Undated photo of a perch fish at a river lock in the central Dutch city of Utrecht, Netherlands, where a ‘fish doorbell’ was installed that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds. — Visdeurbel via AP
UTRECHT, Netherlands: The central Dutch city of Utrecht has installed a "fish doorbell” on a river lock that lets viewers of an online livestream alert authorities to fish being held up as they make their springtime migration to shallow spawning grounds.
The idea is simple: An underwater camera at Utrecht's Weerdsluis lock sends live footage to a website. When somebody watching the site sees a fish, they can click a button that sends a screenshot to organisers. When they see enough fish, they alert a water worker who opens the lock to let the fish swim through.
