Electrodes sense "bioelectronic signals" emitted whenever the fish inhale through their gills. The information is fed into a computer programmed to recognise their normal respiration rates.
A screen displays the information. If the computer ever detects that at least five fish - a majority of those on guard - are breathing abnormally and are in distress, it will automatically trigger an alarm and order gates to close, shutting off the flow in canals carrying water to Sydney.
Sink or swim: eight fish who guard the health of millions
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