I suspect the neighbor got rid of her excess fish each fall by putting them in the
drainage pond, because about two or three years ago it began to be
carpeted in goldfish.

It is amazing that all the US hasn't done what Maine has and outlawed the
common goldfish because of this. At the Demo.Pond we often get the
offerings of the fish dumpers. People dump cats & dogs, so I'm not
surprised they dump fish. There was once an article in our paper showing
one of the treatment plants holding tanks full of those that had been
flushed down the toilets, swimming merrily. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us