I remember a school trip to the water treatment plant of the city of Antwerp some 20 odd years ago where they also used trouts to guard against contaminants. The trouts had to swim up an artificially created stream in a fish tank. Whenever two of the three trouts made contact with the back of the tank more than a predefined number of times per hour, the system went into a state of alert.
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I slide to unlock my wife. Now searching the attic for my Betamax home videos so I can demonstrate prior art.
I remember a school trip to the water treatment plant of the city of Antwerp some 20 odd years ago where they also used trouts to guard against contaminants. The trouts had to swim up an artificially created stream in a fish tank. Whenever two of the three trouts made contact with the back of the tank more than a predefined number of times per hour, the system went into a state of alert.