fish population

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A school of European Perch swim past a Fish Doorbell camera in the Weerdsluis in Utrecht. 7 June 2023
BusinessTechNature
Utrecht’s fish doorbell returns March 2 to help migrating fish
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A school of European Perch swim past a Fish Doorbell camera in the Weerdsluis in Utrecht. 7 June 2023
TechNatureScience
Millions tune in as Utrecht’s fish doorbell goes live for fifth year