Save Your Pennies: Copper Blocks Fish Sense

July 6, 2013 6:13 PM

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Save Your Pennies: Copper Blocks Fish Sense

When Frank Sinatra threw “three coins in a fountain,” Old Blue Eyes may have endangered fish swimming in those waters. In an experiment, copper-contaminated waters blocked fishes’ ability to smell the odor released by other fish when in danger.

However, people willing to spend a bit more on their wishes don’t stifle fishes’ senses. The metal nickel didn’t seem to block the detection of danger signaling scents released by fish during a predator attack.

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