Mark van Heukelum
Urban ecologist focused on how wildlife navigates city environments, known for creating the Utrecht 'fish doorbell' livestream project to help migrating fish pass city locks.
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Mar 4, 2026 • 12min
The Fish Doorbell of Utrecht
Mark van Heukelum, an urban ecologist who studies how wildlife navigates cities and invented Utrecht’s livestreamed “fish doorbell.” He explains how migrating fish get trapped by city locks and the quirky idea to alert a lockkeeper. The story covers designing the camera and tech hurdles, then a surprising viral response that helped free fish and raised awareness.
