported seeing this fish 🐠✨

Data visualisation 🐟

Every time someone presses the fish doorbell, we collect data completely anonymously. Every hour, we update the latest information here. That way, you’ll always stay up to date with what’s happening underwater! 🐟📊

Data bijgewerkt op: %last_updated%

Fish Doorbell News

More episodes

23/04/2026

Week 8 – First big carp and more pike

A new Fishdoorbell News Report is online! We see the first big carp of this year! And more pike swam by. I’ll tell you all about water insects and how they keep the water clean and healthy.  

In the Fish Doorbell News, I’ll keep you updated every week with the most exciting sightings. I’ll also tell you more about the underwater world. Tune in, watch along and download the questionnaire!

https://youtu.be/https://youtu.be/nYjCK6DWtoc

Have you spotted these fish?

Why we help the fish

What a picture!

Fish Photos of the Week

April 5, 2026 8:08 am
April 12, 2026 5:12 pm
April 12, 2026 12:58 pm
April 12, 2026 7:54 am
April 21, 2026 8:29 am
April 21, 2026 6:53 am
April 20, 2026 7:51 pm
More fish pictures in the gallery

The World’s First Fish Doorbell

Every spring, thousands of fish swim through the Oudegracht in Utrecht, searching for a place upstream to lay their eggs. But the Weerdsluis is often closed. You can help the fish continue their journey! If you see a fish, press the doorbell. This alerts the lock operator to open the lock.

Want to learn more about the Fish Doorbell, how it all started, and who is involved?

About the Fish Doorbell

Just missed a fish?

3 tips for spotting fish

Look in the morning or evening

Most fish are active at dawn or dusk.

Choose the right time of year

The first fish appear in March, but the migration really picks up from early April.

Spot the special species

Eel and zander are mostly spotted at night (if you’re lucky!).

Blub!

Want to learn more about fish and underwater nature? Check out our Fish Doorbell lessons, specially designed for grades 5 to 8

Go to the fish
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