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Fish Doorbell Helps 20 Species Navigate Utrecht Waterways

3/22/2026

24 4 Full Breakdown

Summary

Story summary

In the Netherlands, migrating freshwater fish use a 'fish doorbell' via an underwater camera on Visdeurbel to navigate Utrecht waterways.
The system enables nearly 20 species, including perch and catfish, to pass through the Weerdsluis gate in Utrecht with help from viewers, per the 2026 Fish Doorbell Report.
The gate is normally closed to boat traffic, disrupting migration, but viewers can alert operators to open it when fish appear.

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Story summary

In the Netherlands, migrating freshwater fish use a 'fish doorbell' via an underwater camera on Visdeurbel to navigate Utrecht waterways.
The system enables nearly 20 species, including perch and catfish, to pass through the Weerdsluis gate in Utrecht with help from viewers, per the 2026 Fish Doorbell Report.
The gate is normally closed to boat traffic, disrupting migration, but viewers can alert operators to open it when fish appear.