In niederländischem Utrecht haben sie eine Fischtürklingel.
Every spring, fish swim right through Utrecht, looking for a place to spawn and reproduce. Some swim all the way to Germany. There is a problem, however: they often have to wait a long time at the Weerdsluis lock on the west side of the inner city, as the lock rarely opens in spring. We have come up with a solution: the fish doorbell! An underwater camera has been set up at the lock, and the live feed is streamed to the homepage. If you see a fish, press the digital fish doorbell. The lock operator is sent a signal and can open the lock if there are enough fish. Now you can help fish make it through the canals of Utrecht.
How it works
Pressing the fish doorbell notifies the lock operator that there are fish waiting to pass. The operator can decide whether or not to open the lock. The lock seldom opens in spring, but can now be opened daily, if necessary. The fish doorbell allows us to work together to ensure that fish do not have to wait as long at the Weerdsluis lock. This is good news, because it means they are less likely to be eaten by other animals, such as grebes and cormorants.
(via MeFi)
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