Fish doorbell

A fish doorbell (Dutch: visdeurbel) is a system that allows fish to pass through a closed sluice gate through crowdsourced input when fish are present. The Utrecht Visdeurbel uses a livestreamed underwater camera that allows users to press a doorbell button to notify the lock operator that there are fish swimming in the gracht, and that the lock should be opened.[1] It is designed to aid in seasonal fish migration,[2] as an alternative to a physical fish ladder.

Usage

It was deployed for the first time in Utrecht in March 2021,[3][4][5][6] at the Weerdsluis on the Oudegracht. In the first two weeks, it was used 23,000 times.[7] It was disabled in June,[8] but has since been reinstated at visdeurbel.nl.

References

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