A fish fight.

PositionWater-quality monitoring system - Brief article

San Francisco is using fish in the war on terror. A new water-quality monitoring system automatically analyzes the behavior of eight to 12 bluegills in a tank at a Public Utilities Commission's water-treatment plant. If the computers sense the fish are upset (flexing their gills more often) by something in the water "the system immediately triggers water samples to be taken, and the...

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