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uyouthe
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Here in Saint Petersburg, Russia, our local governmental utility company that is responsible for providing tap water for the entire city, uses crayfish to monitor the water composition.

There are some crayfishes living at the plant and there are some scientists that constantly monitor the crayfish via optical fiber to measure how they feel. If crayfish feels bad, the water is cut out and the inspection begins. There are operators that are paid to watch for crayfish mood throughout the day.

This system works flawlessly since 2005 and helped prevent several accidents when toxic stuff that can’t be monitored on a large scale ended up in our local river.

I mean coal miners was using canaries and rats for years to detect what detectors just can’t detect good enough.

Our entire tap water system depends on some crayfish and it’s amazing.

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