By Andrew Williams •
March 19, 2009

A team of UK scientists have developed a shoal of robotic fish, which will soon be released into the sea to detect water pollution.
The robots (video), shaped like Carp, will be set free off the coast of Gijon in northern Spain. If the trial proves successful, the fish could be used in rivers, lakes and seas across the world.
By Kelli Best-Oliver •
August 27, 2008
I can see the Freecycle post now:
OFFER: I have six million carp, good condition. Nothing wrong with them; just have more than I need. You must pick up.
The State of Utah might just be posting like this something soon. Apparently, they’re in the market to unload a few carp–approximately six million–that are tearing up the bottom of Utah Lake, destroying habitat for an endangered species.