The Associated Press: WHITE HOUSE NOTEBOOK: No dead fish means water OK

The Associated Press: WHITE HOUSE NOTEBOOK: No dead fish means water OK: "SEOUL, South Korea (AP) — Dead fish tell no tales — unless they're the goldfish being used to monitor water quality at the conference center where President Barack Obama and other world leaders met Friday to hash out global economic policy.
Hosts of the Group of 20 economic summit have released six goldfish into the convention center's water supply. The goal is to make sure the recycled water piped into restrooms is safe from any toxic attack by North Korean agents.
Any fish that go belly-up would signal possible water contamination."