Dutch Citizens are Using a "Doorbell" to Help Fish Pass Through Canal Gate

Dutch Citizens are Using a “Doorbell” to Help Fish Pass Through the Canal Gate
Visdeurbel
Tasked with helping ensure Utrecht’s canals remain full of life, and convincing everyone it wasn’t an April Fools’ Day joke, two ecologists in the Dutch city have invented the world’s first “fish doorbell.”
An underwater, live-streaming camera at the “Weerdsluis” lock door allows residents to ring a virtual doorbell heard by the local lock keeper when they see that fish are trying to get through.
A lock is a gate that raises or lowers canal boats into different levels of water separated by two doors, and a sluice is a small fish-sized door that allows water (and fish) to pass between them.

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